Evaluation of the load-bearing reliability of a double-layer flexible joint in wide-temperature-range use environment

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-04-09 DOI:10.1016/j.engfailanal.2025.109585

Wenzhi Liu , Rongtian Yu , Zhiqi Wang , Liqi Gao , Weiguo Li

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引用次数: 0

Abstract

The double-layer flexible joint (DLFJ) is the main component of the solid rocket motor thrust vector control system for transmitting motion and load-bearing. To meet the use requirements under the working pressure of 15 MPa in a wide temperature range between −40 °C and 60 °C, a DLFJ with an installation angle of 90° was designed in this paper. The specimen-elastomer parts (EPs) of the DLFJ composite rubber materials were processed for simulation experiment and mechanical property testing experiments featuring a wide-temperature-range use environment and thereby ensured safe bearing performance. Based on continuum phenomenological theory, the constitutive model parameters that characterize the mechanical properties of composite rubber materials for joint EPs in a wide-temperature-range use environment were calculated, and the constitutive model of the material in different-temperature use environments was established. The system load-bearing swing experiment, and the system finite element model was established. The update Lagrangian structural dynamics finite element calculation method, which couples material nonlinearity, internal contact constraint nonlinearity of the joint, and large deformation geometric nonlinearity, was used to calculate and analyze the influence mechanism of material properties changes on the load-bearing safety performance of DLFJ, and predict the failure temperature and failure mode of the joint. The functional function was determined based on the predicted failure mode. The reliability index method, which corresponds precisely to the functional function, was used to calculate the reliability of the DLFJ structure under continuous variables that are normally distributed in the wide-temperature-range use environment. Finally, the load-bearing reliability of the DLFJ in a wide-temperature-range use environment was preliminarily verified through the stamping swing experiment of the system prototype.

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双层柔性接头在宽温度范围使用环境下的承载可靠性评估

双层柔性关节（DLFJ）是固体火箭发动机推力矢量控制系统中用于传递运动和承载的主要部件。为满足- 40℃~ 60℃宽温度范围内工作压力为15 MPa的使用要求，本文设计了安装角为90°的DLFJ。对DLFJ复合橡胶材料的试样弹性体件（EPs）进行了模拟实验和力学性能测试实验，具有宽温度范围的使用环境，确保了安全的承载性能。基于连续统现象学理论，计算了表征接缝EPs复合橡胶材料在宽温度范围使用环境下力学性能的本构模型参数，建立了不同温度使用环境下材料的本构模型。对系统进行了承重摆动实验，并建立了系统有限元模型。采用耦合材料非线性、接头内部接触约束非线性和大变形几何非线性的更新拉格朗日结构动力学有限元计算方法，计算分析了材料性能变化对DLFJ承载安全性能的影响机理，并预测了接头的破坏温度和破坏模式。根据预测的失效模式确定功能函数。采用与函数函数精确对应的可靠度指标法，计算了宽温度范围使用环境中连续变量正态分布下DLFJ结构的可靠度。最后，通过系统样机的冲压摆动实验，初步验证了DLFJ在宽温度范围使用环境下的承载可靠性。

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

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.