基于启裂载荷的临界裂纹尖端张开角确定

Critical Crack Tip Opening Angle Calculation Based on Crack Initiation Load

对临界CTOA的确定方法进行了研究,提出了一种新的临界CTOA的估算方法。该方法仅需要确定裂纹启裂载荷及裂纹扩展量为1 mm时的外载荷,相较于ASTM E2472给出的4种测量方法,该方法简单易推广。应用4件M(T)试样与6件C(T)试样对该方法进行了验证,结果表明:文中方法适用于平面应力状态,且计算误差不超过4%。此外,新方法的精度与所选外载荷有关,外载荷对应的裂纹扩展量越大CTOA的计算误差越大。

Critical CTOA calculation method is studied in this work, a novel critical CTOA calculation method has been proposed. Only crack initiation load and load corresponding to 1 mm crack extension are required. Compared with the four methods included in ASTM E2472, this method is easier to use. Four M （T） specimens and six C （T） specimens are taken to validate this method. Discrepancies are less than 4% under plane stress conditions. In addition, the accuracy of the proposed method is related to the external load selected, the larger crack extension corre-sponding to the external load, the less accuracy will be obtained.