Abstract The design of reliable structures and the estimation of the residual fatigue life of industrial parts containing flaws or cracks rely on our ability to predict the propagation of fatigue cracks. Whereas in industrial component cracks might have a complex path due to geometry and loading, lab experiments used for identifying crack propagation law are often in pure mode I. The paper presents a synthesis of an experimental benchmark performed in the context of a French national research network. A sample has been designed to produce mixed-mode crack propagation and variation of small scale yielding conditions. Two geometries and two maximum load levels are defined for the two tested materials: a stainless steel and an aluminum alloy. Around ten participants performed experiments using their usual instrumentation. Among the eight possible parameter sets, three are selected for which detailed results are presented. A satisfying overall agreement is obtained. But, some discrepancies are evidenced due either to limitations of the instrumentation or simply because from one lab to the other the applied load is not exactly the same. It is thus concluded that one of the most important issue is boundary conditions, which is confirmed by numerical simulations.

中文翻译：

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具有混合模式方面和塑性效应的疲劳裂纹扩展实验基准

摘要 可靠结构的设计和包含缺陷或裂纹的工业部件的剩余疲劳寿命估计依赖于我们预测疲劳裂纹扩展的能力。鉴于在工业部件中，由于几何形状和载荷的原因，裂纹可能具有复杂的路径，用于识别裂纹扩展规律的实验室实验通常采用纯模式 I。本文介绍了在法国国家研究网络背景下进行的实验基准的综合. 样品已设计用于产生混合模式裂纹扩展和小规模屈服条件的变化。为两种测试材料定义了两种几何形状和两种最大负载水平：不锈钢和铝合金。大约十名参与者使用他们常用的仪器进行了实验。在八个可能的参数组中，选择了三个，并给出了详细的结果。获得了令人满意的总体一致性。但是，由于仪器的限制，或者仅仅是因为从一个实验室到另一个实验室施加的负载并不完全相同，因此证明了一些差异。因此得出结论，最重要的问题之一是边界条件，这已通过数值模拟得到证实。