材料的COD(裂纹张开位移)、示波冲击试验是常用的断裂韧性测试,根据局部法若能从一种实验结果预测另一种实验结果具有重要意义.本研究以X65钢为试验材料,对其进行了示波冲击及COD试验,并对试验数据进行统计处理,证明断裂参量CTOD(裂纹尖端张开位移)符合三参数威布尔分布.编制了自动求解局部断裂参量及由示波冲击预测CTOD的程序.通过比较COD实验和预测结果,表明在脆性断裂条件下基于局部法能够实现由示波冲击试验预测CTOD断裂韧性.
The crack opening displacement (COD) and the instrumented impact tests are the common test measures for examining fracture toughness.It is very important to predict one experimental result from another result based on local approach.The COD and the instrumented impact tests of X65 steel are made and the experimental data were carried out and statistically processed.It was certified that CTOD accords with three-parameter Weibull distribution.The program of the automatic solution of the local fracture parameters and prediction of CTOD from the instrumented impact test were completed.Comparing the experimental and predicted results show that CTOD can be predicted from the instrumented impact test based on the local approach for brittle fracture.
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