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A DUCTILE FRACTURE MODEL IN MIXED MODES 1 AND 2
Author(s) -
Budden P. J.,
Jones M. R.
Publication year - 1991
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.1460-2695.1991.tb00675.x
Subject(s) - materials science , fracture (geology) , cracking , structural engineering , mixed mode , composite material , mode (computer interface) , stress (linguistics) , mechanics , engineering , physics , computer science , linguistics , philosophy , operating system
— Fracture due to crack growth under mixed Modes 1 and 2 loading is considered. The cracking mechanism addressed is that of microvoid growth and linkage under small‐scale‐yielding conditions. Stress analyses are described which take into account the blunting of the crack tip as the load increases. A damage function is defined, and is evaluated in the intensely‐straining region near the blunted notch tip. As the load increases, the size of this damaged region increases until a critical level of damage has been reached over a material‐dependent length scale and fracture ensues. The local fracture criterion is then related to the applied loads. The predictions of the model are tested against experiments under Mode 1 loading and also against some mixed Modes 1 and 2 data on a range of materials. The results of the model are conservative and reproduce the experimentally observed Mode 1 failures, in terms of AT, at fracture, to within 25%. In the case of mixed mode loading the model conservatively predicts the fracture load for most of the data.