摘要
针对导弹舱段连接部位在运输勤务荷载下的结构完好性评估问题,提出了一种舱段连接部位套筒连接结构的模拟方案,以准确模拟铆钉的受力。在此基础上,采用基于应力功率谱的疲劳寿命评估方法,对铆钉进行了疲劳寿命预测。研究结果表明,外荷载激起了弹体的横向一阶弯曲模态与一阶纵向模态,其中纵向荷载对铆钉的动应力贡献较大,左右两侧铆钉的疲劳寿命小于上下两侧,同组3个铆钉中,中间铆钉疲劳寿命较大,所有铆钉的疲劳寿命均达到了无限寿命设计要求。
To ensure the structural integrity of missile cabin connections under transportation loads, a novel scheme was proposed to accurately simulate the rivets connections between two cabins of a missile. The power spectral density of stress was calculated from the stochastic analysis, based on which the fatigue life of the rivet connections was evaluated. Results show that the first vertical bending mode and the first longitudinal mode are excited during transportation. The longitudinal excitation forces make greater contribution to the dynamic stress of rivet connections. The fatigue life of the rivets at the left and right sides are shorter than that at the up and down sides. In each group of three rivets, the fatigue life of the sideward ones is shorter than the middle one. All rivets fulfill the infinite life requirements of design.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2013年第3期419-422,426,共5页
Journal of Solid Rocket Technology
基金
国家自然科学基金(10902024)
教育部新世纪优秀人才支持计划(NCET-11-0086)
江苏省自然科学基金(BK2010397)
航空科学基金(20090869009)
江苏省普通高校研究生科研创新计划项目(CXZZ13-0084)
关键词
弹体运输
舱段连接
铆钉建模
疲劳寿命
missile transportation
cabin connection
rivet modeling
fatigue life evaluation
