δ-Al2O3短纤维增强Al合金复合材料热残余应力及其影响
ThermalResidual Stresses and Their Effects on Properties ofδ-Al2O3 Short Fiber Reinforced AlAlloy Composites
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摘要: 用弹塑性有限元法和双纤维模型研究了δ-Al2O3短纤维增强Al合金复合材料在室温下的热残余应力的 分布及其对复合材料整体力学性能的影响.计算了体积分数为20%的3种δ-Al2O3/Al合金复合材料的拉伸应 力-应变关系,并与实验结果比较.纤维间相互作用使复合材料基体中的热残余应力的大小发生了变化,但对其 空间分布规律没有影响.对于体积分数为20%的短纤维增强δ-Al2O3/Al-5. 5 Mg和δ-Al2O3/Al-5. 5 Zn复合材 料,用双纤维模型的三维弹塑性有限元方法计算的应力-应变曲线与实验曲线符合得较好,但δ-Al2O3/Al-12 Si 复合材料的模拟结果与实验结果相比误差较大.Abstract: A double fibermodel was proposed. The distribution of thermal residual stresses inδ- Al2O3 f/Al alloy composites and the effects of thermal residual stresses on the properties of the compositeswere calculatedwith a double fibermodel and elasto-plastic finite elementmethod. Tensile stress-strain curves of threeδ-Al2O3/Al alloy composites were obtained with the effect of thermal residual stresses taken into account and compared with the experimental results. The effects between neighboring fibers result in the changes in magnitude of thermal residual stresses, but have no influence on their space distribution. Reasonable consistencywas achieved between the simulated and experimental stress-strain curves forδ-Al2O3/Al-5. 5 Mg andδ-Al2O3/Al-5. 5 Zn composites, but therewas significant error in the simulated curves comparedwith the experimental results forδ-Al2O3/ Al-12 Si composite.
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Key words:
- short fiber composite /
- thermal residual stress /
- finite element analysis
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