P—da/dN一△K曲线测试的小样本方法  

METHOD FOR TESTING CURVE P-da/dN-△K USING SMALL SAMPLES

作　　者：丁克勤[1] 傅惠民[2] 

机构地区：[1]锅炉压力容器检测研究中心,北京100013 [2]北京航空航天大学固体力学研究所,北京100083

出　　处：《机械强度》2000年第3期224-227,共4页Journal of Mechanical Strength

摘　　要：提出一种测试高可靠度Ｐ—ｄａ／ｄＮ－△Ｋ曲线的小样本方法，该方法可以综合利用以往的经验数据和当前试验数据来确定疲劳裂纹扩展性能曲线。与传统的只能利用当前试验数据确定Ｐ—ｄａ／ｄＮ－△Ｋ曲线的方法相比，其可利用的信息量有了大幅度增加，所以在精度相同的情况下，可以节省大量试件；或在试样数一定的情况下，又可大大提高预测精度。文中还给出了一个试验对比实例。Method for testing P-da/dN-△K curve with high reliability using small samples is presented in the paper. The information that can be used in the proposed method is much more than that in the traditional methods, because this method can make full use of the current test data and the previous data, while the traditional method can Only use current test data. Thus, fewer specimens are required in the present method to obtain same accuracy and the result is more accurate for the same number of specimens. A experimental contrast example is also compared in the paper.

关 键 词：小样本方法 可靠性 疲劳试验 裂纹扩展速率曲线 

分 类 号：O346.2[理学—固体力学] TB114.3[理学—力学]