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SHORT CRACK COALESCENCE AND GROWTH IN 316 STAINLESS STEEL SUBJECTED TO CYCLIC AND TIME DEPENDENT DEFORMATION
Author(s) -
Gao N.,
Brown M. W.,
Miller K. J.
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.tb00866.x
Subject(s) - coalescence (physics) , materials science , creep , crack closure , ultimate tensile strength , composite material , structural engineering , metallurgy , fracture mechanics , engineering , physics , astrobiology
— A study has been undertaken into short crack growth behaviour of AISI type 316 stainless steel under creep‐fatigue conditions at 550°C within the high strain range of 0.9 to 2.5% and including a 60 min hold‐time. During the high‐temperature, reverse‐bending tests, surface crack initiation and growth on both the tensile‐hold and the compressive‐hold sides of circular‐section specimens were monitored by means of a plastic replication technique. Detailed analysis revealed that under creep‐fatigue conditions, the initiation and growth behaviour of many individual cracks and their subsequent coalescence to form a major Stage II (tensile) crack was the dominant feature in the failure process. A life prediction model is proposed which incorporates the process of short crack coalescence. Satisfactory predictions of creep‐fatigue lifetimes are derived from the model.