Simulation Analysis on Influence of Bonding Mode on Mechanical Response of Engine Grain under Temperature Load
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.
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