本文件规定了用K、δ、JandR曲线测定准静态载荷下均质金属材料断裂韧性的方法。试样有缺口，经过疲劳预裂，并在缓慢增加的位移下进行试验。在韧性裂纹扩展开始时或之后，或在韧性裂纹失稳或不稳定裂纹扩展开始时，测定单个试样的断裂韧性。如果裂纹在延性撕裂条件下以稳定的方式扩展，则测量描述断裂韧性作为裂纹扩展函数的阻力曲线。在铁素体材料试验的某些情况下，不稳定的裂纹扩展可通过解理或韧性裂纹萌生和扩展发生，并被解理扩展中断。 本文件不包括止裂时的断裂韧性。测试焊接件时，需要特殊的测试要求和分析程序，ISO 15653对这些要求和分析程序进行了描述，ISO 15653是对本文件的补充。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies methods for determining fracture toughness in terms ofK, δ, JandR-curves for homogeneous metallic materials subjected to quasistatic loading. Specimens are notched, precracked by fatigue and tested under slowly increasing displacement. The fracture toughness is determined for individual specimens at or after the onset of ductile crack extension or at the onset of ductile crack instability or unstable crack extension. In cases where cracks grow in a stable manner under ductile tearing conditions, a resistance curve describing fracture toughness as a function of crack extension is measured. In some cases in the testing of ferritic materials, unstable crack extension can occur by cleavage or ductile crack initiation and growth, interrupted by cleavage extension. The fracture toughness at crack arrest is not covered by this document. Special testing requirements and analysis procedures are necessary when testing weldments, and these are described in ISO 15653 which is complementary to this document.All current amendments available at time of purchase are included with the purchase of this document.