损伤容限评价,需要预测剩余强度和临介裂纹长度。这两个数值可用薄板金属材料的裂纹阻力曲线(R-曲线)测定。众所周知,R-曲线是与板宽度和初始裂纹长度无关。本文利用R-曲线预测了8090CT8铝-锂合金的剩余强度和临介裂纹长度。为了避免违背断裂力学的有效性,对试验结果进行分析应特 Damage tolerance assessment, the need to predict the residual strength and the length of the temporary crack. These two values ​​can be measured using the sheet metal crack resistance curve (R-curve). It is well-known that R-curves are independent of plate width and initial crack length. In this paper, the R-curve was used to predict the residual strength and interfacial crack length of 8090CT8 aluminum-lithium alloy. In order to avoid breaking the validity of fracture mechanics, the test results should be analyzed