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SJTU Made Breakthrough in Peridynamic Fracture Theory

May 09, 2018      Author: School of Naval Architecture, Ocean & Civil Engineering (NAOCE), SJTU

Recently, research findings of Qiao Pizhong's team, the School of Naval Architecture, Ocean & Civil Engineering (NAOCE), SJTU - "A state-based peridynamic model for quantitative fracture analysis" is published on International Journal of Fracture, a prestigious journal in fracture theory study. In their research, the general relationship of the critical stretch and the critical energy release rate is for the first time obtained for the state-based peridynamic model of linear elastic brittle materials, hence expanding the application scope of peridynamics in analyzing material fracture and impairment. Professor Qiao Pizhong is the corresponding author and doctoral student Zhang Heng is the first author.

The research is funded by National Natural Science Foundation of China (51478265,51679136).

Abstract:A new state-based peridynamic model is proposed to quantitatively analyze fracture behavior (crack initiation and propagation) of materials. The three-dimensional (3D) and two-dimensional (2D) (for both plane stress and plane strain) cases are all considered. As illustrations, the compact tension and double cantilever beam tests are analyzed using the proposed model, which is capable of successfully capturing fracture behaviors (e.g., crack path and concentration of strain energy density) of the considered fracture tests. The characteristic parameters (i.e., critical load, critical energy release rate, etc.) are calculated and compared with available experimental and numerical data in the literature to demonstrate validity of the proposed model.

Links of the paper:

https://link.springer.com/article/10.1007/s10704-018-0285-8

 

Translated by Chen Wanrong Reviewed by Wang Bingyu