ISO 22889:2007 金属材料 用低约束样品测定抗稳定裂纹扩展的试验方法

标准编号：ISO 22889:2007

中文名称：金属材料 用低约束样品测定抗稳定裂纹扩展的试验方法

英文名称：Metallic materials — Method of test for the determination of resistance to stable crack extension using specimens of low constraint

发布日期：2007-12

标准范围

ISO 22889:2007规定了通过对具有低塑性变形约束的裂纹试样施加准静态载荷，根据均匀金属材料的裂纹张开位移和临界裂纹尖端张开角，确定稳定裂纹扩展阻力的方法。紧凑型和中裂纹拉伸试样缺口，通过疲劳预裂，并在缓慢增加的位移下进行试验。ISO 22889:2007描述了对不满足尺寸不敏感断裂性能要求的试样进行试验的方法；即紧凑的样本和中间的-在相对较薄的压力表中有裂纹的拉伸试样。给出了确定裂纹扩展阻力曲线的方法。给出了中间裂纹拉伸试样断裂韧度点的确定方法。

ISO 22889:2007 specifies methods for determining the resistance to stable crack extension in terms of crack opening displacement and critical crack tip opening angle for homogeneous metallic materials by the quasistatic loading of cracked specimens that exhibit low constraint to plastic deformation. Compact and middle-cracked tension specimens are notched, precracked by fatigue, and tested under slowly increasing displacement.ISO 22889:2007 describes methods covering tests on specimens not satisfying requirements for size-insensitive fracture properties; namely, compact specimens and middle-cracked tension specimens in relatively thin gauges.Methods are given for determining the crack extension resistance curve. Methods for determining point values of fracture toughness for the middle-cracked tension specimen are also given.

标准预览图