对不同矫直制度下钢轨钢进行的脆断过程中,声发射振幅分析可准确确定材料的失稳断裂过程和局部开裂,同时解释了矫直钢轨的脆性断裂行为。本文提出,根据AE能量转换关系dN/dt→dW/dt和N=DK~4可把振幅曲线所围成的面积近似做为裂纹扩展的表面能,即W∞v。 In the process of brittle fracture of rail steel under different straightening systems, acoustic emission amplitude analysis can accurately determine the instability and local cracking of the material, and explain the brittle fracture behavior of the straightening rail. This paper proposes that the area enclosed by the amplitude curve can be approximated as the surface energy of the crack propagation according to the energy conversion relationship of AE dN / dt → dW / dt and N = DK ~ 4.