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	Fatigue tests of a model of fock-pin fitting of blades Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav Speciments, made out of X12Cr13 materialy were tested for fatigue life. The specimen was loaded by a static axial form and simultanously by a harmonic lateral force generating bending stress on the blade root. The goal of tests was to obtain S-N curve of the gover structure. Detailed record
	The Fatigue test of the forked suspener model of turbine blades Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav ; Jiřík, Petr ; Klášterka, Petr The report gatheres resultsof test, which had the aim to obtain fatigue properties of a pin fitting a root of turbine blade in a moving wheel. The detail is loaded by a combination of axial static load and dynamicbendingin lateral direction. The real stress has been mesured by a set of straingages near pinholes. Detailed record
	Properties of the termo-visco-elastic material 42-809 for the production of vibrodump elements - 2. part Svoboda, Jaroslav ; Pešek, Luděk ; Fröhlich, Vladislav ; Klášterka, Petr The contribution deals with results,the goal which has been to obtain friction properties of rubber elements made of the material 42-809. The results were expressed in the form of friction forms as functions of amplitudes of vibrations and a quantity of pressure force. Detailed record
	Properties of the termo-visco-elastic materials under the static and dynamic loading Svoboda, Jaroslav ; Pešek, Luděk ; Fröhlich, Vladislav The contribution deals with results of testing rubber segments used for railway vehical noise and vibration damping in assembled wheels. The results were obtained during a solution of the grant project No. 101/05/2669 of the Czech Science Foundation. Detailed record
	Fatigue strength and life of real structures under combined random loading Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav A rather often kind of combined stress is a case, when one of its components acts statically. The contribution deals with some rsults of research works,the goal of which has been to reveal an influence of the static component on a resulting fatigue life, and to find a way of its including into fatigue strength evalutions. A procedure for finding a critical stress for an estimating of a structure save life is presented. Unfortunately, the fatigue life calculation is more complicated and needs some experiments, which will yield additional informstion on a material behaviour under required stress combination and levels. Detailed record
	Velocity of fatigue crack propagation under combined stress with one static and the other dynamic component Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav Tube speciments have been tested under combinations of static and dynamic loading. It has been revealed that the static component influences fatigue life significantly without any effect on the crack direction. The contribution deals with the influence of the static component on the velocity of crack propagation, a range of the stress intensity factor, and coefficients of Paris formula for residual fatigue life calculations. Detailed record
	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
	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

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3	Fröhlich, Vojtěch

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