基于热力学的HTPB/AP复合底排药损伤本构模型及损伤差异分析

doi:10.7527/S1000-6893.2020.23855

固体力学与飞行器总体设计

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基于热力学的HTPB/AP复合底排药损伤本构模型及损伤差异分析

武智慧¹, 牛公杰², 钱建平¹, 刘荣忠¹

1. 南京理工大学机械工程学院, 南京 210094;
2. 中国工程物理研究院总体工程研究所, 绵阳 621999

收稿日期:2020-01-29 修回日期:2020-03-21 发布日期:2020-04-25
通讯作者: 钱建平 E-mail:13951837475@139.com
基金资助:
国家自然科学基金（11402248）

Thermodynamics-based damage constitutive model and its application to damage analysis for HTPB/AP composite base bleed grain

WU Zhihui¹, NIU Gongjie², QIAN Jianping¹, LIU Rongzhong¹

1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, China

Received:2020-01-29 Revised:2020-03-21 Published:2020-04-25
Supported by:
National Natural Science Foundation of China (11402248)

摘要/Abstract

摘要： 为研究HTPB/AP复合底排药（CBBG）单轴拉伸力学性能，进行了准静态（233~301 K，8.3×10^-5~8.3×10^-1 s^-1）和冲击（233~323 K，1 200~8 000 s^-1）加载实验。实验结果表明，各工况下的真应力应变曲线均有明显的屈服点，初始模量、屈服应力及后屈服阶段形态均呈现显著的温度和应变率相关性。在不可逆热力学框架内，推导了热力学力表达式和内变量演化法则，结合初始模量和屈服应力模型，建立了黏弹-黏塑-损伤本构模型。根据HTPB/AP CBBG宽泛温度和应变率实验数据，利用一维形式的本构模型进行了参数辨识和模型验证。结果表明，该模型能较准确描述黏弹性阶段和后屈服阶段。不同工况下的损伤演化律表明，冲击加载和低温均有利于损伤扩展。

关键词: HTPB/AP复合底排药, 热力学, 拉伸力学性能, 黏弹性, 黏塑性, 损伤演化, 本构模型

Abstract: To investigate tensile mechanical properties of HTPB/AP Composite Base Bleed Grain (CBBG), quasi-static (233-301 K, 8.3×10^-5-8.3×10^-1s^-1) and impact (233-323 K, 1 200-8 000 s^-1) loading experiments are conducted. Results show that the true stress-true strain curve has an obvious yield point under each experimental condition. The initial modulus, yield stress and the shape of the post-yield region of true stress-true strain curves all present clear dependence on temperature and the strain rate. In the framework of irreversible thermodynamics, the expressions of thermodynamic forces and evolution laws of internal variables are derived. With the additional initial modulus and the yield stress models, a novel viscoelastic-viscoplastic constitutive model considering damage evolution is proposed. Based on experimental data, the one-dimensional version of the constitutive model is used to identify the material parameters. The model validation shows that the proposed model can accurately present the initial viscoelasticity and post-yield behaviors of HTPB/AP CBBG over a wide range of temperature and strain rates. Damage evolution laws indicate that both the impact loading and low temperature boost damage development.

Key words: HTPB/AP composite base bleed grain, thermodynamics, tensile mechanical properties, viscoelasticity, viscoplasticity, damage evolution, constitutive model

中图分类号:

武智慧, 牛公杰, 钱建平, 刘荣忠. 基于热力学的HTPB/AP复合底排药损伤本构模型及损伤差异分析[J]. 航空学报, 2021, 42(3): 223855-223855.

WU Zhihui, NIU Gongjie, QIAN Jianping, LIU Rongzhong. Thermodynamics-based damage constitutive model and its application to damage analysis for HTPB/AP composite base bleed grain[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(3): 223855-223855.

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基于热力学的HTPB/AP复合底排药损伤本构模型及损伤差异分析

Thermodynamics-based damage constitutive model and its application to damage analysis for HTPB/AP composite base bleed grain

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