- Type of paper
: Paper in book
Title: Strain Measurement
- Authors:
- Heidl, Ivan
- Husnjak, Mirko (75424)
Publisher: Leksikografski zavod Miroslav Krleža
ISBN: 86-7053-026-0
Year: 1992
Pages: from 685 to 690
Language: hrvatski
Summary: A wide variety of mechanical, electrical, and optical
systemshave been
developed for measuring the average strain at a point on asurface. The
method in widest use employs the bonded electric wire or foilresistance
strain gages. In this article a brief survey of the method isdescribed.
Methods employed in residual stress measurements are described ina
second part of this paper, and third part is dealing withphotoelastic
strain
gages.
Keywords: strain measurement, stress measurement, strain gage, electric resistance strain gages, residual stress measurement, photoelastic strain gages.
- Type of paper
: Paper in book
Title: Theory of Elasticity
- Authors:
- Jecić, Stjepan
Publisher: Leksikografski zavod Miroslav Krleža
ISBN: 86-7053-026-0
Year: 1992
Pages: from 690 to 701
Language: hrvatski
Summary: The paper contains a modern course in the theory of
elasticity.Equations a given in usual and tensor notation. Such an
appoachhelps in concentrating the attention on the basic question intheory
of elasticity.
Keywords: mechanic of solid bodies, stresses, displacements, strains, Hooke's low, equilibrium equations, equations of strain compatibility, Airy's functions
- Type of paper
: Paper in proceedings
Title: An analysis of the singular shape of caustics for
mechanically orthoropic materials
- Authors:
- Semenski, Damir (121105)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: Zbornik radova Fakulteta strojarstva i brodogradnje XVI
Language: hrvatski
Place: Zagreb
Year: 1992
ISBN/ISSN: 0350-3097
Pages: from 19 to 27
Summary: The paper presents the idea of the application of optical
methodof caustics in the field of fracture mechanics of
mechanicallyanisotropic (ortthotropic) materials. The original purpose
ofthis method is experimental determination of stress intensityfactor. The
analysis of the shape of optical effect is given forthe mode I crack
opening, where the crack is directed to one oftwo principal axes of
orthotropy. As the shape of singularcaustic curve s depends upon the
elastic characteristics ofmaterials, the results are given fot typical
orthotropicmaterial. Only the valuse of two Poisson's ratios are
variedbecause of their problematic experimental determination.
Keywords: Experimental mechanics, Caustic method, Fracture mechanics, Mechanically orthotropic materials
Other: UDK 539.375
- Type of paper
: Paper in proceedings
Title: Some solutions for the shapes of caustics in the fracture
mechanics of orthotropic materials
- Authors:
- Semenski, Damir (121105)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: Zbornik radova Fakulteta strojarstva i brodogradnje XVII
Language: hrvatski
Place: Zagreb
Year: 1993
ISBN/ISSN: 0350-3097
Pages: from 23 to 29
Summary: The stress distribution around the crack-tip sepends upon
themechanical properties of the mechanically orthotropic materials.The
presented analysis of the shapes of caustics for the mode Ithe crack
opening shows the influence of mechanicalcharacteristics and the crack
orientation depending on the shapeof the caustic curve. The solution cannot
be given in generalform and the calculation is to be attained for each
materialseparately as the condition required for the properinterpretation
of the experimental results.
Keywords: Experimental mechanics, Caustic method, Fracture mechanics, Mechanics of orthotropic materials
Other: UDK 539.375
- Type of paper
: Paper in proceedings
Title: Some incorectnesses in stress concentration factors
determination
- Authors:
- Kodvanj, Janoš (152374)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: Zbornik radova Fakulteta strojarstva i brodogradnje XVI
Language: hrvatski
Place: Zagreb
Year: 1992
ISBN/ISSN: 0350-3097
Pages: from 37 to 43
Summary: The diagrams of stress concentration factors instead of
thecommon way of presentation, can be shown in the special kind
ofcoordinate system as linear characteristics. This method hasseveral
advantages in practical use for the determination ofstress concentration
factors of new designed shapes. For somediagrams well known from the
literature, the deviations from thelinear characteristics have been
detected. The results for thesecases are corrected and the reliable linear
characteristics arepresented in this paper.
