Prediction Method of Heterogeneous Propellant Relaxation Moduli Based on Viscoelastic VCFEM
Prediction Method of Heterogeneous Propellant Relaxation Moduli Based on Viscoelastic VCFEM
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DOI：
10.1007/s11223-021-00314-x
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发表时间：
2021-07
影响因子：
0.7
通讯作者：
L. Shen;Z. Shen;L. Zhang;H. Y. Li
中科院分区：
文献类型：
--
作者：
L. Shen;Z. Shen;L. Zhang;H. Y. Li
异质推进剂的松弛模量可以评估固体火箭发动机的结构完整性和寿命。通过Voronoi单元有限元法（VCFEM）在微观层面研究了其控制因素。粘弹性VCFEM公式基于Prony级数粘弹性本构模型在时域的离散形式；还提出了迭代过程以获得每个时间步长的有效模量。采用随机抽样的方法分析各微观参数对有效松弛模量的影响。结果表明，基体模量和夹杂物重量分数对松弛模量的影响比夹杂材料常数和颗粒晶粒的影响更显着。
The relaxation modulus of heterogeneous propellants permits evaluating the structural integrity and life of a solid rocket motor. Its governing factors were investigated by the Voronoi cell finite element method (VCFEM) at the microscopic level. The formula of viscoelastic VCFEM is based on the discrete form of the Prony series viscoelastic constitutive model in the time domain; the iterative procedure is also proposed to obtain the effective modulus at each time step. The random sampling method is adopted to analyze the effect of each microparameter on the effective relaxation modulus. The results show that the matrix modulus and inclusion weight fraction exert a more pronounced effect on the relaxation modulus than the inclusion material constants and particle grain.