归纳总结了 3 种 J 积分测试方法, 即卸载柔度法、规则化法和 S_pb 分离参数法测量断 裂韧性的原理, 并针对某金属材料分别采用 3 种方法进行了对比测试. 发现 3 种方法均可以获 得有效的 J_IC 值, 由卸载柔度法得到的 J_IC 值最大, 由规则化法得到的 J_IC 值最小, 但与 S_pb分离参数法较为接近.

The theories of fracture toughness measurement for three J-integral test methods, including unloading compliance method, normalization method and S_pb separation parameter method, are summarized, and the three methods are used to test the fracture toughness of a metal material. It is found that all the three methods can obtain effective J_IC values. The J_IC value obtained by the unloading compliance method is slightly greater than those obtained by the other two methods, and the result obtained by the normalization method is slightly smaller than those obtained by the other two methods but close to that by the S_pb separation parameter method.