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	The crack propagation under combined stress with one component constant and second dynamic one Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav One of the aims of fatigue experiments made on tube form steel specimens armed with a lateral hole was to obtain the influence of a static load on fatigue life and a direction of a fatigue propagation under combined stress. The results of tests have revealed that the static stress influences final fatigue life while does not influence the crack direktion. Detailed record
	Hyperelesticita pryžového segmentu při jednoosých tlakových zkouškách Potel, S. ; Pešek, Luděk ; Svoboda, Jaroslav The plane strain model of hyperelastic material was developed in the ANSYS. For this model, hyperelastic behavior of rubber block and identification of Mooney-Rivlin coefficients from real experimental data for uniaxial compression tests are presented. Furthermore rubber-steel contact problem including tangential Coulomb forces with various friction coefficients were solved. This research is aimed at evaluation of material hyperelastic parameters from static tests and for evaluation of stress state of the rubber segments used as resilient elements in railway wheels. hicle. Detailed record
	Behavior of thermo-visco-elastic material 42-809 for production of vibrodamping segments - Part I Svoboda, Jaroslav ; Pešek, Luděk ; Fröhlich, Vladislav ; Vaněk, František ; Klášterka, Petr ; Cibulka, Jan The report deals with the first results of rubber segment properties for vibrodamping of tram wheels. There are presented static and dynamic characteristics of force and deformation, changes of stiffness, temperature and loss factor with respect to number of cycles. In addition the growth of permanent deformation, lost of recovery, relaxation phenomena etc. Detailed record
	Fatigue strength and life of real structures under combined random loading Svoboda, Jaroslav ; Fröhlich, Vladislav ; Kraus, V. An investigation of fatigue strength and life usually joined with experiments, which are made using small testing specimens. This is the reason why majority of numerical methods used for fatigue of materials was derived basing on those experiments under kinds of loading. It is rather difficult to apply these methods for real structures loaded by random combined processes in service. The contribution discusses the problem and shows its complexity on an example. Detailed record
	Curves of equal fatigue lives under combined random stress Svoboda, Jaroslav ; Fröhlich, Vladislav The contribution deals with determining an influence of normal and tangential components of a stress on the total damage under combined random loading in tension-pressure and torsion. An experimental program ran with plain and notched tube specimens made out of low carbon steel ČSN 411523.1. Regression curves were obtained for several rations of standard deviations of the stress components. Basing on the regression curves, curves of equal fatigue lives were constructed. It is possible to use them for calculating asafe life of structures. Detailed record
	A crack propagation in structure parts exposed to a nonproportional multiaxial random loading Svoboda, Jaroslav ; Balda, Miroslav ; Frohlich, Vladislav The contribution deals with activities a goal of which was a testing of a possibility of an applikation of Paris formula in case of a complex loading. The problem was studiedand verified experimentally on tube speciments possesing a lateral hole, which were stressed by a combination of tension-pressure and torque. A rate of the crack propagation velocity has been evaluated for different kinds of random nonproportional loading characterised by the different ratio of normal and shear stress. Detailed record
	The use of energy criterion for computing the fatigue lives of structures stressed by a multiaxial nonproportional random loading Balda, Miroslav ; Svoboda, Jaroslav The originally uniaxial energy criterion has been modified for an multiaxial case introducing a fictive damaging stress as a resultant of a couple of normal stresses as a driving one. The resulting fatigue lives are in an acceptable correlation with those obtained experimentally. A scattering of the experimental data increases with a ratio of tangential and normal stresses. Detailed record
	A fatigue life and hypotheses under combined random loading Svoboda, Jaroslav ; Balda, Miroslav ; Frohlich, Vladislav The contribution deals with a problem of an application of hypotheses for fatigue damage cumulation and calculation of fatigue life of structures exposed to a random in-phase combined loading in tension-pressure - torsion. A new process has been developed for a Corten-Dollan hypotheses. A proposal has been given for a choice of the correction curve power kCD, as a function of a main stress standard deviatio s1. Detailed record
	Using hypotheses for calculating fatigue lives of parts exposed to combined random loads Balda, Miroslav ; Svoboda, Jaroslav ; Fróhlich, Vladislav The contribution deals with a complicated problem of fatigue damage of structure parts, which are loaded by a combination of random forces in tension-pressure and moments in torque. An attempt for estimating the total damage is made. It is basedon an application of a virtual damaging stress. The damage is evaluated by meansof the hypothesesof Palmgren-Miner and Corten-Dolan, which are appliedto a rain -flow-like sequence of a resulting stress. Detailed record
	Structure life under a multiaxial loading Svoboda, Jaroslav ; Balda, Miroslav ; Fróhlich, Vladislav The contribution deals with a problem of fatigue life of structures exposed to a proportional random multiaxial loading in tension - pressure and torsion. Tests proved that a fatigue damage is stronglydependent on the main stress level, while maintaining the corresponding maximum shear stress constant. The obtained fatigue-life curve as a main stress standard deviation as function of the number of loading blocks has the similar character as the S-N curve under harmonic loading. Detailed record

See also: similar author names
55	SVOBODA, Jakub
80	SVOBODA, Jiří
4	Svoboda, J.
55	Svoboda, Jakub
113	Svoboda, Jan
2	Svoboda, Jan,
40	Svoboda, Jaroslav
2	Svoboda, Jindřich
80	Svoboda, Jiří
6	Svoboda, Jonáš
23	Svoboda, Josef
2	Svoboda, Jáchym

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