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首页> 外文期刊>Journal of aerospace engineering >Role of the Material Constitutive Model in Simulating the Reusable Launch Vehicle Thrust Cell Liner Response
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Role of the Material Constitutive Model in Simulating the Reusable Launch Vehicle Thrust Cell Liner Response

机译：材料本构模型在模拟可重复使用的运载火箭推进器内衬响应中的作用

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摘要

The reusable launch vehicle thrust cell liner, or thrust chamber, is a critical component of the space shuttle main engine. It is designed to operate in some of the most severe conditions seen in engineering practice. These conditions give rise to characteristic deformations of the cooling channel wall exposed to high thermal gradients and a coolant-induced pressure differential, characterized by the wall's bulging and thinning, which ultimately lead to experimentally observed "dog-house" failure modes. In this paper, these deformations are modeled using the cylindrical version of the higher-order theory for functionally graded materials in conjunction with two inelastic constitutive models for the liner's constituents, namely Robinson's unified viscoplasticity theory and the power-law creep model. Comparison of the results based on these two constitutive models under cyclic thermomechanical loading demonstrates that, for the employed constitutive model parameters, the power-law creep model predicts more precisely the experimentally observed deformation leading to the "dog-house" failure mode for multiple short cycles, while also providing much improved computational efficiency. The differences in the two models' predictions are rooted in the differences in the short-term creep and relaxation responses.
机译：可重复使用的运载火箭推力舱衬套或推力室是航天飞机主机的重要组成部分。它旨在在工程实践中看到的某些最严酷条件下运行。这些条件导致暴露于高热梯度的冷却通道壁的特征变形和冷却剂引起的压差，其特征在于壁的鼓胀和变薄，最终导致实验观察到的“狗窝式”故障模式。在本文中，这些变形是使用功能性材料的高阶理论的圆柱形式，​​结合衬里成分的两个非弹性本构模型（即鲁滨逊统一粘塑性理论和幂律蠕变模型）来建模的。在循环热机械载荷下基于这两个本构模型的结果比较表明，对于所采用的本构模型参数，幂律蠕变模型可以更精确地预测实验观察到的变形，从而导致多次短路的“狗屋”破坏模式周期，同时还提供了大大提高的计算效率。两种模型预测的差异都源于短期蠕变和松弛响应的差异。

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