Keywords: Experimental mechanics, Photoelasticity, Stress concentration factor, Linear characteristic
Other: UDK 620.171.5
- Type of paper
: Paper in proceedings
Title: Thermoelasticity in photoelasticity
- Authors:
- Jecić, Stjepan
- Krpanec, Gordan (187114)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: ZBORNIK RADOVA FSB XVII
Language: hrvatski
Place: Zagreb
Year: 1993
ISBN/ISSN: 0350-3097
Pages: from 7 to 14
Summary: Starting from the thermoelasticity presumptions
anequation has been set. It connects the sum of principal stresseson the
body surface with the exit signal of thermographicequipment (the main
equation of thermographic stress analysis).On the basis of a specific
expression for parameter K,thermoelastic effect for steel and aluminium as
well asphotoelastic materials Araldit B and Makrolon has been analyzedin
order to establish the appropriateness of these materials inthe
experimental determination of stresses, along with thepossibility to apply
hybrid method in which stress patternanalysis by thermal emission would be
applied simultaneously withthe photoelasticity analysis with the aim to
solve the problem ofprincipal stress separation.
Keywords: SPATE, parameter K, the main equation of thermographic stress analysis, hybrid method
- Type of paper
: Paper in proceedings
Title: Thermoelasticity in experimental stress analizing
- Authors:
- Jecić, Stjepan
- Krpanec, Gordan (187114)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: ZBORNIK RADOVA FSB XVI
Language: hrvatski
Place: Zagreb
Year: 1992
ISBN/ISSN: 0350-3097
Pages: from 11 to 18
Summary: Expressions for Helmholtz_s free energy and entropy
duringdeformation of linear-elastic body are derived from assumptionsof
thermoelasticity. From the basepoint of these expressionsequation which
connects the first stress invariant with change oftemperature in any point
of the body is derived. For the pointson the surface of the body the
equation is adapted intoexpression which connects the sum of principal
stresses with exitsignal of thermographic equipment (main equation of
thermographicstress analysis).
Keywords: thermoelasticity, Helmholtz's free energy, entropy, the main equation of thermographic stress analysis
- Type of paper
: Paper in proceedings
Title: Application of Makrolon in Photoelasticity
- Authors:
- Jecić, Stjepan
- Krpanec, Gordan (187114)
- Gomerčić, Mladen (187050)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: ZBORNIK RADOVA FSB XVII
Language: hrvatski
Place: Zagreb
Year: 1993
ISBN/ISSN: 0350-3097
Pages: from 15 to 22
Summary: This paper analyses the qualities of Makrolon,
apolycarbonate produced by the German company Bayer. The basicphysical and
chemical qualities of this material as well as thecriteria according to
which the application of the material isevaluated in photoelasticity are
given at the beginning of thepaper. The description of the experiments made
in order to definethe characteristics of the material and check the data
quoted inthe bibliography follow after this. The obtained results
arepresented by means of diagrams and tables.
Keywords: Experimental mechanics, photoelasticity, photoelastic materijal, polycarbonate, Makrolon
- Type of paper
: Paper in proceedings
Title: Principles of Crack-tip Mixed Mode Caustics in
Mechanically Anisotropic Materials
- Authors:
- Jecić, Stjepan
- Semenski, Damir (121105)
- Bilušić, Zrinka
- Editors
- Sorić, Jurica
- Vranković, Nikola
Proceedings title: Zbornik radova 1. kongresa Hrvatskog društva za mehaniku
Language: engleski
Place: Pula
Year: 1994
ISBN/ISSN: 953-96243-0-4
Pages: from 455 to 462
Meeting: 1. Kongres Hrvatskog društva za mehaniku
Held: from 09/14/94 to 09/17/94
Summary: This paper focuses on the theoretical development of the
method of caustics and its application to mechanically anisotropic
materials. The presented analysis of the shape of the optical effects for
mixed I and II mode crack-opening shows the influence of mechanical
characteristics to the shape of caustic curves. The solutions cannot be
given in the general form and the numerical simulations of the experiments
are necessary for each situation. The experimentation is performed in order
to determine the stress intensity factors KI and KII by evaluation of
caustics, automatically recorded by image scanner and digitized in the
adapted form for data processing.
