A visco-hyperelastic constitutive model for EPDM soft PSD of dual-pulse motors

被引：0
|
作者：
Fan X. [1 ]
Xu J. [1 ]
Chen X. [1 ]
Du H. [2 ]
Li Y. [1 ]
Zhang Z. [3 ]
机构：
[1] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing
[2] Technology Research and Development Centre, Jinxi Industries Group, Taiyuan
[3] North Automation Control Technology Institute, Taiyuan
来源：
Xu, Jinsheng (xujinsheng@njust.edu.cn) | 2018年 / Chinese Society of Astronautics卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Constitutive model; Ethylene-Propylene-Diene Monomer (EPDM); Nonlinear; Soft Pulse Separation Device (PSD); Visco-hyperelastic;
D O I：
10.7527/S1000-6893.2018.22299
中图分类号：
学科分类号：
摘要：
Ethylene-Propylene-Diene Monomer (EPDM) was used to insulate the device from heat, and resist ablation when the first pulse grain works and make the second pulse grain work reliably in the elastomeric barrier of the dual-pulse solid rocket motor. Based on the continuum mechanical theory,a hyper-viscoelastic constitutive model was proposed to describe the mechanical behavior of the EPDM soft Pulse Separation Device (PSD) under finite and nonlinear deformation condition.The model was composed of two parts: the hyperelastic part and the nonlinear viscoelastic part. The hyperelastic part was improved on the basis of the Mooney-Rivlin model to describe the hardening phenomenon in large strain; the generalized viscoelastic model was adopted for the nonlinear viscoelastic part. The traditional Prony series was replaced by the dimensionless form of the KWW equation to make it possible to predict the mechanical response in a larger strain rate range with only two parameters. The uniaxial constant rate tensile test and multi-step relaxation test were conducted with the universal material testing machine. To get the model parameters, a step fitting method was adopted. The obtained parameters were uesed to predict the remaining experimental results. The comparison result show that the model can predict well the uniaxial constant rate tensile response of the EPDM soft PSD within 800%. Finally, The experimental data in literature was used to verify that the model proposed in this paper can better predict the mechanical response under various loading conditions. © 2018, Press of Chinese Journal of Aeronautics. All right reserved.
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