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In this paper, the orientation of grains which adjacent to a developed opening crack was investigated by EBSD. A definition of θ has been came up with which represents the angle between the principal stress plane and each { } 111 plane of the grains. Smaller θ means easier to crack. It gave a good explanation of the crack propagation throughout the grains. It also revealed that propagation path is along with the { } 111 plane. This finding will give a prediction of tear properties and help us understanding the cracking mechanism and the behavior of tearing.

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