【摘要】 为改善Ti45Nb铆钉紧固飞机碳纤维增强复合材料(CFRP)结构时的连接性能,拓宽普通铆钉的适用紧固范围,降低铆接成本,提高连接强度,引入了脉冲电流来辅助压铆。设计了电流前处理辅助铆接试验和同步电流处理辅助铆接试验,围绕两种新工艺及其与常规铆接工艺之间的紧固质量与特性展开了对比研究。测试了不同工艺下铆钉截面的典型硬度,对比观测了铆钉不同区域的微观金相与组织成分,分析了电流导致微观组织差异及元素成分区别的原因,最后评估了不同接头的拉伸强度与破坏行为,测试结果验证了电流辅助铆接工艺的有效性与可行性。更多还原

【Abstract】 In order to improve the connection performance of Ti45 Nb rivets when fastening aircraft carbon fiber reinforced polymer(CFRP) structures, broaden the applicable fastening range of ordinary rivets, reduce riveting costs and increase connection strength, the pulse currents were introduced to assist press riveting. The current pre-treatment assisted riveting test and the synchronous current treatment assisted riveting test were designed, and then the fastening quality and characteristics of two new riveting processes were compared with those of conventional riveting processes. The typical hardnesses in the cross sections of rivets were tested under different processes. The microscopic metallography and structure composition of the different areas of the rivets were compared and observed. The reasons for difference in the microstructure and element composition caused by the currents were analyzed. Finally, the tensile strength and failure behavior of different joints were evaluated, and the results proved the effectiveness and feasibility of the current assisted riveting processes.更多还原