Commonly, fracture toughness tests on deeply cracked specimens are used to assess defects in large-scale components. The paper presents a method for selection of test specimen type, size and crack length in order to obtain fracture toughness estimates relevant to defects in cracked pipes. The method uses available closed-form $T$-stress, stress intensity factor and limit load solutions to determine the required specimen dimensions. The paper reports elastic–plastic finite element analyses for single edge notched bend (SENB) and single edge notched tension (SENT) specimens and cracked pipes which demonstrate good agreement of the matching approach, although care is needed in selecting the appropriate limit load solution for SENT geometries.

通常，对深裂试样的断裂韧性测试用于评估大型零件的缺陷。本文提出了一种选择试样类型，尺寸和裂纹长度的方法，以便获得与破裂管中缺陷有关的断裂韧性估算值。该方法使用可用的封闭形式$Ť$-应力，应力强度因子和极限载荷解决方案，以确定所需的试样尺寸。该论文报告了单边缺口弯头（SENB）和单边缺口拉力（SENT）试样以及破裂的管的弹塑性有限元分析，证明了匹配方法的良好一致性，尽管在选择合适的极限载荷解决方案时需要格外注意。已发送几何。