CMOD-Based J Integral Measurement for Surface Cracked Specimens
This paper proposes an experimental approach based on the measured crack-mouth opening displacement (CMOD) to determine the mode I energy release rate for surface cracks in plate specimens subjected to four-point bending.The proposed experimental scheme measures the load versus CMOD relationships in a surface cracked specimen under four-point bending,and computes the relative rotation,θ,between the two crack planes based on the measured CMOD,and the bending moment (M) applied on the cracked cross section based on the measured load.The energy release rate,measured by the J-integral value,computes from the area under the M-θ curve,similar to the eta-approach originally proposed by Rice and co-workers for single-edge-notched bend,SE(B),specimens.This study examines the above approach for four plate specimens with fatigue pre-cracked,machined surface notches.The measured J value shows close agreement with the energy release rate computed using the domain integral approach.
surface crack crack-mouth opening displacement energy release rate domain integral compliance
Xudong Qian Ya Li
Department of Civil and Environmental Engineering,National University of Singapore,Singapore 117576,Singapore
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）