Keywords: method of caustics, fracture mechanics, mechanicallz anisotropic materials
- Type of paper
: Paper in proceedings
Title: Analysis of Photographed Caustics of Mechanically
Anisotropic Materials
- Authors:
- Semenski, Damir (121105)
- Editors
- Smolčić-Žerdik, Zora
Proceedings title: Zbornik radova Fakulteta strojarstva i brodogradnje XVIII
Language: hrvatski
Place: Zagreb
Year: 1994
ISBN/ISSN: 1330-4364
Pages: from 29 to 35
Summary: When investigating crack-tip stress intensity factors the
result of caustic experiment is a dark spot surrounded by the bright light
area. The shape of the singular caustic curve at the boundary between light
and dark zone has to be analyzed by considering the theoretical solution,
strongly dependent on the position of the crack, loading conditions and
mechanical characteristics of the specified material. The presented
interactive multi-point over-deterministic data reduction method is very
convenient for the application to mixed-mode crack opening where the
iterative procedure gives much mor reliable results than the classical
diameter measuring technique.
- Type of paper
: Paper in proceedings
Title: Application of Fracture Mechanics in Creating Aceptance
Criteria
- Authors:
- Semenski, Damir (121105)
- Alfirević, Izidor
- Editors
- Krstelj, Vjera
Proceedings title: Zbornik radova Međunarodnog savjetovanja KBR U SUSTAVU KVALITETE
Language: hrvatski
Place: Opatija
Year: 1994
ISBN/ISSN: 953-96225-0-6
Pages: from 107 to 114
Meeting: Međunarodno savjetovanje KBR SUSTAVU KVALITETE
Held: from 06/16/94 to 06/17/94
Summary: Importance of the fracture mechanics approach to the
assessment of a critical crack size is pointed out. Based of acceptance
criteria, a procedure for evaluating the critical defect in a structure is
given. Certain drawbacks of such approach are eliminated by direct
measuring of the stress intensity factor K. To determine this factor
optical method of caustics is suggested.
Keywords: quality control, fracture mechanics, caustic
- Type of paper
: Summary in proceedings
Title: The shape of caustics for mode I crack opening on
graphite-epoxy material with unidirectional fibers
- Authors:
- Semenski, Damir (121105)
Proceedings title: Proceedings of the 8th Danubia-Adria Symposium
Language: engleski
Place: Godollo, Mađarska
Year: 1991
Pages: from 6 to 7
Meeting: 8th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 10/11/91 to 10/12/91
Summary: The shadow optical method of caustics is well known
inexperimental fracture mechanics as a merhod for stress-intensityfactor
determination in mechanically isotropic materials. Theshape of caustics for
mode I crack opening is of the epicycloidalform for this kind of materal.
The theoretical solution of theshape of caustics for mechanically
orthotropic material indicatethat the shape is a strong function of the
properties in variousorientation. This is experimentally confirmed on 8
layersGraphite-Epoxy material with the fibers in one direction.
Themechanical properties of the material are extremly different inthe two
of principal direction and very representative fororthotrpic case. Since
the size of the fiber is of the under of0.001mm and very closely spaced,
the material represents amechanically orthotropic material not only
macroscopically butalso near the crack zone. These very first rewsults can
providethe future use of the method of caustics for measuring the
stressintensity factor as a function of applied load in all kinds
ofmechanically orthotropic materials.
