将相当应变的观点应用到含有一个焊缝裂纹的焊接宽板中，可以看出焊缝金属与母材塑性的差异显著影响其断裂韧性和裂纹扩展驱动力，重要的一点是仅根据断裂韧性或裂纹扩展驱动力来衡量焊接接头非等组配的影响是不够的，如果材料的应力应变曲线合线性硬化规律，得出一个简单的ＣＴＯＤ设计曲线的修正表达式，可以用来预测焊接结构的极限载荷、极限应变或极限裂纹长度。 Applying the concept of considerable strain to welded wide plates with one weld crack, it can be seen that the difference in plasticity between the weld metal and base metal significantly affects its fracture toughness and crack propagation drive. The important point is that based only on the fracture toughness or It is not enough to measure the effect of the crack propagation force on the non-equivalent welding joint assembly. If the stress-strain curve of the material complies with the law of linear hardening, a simple modified expression of CTOD design curve can be obtained, which can be used to predict the limit of welding structure Load, ultimate strain or ultimate crack length.