粘接模式对温度载荷发动机药柱力学响应影响仿真分析
Simulation Analysis on Influence of Bonding Mode on Mechanical Response of Engine Grain under Temperature Load
张云 1杜韩东 1谢兰川 1王竟成 1滕玉凤 1张浩明1
作者信息
- 1. 西南技术工程研究所,重庆 400039
- 折叠
摘要
目的 仿真分析温度载荷环境下固体发动机药柱的力学响应,为药柱与壳体粘接模式方案优选提供指导.方法 利用瞬态热力耦合数值模拟方法,对考虑药柱黏弹性本构性的缩比件模型进行仿真计算并试验验证,将验证后的模拟方法应用于全尺寸装药结构力学响应数值计算,分析不同药柱与壳体粘接模式装药结构在不同温度载荷环境下的应力应变变化情况.结果 不同尺寸缩比件模型的模拟计算结果与试验测量值的误差均小于8%,且试验前后探伤未发现药柱异常,试验与计算结果吻合.侧面加底部粘接模式的全尺寸装药结构的药柱在3 种温度载荷环境下,von Mises应力、应变极值均大于底部粘接模式的药柱.结论 采用底部粘接模式比侧面加底部粘接模式对药柱结构完整性的安全系数有显著提高,其中低温冲击试验中底部粘接模式优势尤为明显.
Abstract
The work aims to conduct a simulation analysis on the mechanical response of solid engine grains under tem-perature load environments to provide guidance for the optimization of grain-to-case bonding mode schemes.The transient thermal-mechanical coupling numerical simulation method was used to conduct simulation calculations on the scaled-down component models considering the viscoelastic constitutive properties of grains,and conduct experimental verification.The verified simulation method was applied to the numerical calculation of the mechanical response of full-scale charge structures.The stress and strain changes of charge structures with different grain-to-case bonding modes under different temperature load environments were analyzed.In scaled-down component models of different sizes,the errors between simulated and the experi-mental measured value were less than 8%.Moreover,no abnormal grains were found by flaw detection before and after the test.The calculation results matched the test results.For the grains of full-scale charge structures with side plus bottom bonding mode under three temperature load environments,the von Mises stress and von Mises strain extremes were all greater than those of grains with bottom bonding mode.In conclusion,the safety factor of the structural integrity of the grain is significantly im-proved by adopting the bottom bonding mode compared with the side and bottom bonding mode.Among them,the advantage of the bottom bonding mode is particularly obvious in the low-temperature impact experiment.
关键词
发动机药柱/温度载荷/黏弹性/粘接模式/仿真分析/应力/应变Key words
engine grain/temperature load/viscoelastic/bonding mode/simulation analysis/stress/strain引用本文复制引用
出版年
2024
NETL
NSTL
万方数据