微观力学
聚结(物理)
材料科学
成核
钛合金
极限抗拉强度
实验数据
表征(材料科学)
有限元法
合金
结构工程
复合材料
工程类
纳米技术
物理
化学
有机化学
统计
复合数
天体生物学
数学
作者
Carlos Rojas-Ulloa,Marian Valenzuela,Víctor Tuninetti,Anne Marie Habraken
标识
DOI:10.1177/14644207211009933
摘要
In this research, the Stewart-Cazacu micromechanics coupled damage model is extended and validated adding nucleation and coalescence models as new damage mechanisms. The Ti–6Al–4V titanium alloy is chosen as a suitable hcp ductile material to be modeled using this extended damage law. The characterization of the damage evolution in this alloy is addressed throughout a quasi-static experimental campaign. Damage characterization relies on in situ X-ray tomography data and scanning electron microscopy imaging technique. The validation procedure consists in the implementation into the finite element research software Lagamine of ULiège and in the comparison of numerical predictions and experimental results. Load–displacement curves and damage-related state variables at fracture configuration from smooth and notched bar specimens submitted to tensile tests are analyzed. The nucleation and coalescence model extensions as well as an accurate elastoplastic and damage material parameter identification for Ti–6Al–4V samples are essential features to reach a validated model. The prediction capabilities exhibited for large strains are in good agreement with experimental results, while the near-fracture strains can still be improved.
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