ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 8

Characterization of Fracture Behavior in Small Punch Test by Combined Recrystallization-Etch Method and Rigid Plastic Analysis

Mao, X
Research Institute for Strength and Fracture of Materials, Faculty of Engineering, Tohoku University, Sendai,

Shoji, T
Research Institute for Strength and Fracture of Materials, Faculty of Engineering, Tohoku University, Sendai,

Takahashi, H
Research Institute for Strength and Fracture of Materials, Faculty of Engineering, Tohoku University, Sendai,

(Received 28 December 1985; accepted 31 July 1986)

Abstract

The purpose of this investigation is to understand the deformation process of the small punch test and to use it to characterize the fracture properties of materials. By comparisons between recrystallization-etch results and perfect-rigid plastic analysis, the deformation process of the small punch test has been clearly divided into three regions. Equivalent fracture strain under biaxial stress state has been obtained from 10 by 10 by 0.5 mm thin sheet samples using both a recrystallization-etch technique and a semi-analytical method to characterize the fracture property of the material. The results of biaxial equivalent fracture strain can be related almost linearly to fracture toughness (J_Ic) for elastic-plastic behavior.

Keywords:
recrystallization-etch technique, intense strain region, rigid plastic bending, plastic membrane stretching, plastic work, equivalent strain, fracture toughness (JIc)

Paper ID: JTE11549J
DOI: 10.1520/JTE11549J
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