13th International Conference on Fracture June 16–21, 2013, Beijing, China -10- 6. Conclusions According to the experimental and numerical research, it is concluded that: (1), the stress parameter, such as the principal stress or equivalent stress, can not appropriately describe the crack initiateand propagate from the edge of a void in porous material. Whereas, the strain parameter, such as the equivalent strain, can be used to describe this phenomena. (2), based on the detailed analysis, a theory of gradient ot the equivalent strain is suggested. According to this theory, the crack initiated point and the path of the crack from the void edge can be predicted appropriately. Acknowledgments This work was supported by the National Natural Science Foundation of China（10932007, 11172228） References [1]V. C. Orsini, M. A. Zikry, Void growth and interaction in crystalline ma-terials. Int J Plasticity, 17 (2001) 1393-1417. [2]T. L. O'Regan, D. F. Quinn, et al. Void growth simulations in single crystals. Comput Mech, 20(1997) 115-121. [3]M. Yang, X.H. Dong, Simulation of lattice orientation effects on void growth and coalescence by crystal plasticity. Acta Metall Sin, 22(2009) 40-50. [4]W. H. Liu, X. M. Zhang, et al. Simulation of void growth and coalescence behavior with 3D crystal plasticity theory. Comput Mater Sci, 40(2007)130-139.
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