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Review of the subsurface strain path approach to fatigue life assessment of components
Author(s) -
SHATIL G.
Publication year - 2005
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 - 10.1111/j.1460-2695.2004.00834.x
Subject(s) - structural engineering , materials science , finite element method , strain (injury) , range (aeronautics) , path (computing) , composite material , computer science , engineering , programming language , medicine
Fatigue lives obtained from complex testing and monitoring of different components often involve some degree of discrepancy in results due to geometrical variations, even when they are tested under controlled conditions and have a similar surface cyclic strain range at the critical location. Recently, several fatigue models have been developed to improve the correlation of specimen lives using a critical ‘process zone’ that surrounds the damaged material. A review of such an approach is presented. The approach is based on critical subsurface strains and consists of a fatigue damage summation procedure in the affected area. The fatigue life‐prediction model is applied to two structural materials using three geometries subjected to biaxial cyclic stresses. These include notched bars, rhombic plates and car components. The subsurface strains are evaluated by using a detailed elastic–plastic finite element analysis, and by considering critical subsurface fatigue strain paths. It is shown that in the several cases investigated, the subsurface approach appears to improve life predictions.