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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。
With large deformed Ag / Ni20 fiber composite contacts as experimental samples and scanning electron microscopy as the analysis method, according to the deformation and distribution of the internal fiber structure, a five-zone stress-strain model was established to study the effect of large deformation of metal fiber composite materials Plasticity in contact preparation. The results show that there are two kinds of deformations in the process of preparation, such as compression and extension. The stress and strain in zone 1 and the first zone of the nail head located at the nail head and nail corner are the most concentrated, which are the tensile deformation and the average deformation At 80%, cracks are easily generated. Material plasticity should meet the plastic tensile deformation requirements of these two regions, in order to prepare high-quality contacts.