【摘要】 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。更多还原

【Abstract】 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 corresponding to the external load,the less accuracy will be obtained.更多还原