单试样三点卸载柔度法测定金属材料J_R阻力曲线

Determination of J_R Resistance Curve of Metallic Materials by Single-Sample Three-Point Unload Compliance Method

在三曲线法和卸载柔度法的基础上,提出了测试金属材料延性断裂韧度的单试样三点卸载柔度法。除了具有三曲线法和卸载柔度法的优点之外,它还具有减缓弹性滞后现象和减少卸载次数的优点。运用该方法,使用自行研发的J积分测试软件测得的JR阻力曲线与多试样法的结果比较吻合。

Based on the three-curve method and unload compliance method, the single-sample three-point unload compliance method was put forward for testing the ductile fracture toughness of metallic materials. In addition to possessing merits of the three-curve method and unload compliance method, it possesses merits for delaying the elasticity lag and reducing unload times. The resistance curves were tested using this method and J integral testing software developed by the authors.The results tally with those of the multi - sample method.