Ⅰ－Ⅱ复合型裂纹亚临界扩展研究

SUB-CRITICAL GROWTH OF Ⅰ-Ⅱ MIXFD MODE CRACK

对两种工程材料ＬＹ１２－ＣＺ铝合金和１６Ｍｎ钢的薄板斜拉伸试件进行了裂纹扩展试验研究。提出了用当量裂纹法预测Ⅰ－Ⅱ复合型裂纹亚临界扩展寿命的方法。实验结果表明，当量裂纹法预测复合型裂纹疲劳寿命的方法简单可行。

On the basis of former study of mixed mode crack crJtical growth,a equivalentmethod for predicting Ⅰ-Ⅱ mixed mode crack sub-critical growth is presented.Thecyclic-tension specimens of two kinds of material-LY 12-CZ alminum alloy and 16Mn steelwith inclined crack were tested.The result showed that the equivalent method is available forpredicting fatigue life. According to the experimental results,the pecularity of subcriticalcrack growth are discussed.