EXAMINATION ON THE RIGID-PLASTIC MESO-DAMAGE CONSTITUTIVE THEORY FOR PARTICLE REINFORCED COMPOSITES
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摘要: 验证已建立的刚性颗粒增强复合材料刚塑性细观损伤本构理论的合理性和可靠性。将上述本构理论的数值计算结果与SiC颗粒增强的铝基复合材料单轴拉伸实验结果进行比较。结果表明:由此本构模型得到的应力-应变理论曲线与拉伸实验所得的应力-应变曲线基本吻合,从而验证了该本构模型的合理性和可靠性。因此已建立的刚塑性细观损伤本构模型可用于数值计算,在一定程度上可预测颗粒增强复合材料的力学特性。在此基础上对大、小颗粒增强复合材料的延展性、空洞和颗粒体积分数演化规律等作了讨论。Abstract: The reasonability and reliability of a rigid-plastic meso-damage constitutive theory were examined for porous composites reinforced by rigid particles. The numerical calculations based on the constitutive theory were compared with the tensile experiments on Al matrix composites reinforced by SiC particles. The results show that the constitutive theory agrees with the experimental stress-strain curves, so this constitutive theory can be put into numerical simulation and predict the mechanics properties of the composites reinforced by rigid particles. Based on the above, the ductility and evolution law for void and particles were discussed in this paper.
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