中文摘要：

针对高应变速率敏感性钛合金铆钉的成形问题,通过试验和微观分析研究加载速率对TA1铆钉钉头和钉杆变形、能量效率、铆钉与钢板及铆钉与钢板-复合材料夹层结构的连接效果的影响,讨论TA1铆钉变形区晶粒细化规律.研究结果表明,2种不同数量的加载速率均能实现TA1铆钉成形.随着加载速率提高,钉头绝热剪切带变形越显著.合适的加载速率易于实现铆钉与复合材料-钢板夹层结构良好连接.低加载速率有利于铆钉变形过程产生的热量传递到更宽的区域,推迟变形区裂纹的产生并细化晶粒,提高TA1铆钉的极限变形.

英文摘要：

For the riveting of a titanium alloy rivet with high strain rate sensitivity,effects of a loading rate on TA1 rivet deformation,energy efficiency,and the riveting joints between TA1 rivet and steel plate,TA1 rivet and laminates of a composite-steel sheet in electromagnetic riveting（EMR） were investigated through experiments and microstructure analysis.The results show that TA1 riveting can be carried out by two kinds of loading rates with different magnitudes.The increasing loading rate contributes to more remarkable deformation in the adiathermal shear zone.With an appropriate loading rate,a good riveting joint can be obtained between the TA1 rivet and laminates of the composite-steel sheet.The low loading rate of the EMR process enables the transfer of heat generated during the rivet deformation,the postponing of cracks,a fine grain in the region of rivet deformation,and the enhancement of the deformation limit of the rivets.