SEDL / STP / STP1114-EB / STP16854S

Analysis of Deformation Behavior During Plastic Fracture

Hu, JM
Research associate and professor, University of Maryland, College Park, MD

Albrecht, P
Research associate and professor, University of Maryland, College Park, MD

Pages: 19    Published: Jan 1991

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Abstract

The authors have previously shown that the cracks in compact tension specimen fabricated from A533B steel, HY80 steel, A710 steel, and CS19 aluminum extended at limit load. The present study examines the deformation behavior of C(T) specimens. The approach consists of deriving an equation for the plastic rotation factor, proposing an empirical equation for the plastic CTOD R-curve, and presenting the procedures for predicting the load versus load-line displacement curve with the plastic CTOD R-curve and limit load solution. The results obtained in this study lead to three important observations. First, many specimens that were reported by previous investigators to have failed in elastic-plastic fracture actually failed in plastic fracture. Second, a parameter based on plastic deformations at the crack tip, such as plastic CTOD, may better characterize the resistance to crack extension in plastic fracture. Third, for the fully plastic range of fracture behavior, the curve of load versus load-line displacement can be predicted knowing two material properties, the flow stress and the plastic CTOD R-curve.