Premium
A FATIGUE LIFE PREDICTION METHOD BASED ON A MESOSCOPIC APPROACH IN CONSTANT AMPLITUDE MULTIAXIAL LOADING
Author(s) -
Morel F
Publication year - 1998
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.1998.00452.x
Subject(s) - mesoscopic physics , amplitude , constant (computer programming) , materials science , structural engineering , computer science , engineering , physics , condensed matter physics , optics , programming language
The aim of this paper is to present a high cycle multiaxial fatigue life prediction method for metallic materials based on Papadopoulos’ previous works and limited to constant amplitude loading. The initiation process of a crack is treated as a mesoscopic phenomenon taking place on a scale of the order of a grain or a few grains. The damage variable chosen is the accumulated plastic strain at this mesoscopic scale. Its estimation requires a macro‐meso passage and the location of the plane subjected to maximum damage. Initiation is achieved as soon as a critical value of the accumulated plastic mesostrain is reached in these grains, so‐orientated that their easy glide directions coincide with a particular direction of the critical plane. The detrimental effect of out‐of‐phase loading on damage accumulation is taken into account through a newly defined coefficient estimated from mechanical loading parameters; no adjustable parameter is required. A good agreement has been found between the predicted and experimental results for in‐phase and out‐of‐phase sinusoidal constant amplitude loadings by examining a large amount of experimental data.