The results show that there are many problems inpresent JIC testing, such as the form of blunting line, the method ofdetermine JIC, the condition of validness of J-integral and plane-strain and so on.

• 研究表明，目前的J积分测试方法存在许多问题，例如钝化线方程、J_(IC)的确定方式、J_(IC)有效性及试样尺寸的平面应变条件的检验规则等，本文对上述问题进行了讨论并提出了相应的解决办法。