Shear creep and failure model of bonded interface in solid rocket motors

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-09-16 DOI:10.1016/j.ast.2025.110915

Guanlin Ye , Haitao Sun , Kuangwei Deng , Dan Wu , Zhiqiang Zhang

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引用次数: 0

Abstract

During vertical storage, the bonded interface of solid rocket motors (SRMs) is susceptible to gravity-induced shear creep, which can lead to debonding, cracking, and other damage that compromise the structural integrity and service life of SRMs. Focusing on the creep damage problem in vertically stored SRMs, this study utilizes simulation methods to analyze the stress-strain response of the bonded interface, and the results indicate that, under the combined effects of curing cooling and gravity loading, the interfacial shear stress in the head debonding area of vertical storage motors can be up to 0.3 MPa, and there is a risk of inducing creep damage. Based on this result, shear creep tests were conducted on the bonded interface under applied stresses ranging from 0.1 MPa to 0.85 MPa. The experimental results revealed interfacial shear failure occurs when the shear stress exceeds a critical threshold of 0.5 MPa. A shear creep model for the bonded interface was developed that can simultaneously characterize viscoelastic creep and progressive damage behavior by integrating a crack propagation element into the improved Burgers model. Model validation demonstrates that the fitting error is kept below 6.3 % during the non-destructive stage and does not exceed 11.9 % during the destructive stage, effectively achieving accurate characterization of the entire process from interfacial creep damage to failure.

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固体火箭发动机粘结界面剪切蠕变及破坏模型

在垂直储存过程中，固体火箭发动机粘结界面容易受到重力诱导的剪切蠕变，从而导致脱落、开裂和其他损害，从而影响固体火箭发动机的结构完整性和使用寿命。针对垂直存储电机的蠕变损伤问题，采用仿真方法分析了粘结界面的应力-应变响应，结果表明，在固化冷却和重力载荷的共同作用下，垂直存储电机头部脱粘区界面剪应力可达0.3 MPa，存在诱发蠕变损伤的风险。在此基础上，在0.1 ~ 0.85 MPa的应力范围内对粘结界面进行了剪切蠕变试验。实验结果表明，当剪切应力超过0.5 MPa的临界阈值时，界面发生剪切破坏。通过将裂纹扩展单元集成到改进的Burgers模型中，建立了粘结界面的剪切蠕变模型，该模型可以同时表征粘弹性蠕变和渐进损伤行为。模型验证表明，在非破坏阶段，拟合误差保持在6.3%以下，在破坏阶段，拟合误差不超过11.9%，有效地实现了从界面蠕变破坏到破坏的整个过程的准确表征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.