Abstract The tensile behavior of individual struts extracted from an open-cell aluminum foam is investigated here. X-ray microtomography is used to characterize the initial state of the struts in 3D, before micro-tensile testing performed under digital image correlation. A microstructure-sensitive finite element (FE) model is run afterwards, using a FE mesh conforming to the tomography volume and a constitutive model based on Gurson-Tvergaard-Needleman (GTN) porous plasticity. The model is made dependent on the local measure of intermetallic particles volume fraction in order to account for their embrittlement effect. Model and experiments delineate the first order effect of structure and shape on the plastic flow and fracture of the struts. The distribution of intermetallic particles influences fracture location only where minor variations of cross-section can be found. The model performs well at predicting the fracture zones but misses additional ingredients to assess the dispersion of yield strength among the struts.

中文翻译：

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从泡沫铝中提取的支柱的微拉伸行为

摘要 这里研究了从开孔泡沫铝中提取的单个支柱的拉伸行为。X 射线显微断层扫描用于在 3D 中表征支柱的初始状态，然后在数字图像相关性下进行微拉伸测试。之后运行微观结构敏感有限元 (FE) 模型，使用符合断层扫描体积的 FE 网格和基于 Gurson-Tvergaard-Needleman (GTN) 多孔塑性的本构模型。该模型依赖于金属间颗粒体积分数的局部测量，以解释它们的脆化效应。模型和实验描述了结构和形状对支柱塑性流动和断裂的一阶影响。金属间化合物颗粒的分布仅在可以发现横截面微小变化的地方影响断裂位置。该模型在预测断裂带方面表现良好，但遗漏了额外的成分来评估支柱之间的屈服强度分布。