Keywords: Experimental mechanics, Caustic method, Fracture mechanics, Stress-intensity factor, Orthotropic materials
- Type of paper
: Summary in proceedings
Title: The shapes of caustics for different characteristics of
mechanically orthotropic materials
- Authors:
- Semenski, Damir (121105)
- Jecić, Stjepan
Proceedings title: Proceedings of 9th Danubia-Adria Symposium
Language: engleski
Place: Trst, Italija
Year: 1992
ISBN/ISSN: 0350-3097
Pages: from 41 to 42
Meeting: 9th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 10/01/92 to 10/03/92
Summary: The basic stress equation for mode I crack opening is
dependableupon the mechanical prpperties of the mechanically
orthotropicmaterials. The stress distribution is also different for
thedifferent crack orientation in view of principal axes oforthotropy. It
is also to expect the different values of stressintensity factors for those
cases. The analysis of the method ofcaustics, applied for mechanically
anisotroŠpic materials, showsthe influence of mechanical characteristics
and the crackorientation on the shape of the caustic curve. In KI
measuringprocess, the size of the dark spot will be compared to unit
one,analitically obtained. The different types of the caustic curvesare
calculated on the basis of analytical solution for thedifferent mechanical
characterstistics. First of all, the ratioof Youngs mooduli E1/E2 is
varied, while for others cases thisratio is given as a constant value. The
crack orientation isgiven for the real graphite-epoxy compsite material.
The realoptical effect is obtained for the crack orientation into
thedirection of principal axes of orthotropy. The analysis ofcaustic shape
is terefore of importance for the properexplanation of the experimental
effect in the process ofinterpretation of the experimental results.
Keywords: Experimental mechanics, Caustic method, Fracture mechanics, Stress-intensity factor, Orthotropic materials
- Type of paper
: Summary in proceedings
Title: Advanced computer-aided evaluation of caustics for cracs
in mechanically anisotropic materials
- Authors:
- Semenski, Damir (121105)
- Rossmanith, Hans Peter
- Knasmillner, Rudolf Ernest
Proceedings title: Proceedings of 10th Danubia-Adria Symposium
Language: engleski
Place: Prag, Češka Republika
Year: 1993
Pages: from 103 to 104
Meeting: 10th Danubia-Adria Symposium on Experimental methods in Solid Mechanics
Held: from 09/30/93 to 10/02/93
Summary: In the past the method of caustics has been developed as a
suitable tool for the evaluation of stress intensity factors in fracture
mechanics. When investigating crack tip stress intensity factors the result
of a caustic experiment is either one or a sequence of shadow spots, the
shape and the diameter of which are indicative of the stress intensity.
Previously, SIF-values have been determined from caustics diameter
measurements. A new technique for the SIF's determination has been designed
on the basis of interactive computer graphics and a multi-point
over-deterministic data reduction method. The squares of the distances
between conjugated experimental data points and the best-fit theoretical
caustic is minimized on the basis of a least squares technique. For
mechanically isotropic materials this method was shown to work very fast
and reliable and the results converge very rapidly. The method is
successfully applied to mechanically anisotropic materials of which the
orthotropic materials form a very important special case where the
theoretical solutions for the positions of the light beams and for the
singular caustic curve are taken into the account. The large number of data
points that are employed in the analysis make this method a much reliable
one when compared to the classical - diameter measuring technique, which
would fail to work in the case of general mixed - mode loading conditions
or at bimaterial interfaces.
Keywords: fracture mechanics, optical method of caustics, stress intensity factor, measuring techniques, anisotropic material
- Type of paper
: Summary in proceedings
Title: The Influence of a Temperature on the Photoelastic Effect
Fixated by Means of Gamma-ray-irradiation
- Authors:
- Kodvanj, Janoš (152374)
- Gomerčić, Mladen (187050)
Proceedings title: Proceedings of 9th Danubia-Adria Symposium
Language: engleski
Place: Trst, Italija
Year: 1992
Pages: from 47 to 48
Meeting: 9th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 10/01/92 to 10/03/92
Summary: The basic principles of gamma-rays-irradiation method are
presented in the paper. This method, which is used for fixation of
photoelastic effect in three-dimensional stress analysis, has several
advantages as opposed to classical freezing method. These advantages become
obvious especially in the investigations of contact and thermal stresses.
