随机构成模型及其在 HTPB 推进剂中的应用

IF 1.7 4区 工程技术 Q3 CHEMISTRY, APPLIED
Dong‐Mo Zhou, Bu‐Qing Hui, Shao‐Bin Zhao, Hang Chen, Xiang‐Yang Liu
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引用次数: 0

摘要

针对羟基封端聚丁二烯(HTPB)推进剂力学性能的随机性问题,提出了一种具有对数正态分布随机参数Λ的随机构成模型(SCM)来描述其力学行为,并在此基础上分析了 HTPB 推进剂晶粒的结构完整性。结果表明,SCM 预测的应力-应变曲线与实验曲线具有良好的一致性,实验曲线在 SCM 预测的 95 % 的概率区间内。HTPB 推进剂晶粒在点火加压下的力学响应与随机参数Λ有关。随着随机参数Λ的增加,最大等效应力和安全系数近似线性增加,而随着随机参数Λ的增加,最大等效应变和最大损伤系数近似线性减少。基于 SCM 得到的晶粒力学响应与实验构成模型的误差基本不超过 2%,SCM 可以有效表征 HTPB 推进剂力学性能分散导致的推进剂晶粒力学响应的随机性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A stochastic constitutive model and its application to HTPB propellant
To address the issue of randomness in the mechanical properties of the hydroxyl‐terminated polybutadiene (HTPB) propellant, a stochastic constitutive model (SCM) with a lognormally distributed random parameter Λ was proposed to describe their mechanical behaviors, and the structural integrity of a HTPB propellant grain was analyzed based on it. The results indicate that the stress‐strain curves predicted by the SCM have a good agreement with the experimental curves, and the experimental curves fall within a 95 % probability interval predicted by the SCM. The mechanical response of HTPB propellant grain under ignition pressurization is associated with the random parameters Λ. The maximum equivalent stress and safety factor increase approximately linearly with the increase of random parameters Λ, while the maximum equivalent strain and maximum damage coefficient decrease approximately linearly with the increase of random parameters Λ. The error in the mechanical response of the grain obtained based on the SCM and the experimental constitutive model is basically not more than 2 %, the SCM can effectively characterize the randomness in the mechanical response of propellant grain caused by the dispersion of HTPB propellant mechanical properties.
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来源期刊
Propellants, Explosives, Pyrotechnics
Propellants, Explosives, Pyrotechnics 工程技术-工程:化工
CiteScore
4.20
自引率
16.70%
发文量
235
审稿时长
2.7 months
期刊介绍: Propellants, Explosives, Pyrotechnics (PEP) is an international, peer-reviewed journal containing Full Papers, Short Communications, critical Reviews, as well as details of forthcoming meetings and book reviews concerned with the research, development and production in relation to propellants, explosives, and pyrotechnics for all applications. Being the official journal of the International Pyrotechnics Society, PEP is a vital medium and the state-of-the-art forum for the exchange of science and technology in energetic materials. PEP is published 12 times a year. PEP is devoted to advancing the science, technology and engineering elements in the storage and manipulation of chemical energy, specifically in propellants, explosives and pyrotechnics. Articles should provide scientific context, articulate impact, and be generally applicable to the energetic materials and wider scientific community. PEP is not a defense journal and does not feature the weaponization of materials and related systems or include information that would aid in the development or utilization of improvised explosive systems, e.g., synthesis routes to terrorist explosives.
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