在细观分析模型的基础上, 利用ABAQUS有限元程序对T6热处理后不同体积分数的颗粒增强SiCP/6061Al合金复合材料的单调拉伸行为和单轴循环变形行为进行了有限元数值模拟; 同时, 通过与相应的实验结果的比较对模拟效果进行了评价. 模拟结果表明: 由于针对基体采用了新发展的、能够描述其循环棘轮行为的材料本构模型, 本文建立的有限元分析模型对颗粒增强金属基复合材料的循环变形行为, 特别是循环棘轮行为得到了较为合理的描述. 模拟结果同时还揭示了复合材料内循环变形行为在细观层次上的不均匀性和复杂性.
Based on the meso-mechanical model established for T6-treated SiCP/6061Al alloy composites, the monotonic tensile and uniaxial cyclic deformation behaviors of the composites were simulated numerically by using elastic-plastic finite element code ABAQUS; and then the simulated results were compared with the corresponding experiments in order to discuss the reasonability of the finite element simulation. It is shown that: since a newly developed cyclic constitutive model describing the ratcheting behavior reasonably is employed for T6-6061Al alloy matrix, the finite element model established in this work simulate the uniaxial cyclic deformation of the composites well, especially for the ratcheting behavior. It is also shown that the cyclic deformation of the composites is heterogeneous and complicated in meso-scale.
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