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	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
	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
	Corrosion influence on fatigue properties of steels, and changes by the deposit of thin layers Svoboda, Jaroslav ; Fróhlich, Vladislav ; Štěpánek, I. The report deals results of introduction works in a solution of the anticorrosion protection problem of dynamic loaded constructions, which will be a subject of common grant of laboratories ÚT AVČR and ZČU Plzeň. Out of economic reasons were experiments carried on speciments from a cheap carbon-steel 11523.1.There were fatigue-life-curves and the crack propagation obtained by the smooth and deponded speciments on the air. Further it were the change of fatigue-life by this speciments loaded in the corrosion environmen twatched and results compared. Detailed record
	Statistical processingof fatigue tests in LATEX Balda, Miroslav ; Svoboda, Jaroslav ; Fröhlich, Vladislav The paper deals with a problem of making up protocols on material fatigue tests containing measured data, their regression, 90% and 95% confidence intervals, a diagram of all these functions, and a table of the processing results. All these steps are done in one computer run in the LATEX environment without any import of external graphics or results. New styles have been developed for the purpose. The system is fast reliable. Detailed record
	A comparison of approaches to assessment of fatigue crack propagation Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav The Paris formula has been used for an evalution of a residual life of tube-form specimentswith a lateral hole. Detailed record
	A new information on evaluation of security of real structures stressed by combined random loading Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav The report deals with problems of evaluation fatigue life and security of real structures loaded by proportional combined random processes. Four real structure elements were used for a design and verification of computing methods for fatigue life and security estimates. The report contains all important instructions for the use of presented methods. Detailed record
	Únavové napětí a životnost reálných konstrukcí při kombinovaném náhodném zatěžování Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav Detailed record
	Fatigue life of structures under multiaxial nonpropagational loading Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav The contribution presents a neww approach to estimation of fatigue lives of structures loaded by multiaxialnonproportional harmonic loading. The approach comes out of exponential expressions for fatigue curves under multiaxial stress. It enables to evaluate fatigue lives out of the known S-N curves valid for uniaxial loading. The evoluation uses amplitudes of damaging stress, which has been formulated earlier. Detailed record

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3	Fröhlich, Vojtěch

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