利用脉冲电磁力加载的螺接/铆接接头冲击性能测试装置及力加载方法

螺接/铆接接头在航天器结构中大量应用,其抗冲击性能对整体结构的可靠性至关重要.文章基于RLC放电原理建立脉冲电磁力加载理论模型,研制了利用脉冲电磁力加载的螺接/铆接接头冲击力学性能测试装置,并针对该装置提出了直接加载和撞击加载两种加载方法——前者适用于冲击吸能较高、冲击加载应变率<150 s-1的中应变率冲击测试,后者...

Device and driving method for testing impact property of bolted/riveted joints by using pulsed electromagnetic force

The bolted/riveted joints are widely used in spacecraft structures, and their impact resistance is vital for the safety of the whole structure. This paper builds a theoretical model of the electromagnetic force driving based on the RLC circuit, and a system for testing the impact property of bolted/riveted joints. Two loading methods are proposed, namely, the direct loading and the impact loading. The former is suitable for medium strain rate impact test with high impact energy absorption and a strain rate of less than 150 s-1 under the impact loading, while the latter is suitable for medium strain rate impact tests with a low impact energy absorption and a strain rate of less than 500 s-1 under the impact loading. The device and the method are tested and verified. It is shown that the device and the method can be used to test the impact mechanical properties of joints under medium- and-low strain rate loading with the advantages of small volume and low cost. The result of the study can be applied to the assessment and the optimization of the impact properties of spacecraft joining structures.