标准摘要
[中文适用范围]： 本文件规定了根据应力强度因子 (K)、裂纹尖端张开位移或 CTOD (δ) 以及金属材料焊缝 J 积分的实验等效值 (J) 确定断裂韧性的方法。 本文件是对 ISO 12135 的补充，ISO 12135 涵盖了母材断裂韧性测试的所有方面，需要与本文件结合使用。 本文件描述了确定断裂韧性点值的方法。 它不应被视为获得有效 R 曲线（抗裂纹扩展曲线）的一种方法。 然而，在确定焊缝的 R 曲线时，可以有效地采用本文件中描述的试样制备方法。 这些方法使用疲劳预裂样本，这些样本在焊接后在焊缝的特定目标区域中被开槽。 描述了评估焊缝在目标区域（焊缝金属内或焊缝热影响区（HAZ）内）缺口放置的适用性的方法，然后在适当的情况下评估疲劳的有效性对这些区域进行采样时出现裂缝。 [外文原描述]： ISO 15653:2018 specifies methods for determining fracture toughness in terms of stress intensity factor ( K ), crack tip opening displacement or CTOD ( δ ) and experimental equivalent of the J -integral for welds in metallic materials ( J ). ISO 15653:2018 complements ISO 12135, which covers all aspects of fracture toughness testing of parent metal and which needs to be used in conjunction with this document. This document describes methods for determining point values of fracture toughness. It should not be considered a way of obtaining a valid R -curve (resistance-to-crack-extension curve). However, the specimen preparation methods described in this document could be usefully employed when determining R -curves for welds. The methods use fatigue precracked specimens which have been notched, after welding, in a specific target area in the weld. Methods are described to evaluate the suitability of a weld for notch placement within the target area, which is either within the weld metal or within the weld heat-affected zone (HAZ), and then, where appropriate, to evaluate the effectiveness of the fatigue crack in sampling these areas.
英文名称Metallic materials — Method of test for the determination of quasistatic fracture toughness of welds