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PREDICTION OF THE FATIGUE THRESHOLD FOR A CRACKED BODY USING SHAKEDOWN THEORY
Author(s) -
Huang Y.J.,
Stein E.
Publication year - 1995
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.1460-2695.1995.tb00882.x
Subject(s) - shakedown , radius , materials science , structural engineering , constant (computer programming) , fracture (geology) , fatigue testing , square root , fracture mechanics , mathematics , composite material , geometry , engineering , finite element method , computer science , computer security , programming language
— In this paper, the fatigue threshold Δ K th of a cracked body is studied. Unlike other approaches given in the literature, the shakedown theory is used for predicting Δ K th . A crack is considered as a sharp notch, the radius of which, at the threshold stress level, is a material constant. The threshold of crack propagation is explained as being due to shakedown of the cracked body, and a simple but reasonable model is derived. The value of Δ K th is found to be proportional to the yield stress multiplied by the square root of the effective crack tip radius. Using this model, Δ K th is calculated for some materials. Comparison of the predicted fatigue thresholds with those obtained by experiments, or by using other approaches, indicates that our model provides satisfying results.