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Life prediction based on the propagation of short cracks
Author(s) -
Vehoff Horst,
Neumann Peter
Publication year - 1992
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199200538
Subject(s) - creep , materials science , growth rate , deformation (meteorology) , structural engineering , fracture mechanics , strain rate , mechanics , composite material , forensic engineering , engineering , mathematics , physics , geometry
The growth of short and long fatigue and creep‐fatigue cracks was examined in various steels. The experiments were carried out to test if recent models for creep‐fatigue crack growth can be applied to describe the influence of strain rate on the growth of large and small cracks. Damage parameters were derived from these crack‐growth laws for the life prediction under complicated loading. These parameters were applied to predict the life of smooth specimens cycled at different temperatures and deformation rates. Compared to conventional life predictions better predictions were obtained presumed the growth mechanism of the short cracks did not change for the range of temperature and strain rates in question.