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Fatigue life prediction for simultaneous cyclic loading with blocks of normal stresses and shear stresses

VALERIU V. JINESCU*
 

Industrial Process Equipment Department, Politehnica University of Bucharest, Splaiul Independentei 313, Bucharest, România

Abstract. The problem of effects superposition in the case of simultaneous loadings, an important issue in mechanical structures design, have been analised. A method for the multiaxial fatigue life prediction was developed. This method was applied to fatigue life calculation in the cases of cyclical loading with: – one block of normal stress and one bloc of shear stress; – successive blocks of normal stresses, simultaneous with successive blocks of shear stresses. The influence of deterioration, of mean stress and residual stress upon the fatigue life is introduced. The theoretical results: – have been compared with experimental results reported in literature; – may be used for design, as well as for experimental data evaluation. Numerical examples show how the obtained theoretical results may be used in practical cases.

Keywords. Fatigue life, fracture criterion, principle of critical energy, simultaneous cyclic loadings, successive cyclic loadings.
 
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