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 Machine structures, which are used now and especially vehicles (motor cars, airplanes, rail vehicles, engines, etc.) have to meet high durability requirements resulting from rigorous safety and reliability standards. It turns out, that each, even minor fatigue cracks, it may be cause leading towards machine structure destruction and consequently to catastrophe. During designing it is necessary to determine stress and deformation condition during entire structure operation taking into consideration load spectrum occurring due to changing of system configuration, environmental interaction variables, translocations of elements being under load, use, minor local damages resulting during operation.
The aim of thesis was to elaborate determination methods of changing stress fields and deformations under influence of variable geometrical configuration and load variable in time using simulation of Finite Element Method (FEM). It has made possible to forecast of stress condition changes in critical fields in which it is possible initiation of crack and forecast of possible crack propagation. Airplane landing gear has been assumed as example for simulation.
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