National Repository of Grey Literature 69 records found  beginprevious45 - 54nextend  jump to record: Search took 0.00 seconds. 
Development of testing equipment for measuring mechanical properties of cancellous bone
Jiroušek, Ondřej ; Jírová, Jitka ; Vavřík, Daniel
Development of experimental procedures used for evaluation of mechanical properties of cancellous bone using small samples of cylindrical shape. Both the compressive and tensile specimens are tested while for the strain measurement an optical method utilizing CCD camera of high resolution is used. The procedure is used to assess the relationship between the apparent density of the cancellous bone in Hounsfield units obtained from computer tomography scans and viscoelastic material properties used in finite element modeling of whole bones.
Non destructive observation of damage processes by X-Ray dynamic defectoscopy
Vavřík, Daniel ; Jakůbek, J. ; Pospíšil, S. ; Visschers, J. ; Zemánková, Jaroslava
The subject of this work is experimental observation of the development of internal damage and its evolution in aluminium alloy flat specimens with different configurations of the pre crack. We propose direct and non-destructive observation of the material damage evolution by measuring changes in transmission of X-rays penetrating a stressed material, using a single photon counting X-ray imager, called Medipix 1.
Experimental determination of stress-strain dependence of non-standard materials
Vavřík, Daniel ; Drdácký, Miloš
The subject of this work is experimental determination of mechanical properties for different types of animal hairs. Mortars reinforced by thin fibres have promising properties for application in cultural heritage protection. Theoretical research is based on mathematical modeling of composite materials with inorganic (brittle) matrix and differential types of reinforcement fibres - natural as well as man made polymeric fibres. For these models, knowledge of mechanical properties of the fibres is needed. Optical method developed especially from this purpose will be introduced in this paper.
Resolution and stability tests of Medipix-1 pixel detector for X-ray dynamic defectoscopy
Jakubek, J. ; Vavřík, Daniel ; Pospíšil, S. ; Visschers, J.
The application of the Medipix-1 pixel detector device for directnondestructive observation of damage development in graduallystressed materials by means of X-ray transmission measurements(so called X-Ray Dynamic Defectoscopy -XRDD) has been recentlysuccessfully demonstrated.
Experimental Methods Used for Verification of theComputational Model of Silicon Rubber Implant
Kult, J. ; Vavřík, Daniel
The contribution from the field of biomechanics reportson a complex analysis of Swanson's prosthesis ofinterphalangeal joint and its interaction with phalangealand metacarpal bone.
Optical Determination of Constitutive Equations Parametersof Nonlinear Materials
Vavřík, Daniel ; Korouš, Jan ; Zemánková, Jaroslava ; Jaroš, P.
The paper presents simple optical experimental method fordetermination of constitutive equations parameters ofnonlinear materials. Usually only one extensometer orstrain gauge is used for the determination of strain inloading direction and one for the determination of acontraction in standard tensile test.
Experimental and numerical determination of the parametersof the Gurson model for ductile fracture
Laš, V. ; Řehounek, L. ; Vavřík, Daniel
The paper presents results of numerical fit of axisymmetricFE model utilizing the modified Gurson model into experimentalmeasurements of tensile strain and contraction evolutions ofnotched bars. This model combines plasticity and damage by intro-ducing porosity of a material in order to predict final fracture.
Numerical an Experimental Analysis of Plastic Deformation in the Vicinity of the Crack Tip
Laš, V. ; Vavřík, Daniel ; Zemčík, R.
In the first section the rate of strain energy under loading of a crack specimen is discussed, followed by a discussion of numerical analysis of plastic fields in the vicinity of the crack tip and finally comparison with an experiment carried out by an optical method of deformed circles.
ST2D - Software for Determination of Total Strains on a Surface
Vavřík, Daniel
The new optical method of the total strains zone shape and size identification on a surface named "Method of Deformed Circles" was developed in ITAM CAS. Method is based on the optical observations of deformations of hexagonal grid on the specimen surface. Related software ST2D on Windows platform can determine field of strains, stress and energy.

National Repository of Grey Literature : 69 records found   beginprevious45 - 54nextend  jump to record:
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2 Vavřík, David
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