DUCTILE CRACK INITIATION AND STEADY-STATE PROPAGATION OF HIGH STRENGTH STRUCTURAL STEEL

Acta Metall Sin

1989, Vol. 25

Issue (6): 49-54 DOI:

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DUCTILE CRACK INITIATION AND STEADY-STATE PROPAGATION OF HIGH STRENGTH STRUCTURAL STEEL

CHEN Huangpu;DENG Zengjie Xi'an Jiaotong University CHEN Huangpu; The Research Institute for Strength of Metals; Xi'an Jiaotong Universify; Xi'an 710049

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CHEN Huangpu;DENG Zengjie Xi'an Jiaotong University CHEN Huangpu; The Research Institute for Strength of Metals; Xi'an Jiaotong Universify; Xi'an 710049. DUCTILE CRACK INITIATION AND STEADY-STATE PROPAGATION OF HIGH STRENGTH STRUCTURAL STEEL. Acta Metall Sin, 1989, 25(6): 49-54.

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Abstract The resistance to crack propagation at earlier stage for a high strengthstructural steel of certain ductility with relation to its microstructures, stressstates, deformation history and strain characteristic has been investigated. The resist-ance to crack propagation is mainly determined by the plastic constrain ahead ofthe crack tip and the elastic energy and plastic work absorbed in the stress-strainfield. These are connected with the state function of triaxial stress. The deforma-tion history and strain characteristic during deformation of material are describedby the flow line in which the deformation history and strain characteristic re-strain the crack initiation at stage II and the crack propagation at stage III. Thestrain hardening rate may sensitively reflect the stress distribution and micro-frac-ture mechanism in the interior of material.

Key words: high strength structural steel microstructure stress state strain characteristic

Received: 18 June 1989

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