New post-yield fracture toughness parameters for engineering materials
- Xi`an Jiaotong Univ. (China). Dept. of Engineering Mechanics
Micromechanics approach is employed to investigate the constraint effect on post-yield fracture toughness. Relationships between the conventional post-yield fracture toughness values, J{sub lc} and {delta}{sub c}, and crack tip constraint characterized by the crack tip stress triaxiality are derived on the basis of an improved micromechanics criterion for ductile fracture. Then, new crack tip parameters J{sub mc} and {delta}{sub mc} (and associated new criteria for ductile fracture) are proposed, in which the effects of crack tip deformation and constraint are taken into account. Experiments show that both J{sub mc} and {delta}{sub mc} are material constant independent of stress state or specimen geometry. They can serve as new post-yield fracture toughness parameters to differentiate the fracture toughness of engineering materials, which provide new approaches for fracture assessments of engineering structures.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 131633
- Journal Information:
- Journal of Pressure Vessel Technology, Vol. 117, Issue 4; Other Information: PBD: Nov 1995
- Country of Publication:
- United States
- Language:
- English
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