对半椭圆形表面裂纹弹塑性断裂力学参量J积分的直接测试方法进行了深入分析 ,并在此基础上 ,实际测试了存在于均匀母材试样及力学性能不均匀的高匹配焊接接头焊缝区的表面裂纹的断裂力学参量J积分。结果表明 ,本文所采用的试验方法是可行的 ,且试验结果能够反映材料及力学性能不均匀性对断裂力学参量的影响 ;随匹配的降低 ,高匹配接头焊缝区表面裂纹的断裂力学参量J积分值增大。 The direct test method of elastic-plastic fracture J integral of semi-elliptical surface crack was analyzed in depth. On the basis of this, a real test was made on the specimens of uniform base metal and the high matching weld joints with non-uniform mechanical properties Area crack crack mechanics parameters J integral. The results show that the test method adopted in this paper is feasible and the test results can reflect the influence of material and mechanical inhomogeneity on the fracture mechanics parameters. With the decrease of matching, the fracture mechanics parameters J Integral value increases.