Ag/Ni20纤维复合材料触点制备过程中的塑性变形

以大变形Ag/Ni20纤维复合材料触点为实验样品，以扫描电镜等为分析手段，根据触点内部纤维组织的变形和分布情况，通过建立5区域应力应变模型，研究大变形金属纤维复合材料触点制备中的塑性问题。结果表明，触点在制备过程中存在压缩和拉伸两种变形，位于钉头与钉角处的第3区和钉头表面的第1区应力应变最集中，为拉伸变形，平均变形量在80%，是裂纹容易产生的地方。材料塑性应满足这两个区域的塑性拉伸变形要求，才能制备出高质量的触点

Plastic Deformation of Severely Deformational Ag/Ni20 Fiber Composite Contacts during the Preparation Process

Severely deformational Ag/Ni20 fiber composite contacts were used as experimental samples and the scanning electron microscopy as the analytical manner. According to the deformation and distribution of fiber structure in contacts, the plastic problems of severely deformational metal fiber composite contacts during the preparation process were investigated by the creation of five area stress-strain models. The results indicate that both compressive deformation and tensile deformation exist during the preparation of contacts. Stress-strain is most intense in the third area which locates in the head and the corner of contact and the first area which locates in the surface of contact. Both areas suffer tensile deformation with average strain of 80%, and cracks would occur in these areas with the maximum probabilities. Contacts with high qualities could be produced if materials satisfy plastic tensile deformation in these two areas.