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建立了高体积分数S iCP/A l复合材料的微缺陷有限元模型,对其拉伸力学特性进行了模拟计算。通过对含孔洞、界面脱粘等典型微缺陷的模拟,发现孔洞的存在对材料性能影响不大;界面脱粘对材料承载性能影响最大,脱粘界面面积的大小与复合材料承载能力成反比。微缺陷之间的相对位置对材料拉伸性能的影响不同,靠近孔洞处界面脱粘比背离孔洞处界面脱粘使材料承载性能下降更大。进一步多颗粒模型的模拟分析,发现高体积分数S iCP/A l复合材料的非线性拉伸曲线与其内部颗粒界面逐步脱粘存在有一定的关系。在开始加载阶段脱粘比例递增较快,在接近破坏时脱粘比例递增减慢。
The micro-defect finite element model of high volume fraction S iCP / Al composite was established and its tensile mechanical properties were simulated. Through the simulation of typical micro-defects such as voids and interface debonding, it is found that the existence of voids has little effect on the material properties. The debonding of the interface has the most influence on the material bearing capacity, and the size of the debonding interface is inversely proportional to the bearing capacity of the composite. The relative position between the micro-defects has different effects on the tensile properties of the material, the debonding near the hole at the interface is more debonded than the debonding at the interface departing from the hole, so that the bearing capacity of the material is greatly reduced. After further simulation of multi-particle model, it is found that the nonlinear tensile curve of high volume fraction S iCP / A l composite has a certain relationship with the gradual debonding of its internal particle interface. At the beginning of the loading phase, the percentage of de-bonding increased rapidly, and the percentage of de-bonding increased slowly at the close of the damage.