Premium
J ‐INTEGRAL APPROACH TO MODE III FATIGUE CRACK PROPAGATION IN STEEL UNDER TORSIONAL LOADING
Author(s) -
Tanaka K.,
Akiniwa Y.,
Nakamura H.
Publication year - 1996
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.1460-2695.1996.tb00993.x
Subject(s) - materials science , crack growth resistance curve , crack closure , fracture mechanics , crack tip opening displacement , composite material , structural engineering , hysteresis , shear (geology) , shielding effect , electromagnetic shielding , engineering , physics , quantum mechanics
— Mode III fatigue crack propagation tests were conducted on circumferentially cracked bars of a medium carbon steel under a constant value of the J ‐integral range. The Δ J value was evaluated from the loading part of the hysteresis loop of the applied torque and the angle of twist. The fracture surface was macroscopically flat for all cases examined in the present study. The crack propagation rate decreased with crack extension, because of the shear contact of the crack faces. The crack propagation rate, without contact shielding, obtained by extrapolating the relation between the crack propagation rate and the crack length to the pre‐crack length, was a power function of Δ J irrespective of the initial notch depth.