Mechanism of initiation and propagation of surface cracks in gun bore under thermomechanical coupling impact

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-10-01 DOI:10.1016/j.csite.2024.105194

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Abstract

Surface cracks in gun bore may exacerbate rifling ablation and wear and in turn shorten barrel life. Thermomechanical coupling finite element (FE) models of bore are established and the dynamic responses of the bore under high-temperature and high-pressure are numerically simulated. The stress distribution characteristics on the inner surface are analyzed and the effects of autofrettage, number of firings and harden layer on the stress distribution are discussed. Based on the stress distribution characteristics, FE models with two initial cracks on the ledge of land surface are set up and the propagation, interaction and intersection of the cracks are numerically simulated, considering the effect of the distance between the two cracks. Based on simulation results, the initiation and propagation pattern and mechanism of the cracks on the inner surface are analyzed. An ablation test system was designed and produced, and used to experimentally verify the initiation and propagation mechanism of the cracks. The observed crack patterns on the inner surface of a real gun bore are also used to illustrate the mechanism obtained in this work. Understanding of the initiation and propagation mechanism of cracks in gun bore can be applied to improve and optimize the design of barrels.

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热机械耦合冲击下炮孔表面裂纹的产生和扩展机理

枪膛表面裂纹可能加剧膛线烧蚀和磨损，进而缩短枪管寿命。本文建立了枪膛的热力学耦合有限元（FE）模型，并对枪膛在高温高压下的动态响应进行了数值模拟。分析了内表面的应力分布特征，并讨论了自动修整、发射次数和硬化层对应力分布的影响。根据应力分布特征，建立了陆地表面台阶上有两个初始裂纹的 FE 模型，并考虑了两个裂纹之间距离的影响，对裂纹的传播、相互作用和交叉进行了数值模拟。根据模拟结果，分析了内表面裂纹的起始、扩展模式和机理。设计并制作了一个烧蚀测试系统，用于实验验证裂纹的产生和扩展机制。此外，还利用在真实炮膛内表面观察到的裂纹形态来说明本研究中获得的机理。了解枪膛裂纹的产生和扩展机理可用于改进和优化枪管设计。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.