针对单室双推力发动机装药在低温点火工况下结构完整性,为了求解损伤的热粘弹性有限元模型,采用增量有限元方法,获取了装药内部的应力应变场。研究表明,在固化降温时,人工脱粘层对装药头部与尾部起到应力释放的作用,避免了装药与绝热层界面的破坏;同时,装药内部Mises应力值较大的部位是过渡段翼尖处与圆柱段表面。在点火时刻,装药环向应变的值较大部位是圆柱段表面。最后,采用文中方法,可应用于指导发动机装药设计与安全评估。

For the structural integrity of single chamber dual thrust engine charge under low temperature ignition condition, using incremental finite element method to solve the finite element model of thermal viscoelastic damge, the stress-strain field of internal charge was obtained. Research showed that in curing temperature, artificial debond layer had stress release effect on the head and tail of charge, to avoid the interface between the charge and the insulation layer. Meanwhile, the part which had larger Mises stress value charge was the parts of the wingtip transition and cylindrical surface. At the ignition time, the part which had large value of the charge hoop strain was the surface of the cylinder section. Finally, this method could be used to guide the design and safety evaluation of engine charge.