疲劳失效构件可靠性强化试验仿真

Simulation and Research of Reliability Enhancement Testing about Fatigue Failure Component

针对传统可靠性试验所需时间长的问题,在炮闩可靠性评估中引入激发的机制,对失效机理为疲劳失效的闩体挡杆进行可靠性强化试验。基于ADAMS建立了炮闩的虚拟样机,模拟挡杆实际工作状态,分析得到了在正常工况和强化试验条件下挡杆受力载荷谱。在Patran中对挡杆进行"准静态"有限元分析,得到了静态应力分布。依据载荷谱和应力分布,在Fatigue中计算得到了挡杆的疲劳寿命。试验表明强化试验技术可行,有利于缩减可靠性试验的时间。

The time need in traditional reliability testing is long, so stimulation is introduced in reliability evaluation about breech. Apply reliability enhancement testing to the stop lever whose failure mechanism is fatigue failure. The virtual prototype of the whole breech is established based on the simulation software ADAMS, in order to simulate the practical active state of the stop lever. The contact load spectrums are obtained under both normal and enhancement testing conditions. The stress result is gotten after its finite element analysis with quasi-static method in Patran. According to the load spectrums and stress result, the life of stop lever is gained under calculation in Fatigue. The testing shows that the enhancement testing technology is feasible, and able to reduce the time of reliability testing.