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颗粒失效对SiC增强铝基复合材料屈服应力的影响

Effects of particle failure on the yield stress of SiC reinforced aluminum alloy composites

中文摘要英文摘要

基于修正的剪切滞后模型、Eshelby等效夹杂理论以及Weibull统计分布,发展了SiC增强铝基复合材料屈服应力的本构模型。模型考虑了变形过程中SiC颗粒失效(包括颗粒断裂和颗粒脱粘)对复合材料屈服应力的影响。研究表明:复合材料的屈服应力随着SiC颗粒体积分数的增加而增加,但随着SiC颗粒尺寸的增加而降低。选取了多种铝合金,包括工业纯铝、Al-Mg-Si合金, Al-Cu-Mg合金以及Al-Zn-Mg 合金,作为复合材料的基体材料进行了屈服应力的测试,以验证模型的准确性。通过与实验结果的对比可知,本文发展的本构力学模型比传统的修正剪切滞后模型更加准确,这表明SiC颗粒失效对复合材料的屈服应力有重要的影响。

constitutive model for the yield stress of SiC reinforced aluminum alloy composites has been developed based on the modified shear lag model, Eshelby’s equivalent inclusion approach and Weibull statistics. The SiC particle failure (including particle debonding and cracking) during deformation have been considered in the model. It has been shown that yield stress of the composites increases with the volume fraction of the SiC particles, but it decreases with the size of the SiC particles. Several types of aluminum alloys, including industry pure aluminum, Al-Mg-Si alloy, Al-Cu-Mg alloy and Al-Zn-Mg alloy, have been chosen as the matrix materials to verify the model accuracy. The comparison between the model predictions and the experimental counterparts indicated that the prediction of the present developed constitutive model agrees much better with the experimental data than the traditional modified shear lag model, which indicated that particle failure has important effect on the yield stress of the SiC reinforced aluminum alloy composites.

宋旼

材料科学金属学、热处理

SiC/Al复合材料屈服应力载荷转移Weibull统计

SiC/Al compositesyield stressload transferringWeibull statistics

宋旼.颗粒失效对SiC增强铝基复合材料屈服应力的影响[EB/OL].(2009-04-28)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/200904-847.点此复制

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