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.
solid enginevertical storagetime-temperature-stress equivalence principlecreep prediction modelfinite element analysis
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