Multiaxial Fatigue Limit Criterion of Metals

摘要: In the present article attention is focused on problem of fatigue limit criterion, which extension usual concept uniaxial under multiaxial stress conditions. The intensity cyclic loads at level usually low such that behaviour component remains apparently elastic macroscopic scale. However, it experimentally observed even absence detectable plastic strains, some metals grains located in most stresses zones a suffer slip. This irreversible process takes place grain scale metal responsible for crack initiation high-cycle loading. Investigation this phenomenon necessitates introduction mesoscopic material description (i.e. metallic aggregate), addition to continuum mechanics. Within framework approach, local and strains acting are linked with help Lin-Taylor assumption. elaborated criterion essentially defined as restraint be applied strain accumulated by loading those crystals aggregate undergone Comparison predictions proposed against experimental results obtained proportional non-proportional conditions shows good agreement.