The influence of the model temperature on the level of fixed photoelastic
effect has been observed and found significant for the experimental
results.
Keywords: Eksperimental mechanics, photoelasticity, gamma-rays-irradiation method, 3D problems
- Type of paper
: Summary in proceedings
Title: On some fundamental solutions of stress concentrations
- Authors:
- Jecić, Stjepan
- Kodvanj, Janoš (152374)
Proceedings title: Proceedings of 8th Danubia-Adria Symposium
Language: engleski
Place: Godollo, Mađarska
Year: 1991
Pages: from 15 to 16
Meeting: 8th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 10/11/91 to 10/12/91
Summary: The deviation from the linear characteristics of the
stressconcentration factor diagram known from the literature shows in
anumber of basic elements of structures that the stressconcentration was
not determined correctly. Systematicinvestigations of such cases have been
made and a new diagramflow established. The experiments were made upon
photoelasticmodel while numerical calculations were carried out by means
ofthe finite elements method.
Keywords: Experimental mechanics, Photoelasticity, Stress concentration, Linear characteristic
- Type of paper
: Summary in proceedings
Title: Making the choice on model materials and the temperature
resolution of equipement for stress pattern analysis by thermal emission
- Authors:
- Jecić, Stjepan
- Krpanec, Gordan (187114)
Proceedings title: PROCEEDINGS the 9th DANUBIA-ADRIA SYMPOSIUM
Language: engleski
Place: Trst, Italija
Year: 1992
Pages: from 91 to 92
Meeting: 9th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 10/01/92 to 10/03/92
Summary: Expressions for Helmholtz_s free energy and entropy
duringdeformation of linear-elastic body are derived from assumptionsof
thermoelasticity. From the basepoint of these expressionsequation which
connects the first stress invariant with change oftemperature in any point
of the body is derived. For the pointson the surface of the body the
equation is adapted intoexpression which connects the sum of principal
stresses with exitsignal of thermographic equipment (main equation of
thermographicstress analysis). On the bases of certain expressions for K
and Cintensity of thermoelastic effect is analyzed, as well as choiceof
model material and temperature resolution of equipment forstress pattern
analysis by thermal emission.
Keywords: thermoelastic effect, SPATE, parameter K, the temperature resolution of the thermographic equipement
- Type of paper
: Summary in proceedings
Title: Thermoelasticity in Photoelasticity
- Authors:
- Jecić, Stjepan
- Krpanec, Gordan (187114)
Language: engleski
Place: London, Engleska
Year: 1993
Pages: from 0 to 0
Meeting: PHOTOELASTICITY-New Instrumentation, Materials and Data Processing Techniques
Held: from 11/24/93 to 11/25/93
Summary: Starting from the thermoelasticity presumptions an
equationhas been set. It connects the sum of principal stresses on thebody
surface with the exit signal of thermographic equipment (themain equation
of thermographic stress analysis). On the basis ofa specific expression for
parameter K, thermoelastic effect forsteel and aluminium as well as
photoelastic materials Araldit Band Makrolon has been analysed in order to
establish theappropriateness of these materials for the
experimentaldetermination for stresses, along with the possibility
ofintroducing hybrid method in which stress pattern analysis bythermal
emission would be applied simultaneously with thephotoelasticity analysis
with the aim to solve the problem ofprincipal stress separation.
Keywords: SPATE, photoelasticity, parameter K, Makrolon, Araldit B, hybrid method
- Type of paper
: Summary in proceedings
Title: Caustic and photoelasticity in experimental determination
of stress-intensity factors in 3-D bodies
- Authors:
- Semenski, Damir (121105)
Proceedings title: 8th DANUBIA - ADRIA SYMPOSIUM
Language: engleski
Place: Godollo, Mađarska
Year: 1991
Pages: from 31 to 32
Meeting: 8th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 10/11/91 to 10/12/91
Summary: The optical method of caustic has been used in two
dimensionalanalusis in both statics and dynamic problems. For
threedimensional experimental investigation of stress intensityfactors this
method is quite unsuitable. This paper shows amodification of caustic
technique in stress intensitydetermination in 3-D crack problems.
