DETERMINATION OF CRITICAL PLANES IN MULTIAXIAL FATIGUE WITH ESTIMATION OF SHEAR STRESS AMPLITUDE IN MECHANICAL COMPONENTS THROUGH DIFFERENT FAILURE CRITERIA

Resumo

Fatigue strength analysis in mechanical components is fundamental in the development across various industrial and economic sectors worldwide. Different materials are used in the construction of structural and mechanical elements subject to intermittent and intense usage under various loading conditions. The evaluation of fatigue strength of materials is widespread in diverse computational research, which presents various characteristic parameters according to fatigue strength and material failure criteria. The presence of shear stresses in materials, mean stresses, their amplitudes, and critical planes of rupture seek to identify the assessment of the structural reliability of these elements. The Susmel and Lazzarin Method and the Findley Method, together with the evaluation of the shear stress in a loading history in materials, are capable of indicating, according to stipulated criteria and parameters, error indices, and affirming the accuracy of the fatigue strength capacity of materials. Thus, the determination of fatigue strength can indicate better design, construction, and maintenance parameters for studied elements.