Csf/Al复合材料热压缩变形力学行为的数值模拟

The finite element simulation of mechanical behavior in hot compression for Csf/Al composite materials

与长碳纤维增强铝基复合材料相比,短碳纤维增强铝基复合材料的最大优点是可以进行二次塑性加工。在复合材料塑性加工中,加工工艺参数对复合材料性能的影响很大。然而由于复合材料界面结构、成分的复杂性和微观性,实验研究无法给出定量的细节过程描述。文章借助数值模拟手段,全面细致地模拟了变形量、温度对复合材料塑性加工的影响,研究了塑性加工时复合材料的应力应变分布规律。实验结果表明,塑性加工时应变主要集中在纤维端部附近,全面进入屈服后纤维的受力随变形量的增加而缓慢增加,变形温度越高,纤维与界面的受力越小,变形越均匀,对保持纤维的长度和界面的性能越有利。

Compared to the long fiber reinforced Al-base composite materials, the first advantage of short fiber reinforced Al-base composite materials is that it can be processed further plastic working. Among the plastic working of composite materials, the processing parameters have a large influence on the properties of the composite materials. However, the quantitative and detail descriptions can＇t be given by experimental research due to the interface structure, complexity of component and microstructure of the materials. In the paper, the finite element measure is used to simulate the influences of deformation ratio and deformation temperature on the plastic working~ the strain-stress distribution law for the materials has been studied in the plastic processing. The results show that the strain is mainly focused on the nearby end face of the fiber; moreover the force on the fiber slowly in- creased with the increasing of deformation ratio when the materials are all in the yield state. With the increasing of deformation temperature, the lower force of the fiber and the interface, the more uniform of the deformation, which is benefit for the length of the fiber and the properties of the interface. The results have been approved by test.