Keywords: caustics, cracks, stress intensity factors, 3D stress freezing technique
- Type of paper
: Summary in proceedings
Title: Application of Makrolon in Experimental Stress Analysis
- Authors:
- Jecić, Stjepan
- Krpanec, Gordan (187114)
- Gomerčić, Mladen (187050)
Proceedings title: Proceedings of 11 Danubia-Adria Symposium
Language: engleski
Place: Baden/Beč, Austrija
Year: 1994
Pages: from 47 to 48
Meeting: 11th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 09/29/94 to 10/01/94
Summary: This paper presents mechanical, optical and
thermoelastic properties of the polycarbonate Makrolon obtained by recent
measurements. The results show a departure from the data given in previous
works. The results will serve a basis for further application of the
polycarbonate in photoelasticity and SPATE (Stress Pattern Analysis by
Thermal Emission).
Keywords: Makrolon, polycarbonate, photoelasticity, SPATE, experimental stress analysis
- Type of paper
: Summary in proceedings
Title: Caustics in Graphite Fibre-reinforced Materials
- Authors:
- Semenski, Damir (121105)
Proceedings title: Proceedings of 11th Danubia Adria Symposium
Language: engleski
Place: Baden/Beč, Austrija
Year: 1994
Pages: from 161 to 162
Meeting: 11th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics
Held: from 09/29/94 to 10/01/94
Summary: Theoretical approach to the optical effect of the
mechanically anisotropic materials is based on the geometrical principles
of the reflected light beams deflections from the surface surrounding the
crack-tip. The solution leads to the caustic curves while their shapes
extremely depend upon the mechanical properties of the material and the
position of the crack with respect to the principal axes of orthotropy. The
experimental setup consists of the point light source of high energy,
lenses and CCD camera with AD converter and computer. The program provides
the filtering of the image that is necessary for dark spot boundary
recognition, the foggy blurred zones are extracted from the screen. This
makes possible to use classical diameter measuring technique or advanced
multi-point over-deterministic data reduction method. The mode I crack
opening is analyzed for its importance of the assessment of the life-time
of construction. The simulations of the optical effects are obtained for
different crack orientations. First experimental results, obtained by
experimentations on the five different types of graphite fibre-reinforced
composite materials, match very well to the theoretical ones, so that the
perspective practical use of this method can be predicted in near future.
Keywords: fracture mechanics, optical method of caustics, stress intensity factor, composite material
- Type of paper
: Summary in proceedings
Title: Investigation of Stress Intensity Factors bz Means of
Caustics in Mechanically Anisotropic Materials
- Authors:
- Jecić, Stjepan
- Semenski, Damir (121105)
Proceedings title: Preceedings of Euromech Colloquium 334 Textile Composites and Textile Structures
Language: engleski
Place: Lyon, Francuska
Year: 1995
Meeting: Euromech Colloquium 334 Textile Composites and Textile Structures
Held: from 05/15/95 to 05/17/95
Summary: The experimental determination of the stress intensity
factors K by the optical method of caustics is commonly in use for the
mechanically isotropic materials either in transparent or non transparent
light arrangement. The general solution for the shape of caustic curve for
mode I crack opening is of the same epycicloidal form for any kind of
isotropic material. The determination of KI is performed by measuring the
maximum dark spot diameter on the real or virtual image referent plane. The
size of a caustic curve for non transparent materials depends upon the
optical conditions, mechanical characterististics and load intensity
applied to the specimen. This contribution deals with the application of
the reflection method of caustics to the non transparent mechanically
anisotropic materials such as fiber reinforced materials, textile
composites etc. By using the analogy of geometrical assumptions for
mechanically isotropic materials, the criterion for determining K factor in
orthotropic materials is proposed and the procedure for its determination
is described. The necessity of the numerical simulations of the optical
effect for the material, treated for each situation separately (position of
the crack, mixed-mode crack opening ratio), is explained by reasons of
proper evaluation of experimental results. The theoretical solution is
confirmed by experimentation on one type of graphite fiber- reinforced
material of extremely different orthotropic properties.
