基于3种断裂韧性测试方法的试验分析

Experimental analysis based on three fracture toughness test methods

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JIC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.