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PROPAGATION AND NON‐PROPAGATION OF SHORT FATIGUE CRACKS AT A SHARP NOTCH
Author(s) -
Tanaka K.,
Nakai Y.
Publication year - 1983
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.1460-2695.1983.tb00347.x
Subject(s) - crack closure , materials science , stress intensity factor , stress concentration , crack growth resistance curve , fracture mechanics , structural engineering , paris' law , compact tension specimen , composite material , crack tip opening displacement , stress (linguistics) , engineering , linguistics , philosophy
— Sharply notched specimens of a structural low‐carbon steel were fatigued under several ratios of the maximum to minimum loads. The growth behavior of a short fatigue crack near the notch tip was analyzed based on crack closure measurements. A fatigue crack first decelerates with increasing crack length, and then accelerates or becomes non‐propagating depending on the applied stress. A similar deceleration is seen when the rate is correlated to the stress intensity range. The effective stress intensity range is a unique parameter in correlating the growth rate of a short crack for all the stress levels examined, and the relation is identical to that obtained for a long crack. By considering the increase in crack closure with crack length, a quantitative method is proposed for predicting the non‐propagating crack length and the fatigue limit of notched specimens as a function of the applied stress and the notch geometry.