Keywords: mehanika loma, optička metoda kaustike, faktor intenzivnosti naprezanja, anizotropni materijal, kompozitni materijal
- Type of paper
: M.A.
Title: The reasons for nonlinearities of stress concentration
diagrams
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Author: KODVANJ JANOŠ
Date of defense: 07/13/93
Language: hrvatski
Number of pages: 115
Summary: The method of linearization of stress
concentrationfactors, which enables the presentation of these factors in
amore convenient way is shown in this paper. The possibilities andthe
advantages of this way of linearization are described for thecases where
the curves are the functions of various geometricalcharacteristics of the
construction model.
The existing stress concentration factors diagrams arelinearized for
two- and three-dimensional problems, where thedeviations from the straight
lines are shown in detail. Theerrors are systematized into the
characteristic groups and thepossible causes of their manifestation are
critically considered.
The experiments are performed on three different planespecimens where
the verification of the results compared to thosepreviously known from the
literature shows a significantdifference and confirms the linearization.
The stress freezingmethod is used for the investigation of the specimen
thicknessinfluence on the stress concentration factors. The obtainedresults
decline the dilemma about the assumption of the three-
dimensional state stresses in the construction elements such asplates and
beams. The linearized stress concentration factorsdiagrams, given at the
end of this paper, are very important forthe strength calculations in
different two- and three-dimensional
construction elements.
Keywords: Experimantal mechanics, Photoelasticity, Stress freezing method, Stress concentration factor, Linear characteristic
- Type of paper
: M.A.
Title: The Stress and Deformations Analysis by Means of
Stereophotogrammetry
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Author: GOMERČIĆ MLADEN
Date of defense: 03/24/95
Language: hrvatski
Number of pages: 137
Summary: The paper describes the automatic procedure of
stereophotogrametric analysis of three-dimensional displacements and
deformations by means of automatic picture processing. The measurement
principles are explained and the performed experiments are described. Three
dimensional displacements of the points marked on the surface of diaphragm
spring are measured by two recording cameras. The application of bundle
adjust method gives the accuracy around 0.01% of range of measurement. The
application of two-dimensional grating method and compensation of apart
deformations, that proceed as consequence of 3D displacements, shows the
14% relative difference compared to the corresponding deformation of the
spring, described and controlled by photoelastic method. The automatic
digitized picture analysis was found as convenient in stereophotogrametry
for measurement of large displacements and large deformations in 3D
problems.
Keywords: Stereophotogrametry, digital image processing, 3D measurements, displacements, deformations, experimental mechanics.
- Type of paper
: Mentorship
Title: The stress analysis by thermography
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 02/28/91
Number of pages: 86
Author: Dugalić Dipl. inž. Mato
Degree level: D.A.
- Type of paper
: Mentorship
Title: The analysis of stiffness of tool handle
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 02/28/91
Number of pages: 128
Author: Miškulin Dipl. inž. Davor
Degree level: D.A.
- Type of paper
: Mentorship
Title: Photogrammetric stress analysis
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 06/27/91
Number of pages: 81
Author: Gomerčić Mr. sc. Mladen
Degree level: D.A.
- Type of paper
: Mentorship
Title: The influence of stress koncentracion for small radii of
curvature
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 12/20/91
Number of pages: 80
Author: Carić Dipl. inž. Dražen
Degree level: D.A.
- Type of paper
: Mentorship
Title: Stresses in the thick walled pressure vessel
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 02/28/92
Number of pages: 57
Author: Čeović Dipl. inž. Željko
Degree level: D.A.
- Type of paper
: Mentorship
Title: Calculation of complicated beams by the transmited matrix
method
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 05/14/92
Number of pages: 71
Author: Rusev Dipl. inž. Mirjana
Degree level: D.A.
- Type of paper
: Mentorship
Title: Assessment of strength in mechanically orthotropic
constructions
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 05/14/92
Number of pages: 56
Author: Kožul Dipl. inž. Stanko
Degree level: D.A.
