长期立贮固体发动机药柱变形预估方法研究
Deformation Prediction Method of Engine Grain under Long-term Vertical Storage
彭湃 1陈家兴 2樊自建 3邓旷威3
作者信息
- 1. 长沙理工大学 土木工程学院,长沙 410015;国防科技大学 空天科学学院,长沙 410073;空天任务智能规划与仿真湖南省重点实验室,长沙 410073
- 2. 内蒙动力机械研究所,呼和浩特 010010
- 3. 国防科技大学 空天科学学院,长沙 410073;空天任务智能规划与仿真湖南省重点实验室,长沙 410073
- 折叠
摘要
目的 研究老化与颠振影响下长期立式贮存固体发动机药柱的蠕变特性,基于广义Kelvin模型,构建一种考虑老化和损伤因素的蠕变本构模型.方法 通过开展温度与应力加速蠕变试验、高温加速老化试验以及往复拉伸损伤试验,获得老化与损伤对蠕变的影响规律,建立蠕变预测模型,获取模型参数,并将其嵌入有限元软件.结果 利用所得蠕变本构模型计算了某型发动机立式贮存15 a后药柱蠕变的应力应变,结果表明,考虑老化因素后,发动机药柱的最大等效应力增大了 96.84%,最大等效应变减小了 4.07%,在同时考虑老化与损伤因素后,最大等效应力增加了82.77%,最大等效应变减小了 3.62%.结论 对比不同条件下的仿真结果,老化和损伤对发动机蠕变状态的影响较大.使用该模型能够较好地体现出固体发动机药柱的老化硬化和损伤软化.
Abstract
The work aims to study the creep characteristics of long-term vertically stored solid engine grain under the influ-ence of aging and knocking,and establish a creep constitutive model considering aging and damage factors based on the gener-alized Kelvin model.The creep test accelerated by temperature and stress,high temperature accelerated aging test and recipro-cating tensile damage test were carried out to obtain the influence law of aging and damage on creep.The creep prediction model was established,the model parameters were obtained and embedded into the finite element software.The stress and strain of the engine grain creep after 15 years of vertical storage were calculated by the obtained creep constitutive model.The simula-tion results showed that the maximum effective stress of the engine grain increased by 96.84%and the maximum effective strain decreased by 4.07%after considering the aging factor.After considering both the aging and damage factors,the maximum ef-fective stress increased by 82.77%and the maximum effective strain decreased by 3.62%.Compared with the simulation results under different conditions,aging and damage have great influence on the creep state of the engine.The use of this model can better reflect the aging hardening and damage softening of solid engine grain.The established model and the method used can provide reference for the structural integrity analysis of long-term vertically stored engines.
关键词
固体发动机/立式贮存/时间-温度-应力等效原理/蠕变预测模型/有限元Key words
solid engine/vertical storage/time-temperature-stress equivalence principle/creep prediction model/finite element analysis引用本文复制引用
基金项目
湖南省研究生科研创新项目(CX20230059)
出版年
2024
NETL
NSTL
万方数据