摘要
推进剂制造过程中药柱产生的残余应变对固体火箭发动机的安全性和稳定性有重要影响。压力固化成型技术已成为降低残余应变的有效途径。本文以连续介质力学为基础，考虑压力固化成型工艺的影响，推导了晶粒应变预测函数。通过有限元分析验证了预测函数的准确性。结果表明，该函数能准确预测晶粒内临界位置的应变分布。分析了固化压力和壳体弹性模量对残余应变的影响。具体地说，对于给定的壳体材料，确定了使颗粒中的残余应变最小化的最佳固化压力。此外，观察到具有较低环向弹性模量的材料，如复合材料，往往需要较低的最佳固化压力。研究结果为晶粒形状设计和最佳固化压力的选择提供了有价值的指导。
Abstract
The residual strain generated in grains during the propellant manufacturing process can significantly impact the safety and stability of solid rocket motors. Pressure curing molding technology has been employed as an effective approach to mitigate residual strain. This research paper focuses on deriving a strain prediction function for grains based on continuum mechanics, taking into account the influence of pressure curing molding technology. The accuracy of the prediction function is verified through finite element analysis. The results show that the proposed function accurately predicts strain distribution at critical positions within the grains. And the effects of curing pressure and the elastic modulus of the case on residual strain are analysed. Specifically, for a given material of case, an optimal curing pressure is identified that minimizes residual strain in the grains. Moreover, it is observed that materials with lower hoop elastic modulus, such as composites, tend to require lower optimal curing pressures. The outcomes of this study provide valuable guidance for grain shape design and the selection of optimal curing pressure.
NETL
NSTL
Wiley