- Type of paper
: Mentorship
Title: Strength of the constructions elements under the twisting
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 06/25/92
Number of pages: 66
Author: Knez Dipl. inž. Davor
Degree level: D.A.
- Type of paper
: Mentorship
Title: Stresses in the region of penetration of preasured and
ventil hole of the pump
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 07/14/92
Number of pages: 82
Author: Gojak Dipl. inž. Jadranka
Degree level: D.A.
- Type of paper
: Mentorship
Title: The stress intensity factor determination for
three-dimensional cracks
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 11/20/92
Number of pages: 79
Author: Jelović Dipl. inž. Mario
Degree level: D.A.
- Type of paper
: Mentorship
Title: The stress analysis of thich-walled pipe containing
notches
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 12/18/92
Number of pages: 55
Author: Grgas Dipl. inž. Ratko
Degree level: D.A.
- Type of paper
: Mentorship
Title: The stress analysis in the plate of tool carrier of
hydraulic press
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 12/18/92
Number of pages: 86
Author: Dakić Dipl. inž. Mirjana
Degree level: D.A.
- Type of paper
: Mentorship
Title: Experimental stress analysis in warping tool elements
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 05/14/93
Number of pages: 58
Author: Goja Dipl. inž. Stanislav
Degree level: D.A.
- Type of paper
: Mentorship
Title: Experimental stress analysis around the crack-tip
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 05/14/93
Number of pages: 61
Author: Oreb Dipl. inž. Elido
Degree level: D.A.
- Type of paper
: Mentorship
Title: The stress analysis of welded joint
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 11/18/93
Number of pages: 64
Author: Glumičić Dipl. inž. Nada
Degree level: D.A.
- Type of paper
: Mentorship
Title: The aplication of photoelasticity for determination of
stress concentration factor in gear tooth rooth
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 12/22/93
Number of pages: 63
Author: Ivezić Dipl. inž. Dražen
Degree level: D.A.
- Type of paper
: Mentorship
Title: The application of photoelacticity for stress intensity
factors determinations
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 12/22/93
Number of pages: 74
Author: Oletić Dipl. inž. Zdravko
Degree level: D.A.
- Type of paper
: Mentorship
Title: The application of photoelacticity for stress intensity
factor determination
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 12/22/93
Number of pages: 66
Author: Filković Dipl. inž. Igor
Degree level: D.A.
- Type of paper
: Mentorship
Title: Determination of stress-intensity factors for mixed modes
crack openings
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 02/24/94
Number of pages: 60
Author: Gereci Dipl. inž. Valentina
Degree level: D.A.
- Type of paper
: Mentorship
Title: The influence of the crack to the reliability of the
ventilator blade made of composite material
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 07/05/95
Number of pages: 75
Author: Bilušić Dipl. inž. Zrinka
Degree level: D.A.
- Type of paper
: Mentorship
Title: The reasons for nonlinearities of stress concentration
diagrams
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 07/13/93
Number of pages: 115
Author: Kodvanj Mr. sc. Janoš
Degree level: M.A.
- Type of paper
: Mentorship
Title: Determination of residual stress by using succesive
drilling technique
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 06/20/95
Author: Barle Mr. sc. Jani
Degree level: M.A.
- Type of paper
: Mentorship
Title: The stress and deformations analysis by means of
stereophotogrammetry
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 03/24/95
Number of pages: 137
Author: Gomerčić Mr. sc. Mladen
Degree level: M.A.
- Type of paper
: Mentorship
Title: Crack propagation in orthotropic materials with accent to
wood
Faculty: Fakultet strojarstva i brodogradnje Zagreb
Mentor: JECIĆ STJEPAN
Date of defense: 04/22/92
Number of pages: 95
Author: Dimitrijević Dr. sc. Dragi
Degree level: Ph.D.
- Type of paper
: Invited lecture
Title: The Shapes of Caustics around the Crack-tips in
Orthotropic Materials
Institution: ASESA
Year: 1991
