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Title: CMOD-based J integral measurement for surface cracked specimens
Authors: Qian, X. 
Li, Y.
Keywords: Compliance
Crack-mouth opening displacement
Domain integral
Energy release rate
Surface crack
Issue Date: 2013
Citation: Qian, X.,Li, Y. (2013). CMOD-based J integral measurement for surface cracked specimens. 13th International Conference on Fracture 2013, ICF 2013 2 : 1463-1471. ScholarBank@NUS Repository.
Abstract: 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.
Source Title: 13th International Conference on Fracture 2013, ICF 2013
Appears in Collections:Staff Publications

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