刘勇, 倪莉, 张挺, 许佳焱, 马勤超, 周旭, 毛锡非, 顾龙佳. 耐热双头螺柱断裂分析[J]. 失效分析与预防, 2019, 14(5): 312-314, 327. DOI: 10.3969/j.issn.1673-6214.2019.05.005
    引用本文: 刘勇, 倪莉, 张挺, 许佳焱, 马勤超, 周旭, 毛锡非, 顾龙佳. 耐热双头螺柱断裂分析[J]. 失效分析与预防, 2019, 14(5): 312-314, 327. DOI: 10.3969/j.issn.1673-6214.2019.05.005
    shu
    LIU Yong, NI Li, ZHANG Ting, XU Jia-yan, MA Qin-chao, ZHOU Xu, MAO Xi-fei, GU Long-jia. Fracture Failure Analysis of Heat-resistant Stud[J]. Failure Analysis and Prevention, 2019, 14(5): 312-314, 327. DOI: 10.3969/j.issn.1673-6214.2019.05.005
    Citation: LIU Yong, NI Li, ZHANG Ting, XU Jia-yan, MA Qin-chao, ZHOU Xu, MAO Xi-fei, GU Long-jia. Fracture Failure Analysis of Heat-resistant Stud[J]. Failure Analysis and Prevention, 2019, 14(5): 312-314, 327. DOI: 10.3969/j.issn.1673-6214.2019.05.005
    shu

    耐热双头螺柱断裂分析

    Fracture Failure Analysis of Heat-resistant Stud

      摘要
    • 摘要: 耐热双头螺柱在柴油机台架进行耐久试验时发生断裂。通过对断裂螺柱进行宏观检查、断口扫描、金相检测、化学成分分析、硬度检测，并进行模拟装配试验，确定螺柱断裂性质。结果表明：螺柱的断裂性质为高周低应力疲劳断裂；螺柱本身在运行过程中受力较小，但螺纹牙底存在的折叠缺陷加剧了牙底的应力集中，成为疲劳裂纹的起源，并在交变载荷作用下不断扩展，导致最终失稳断裂。

       

      Abstract: A heat-resistant stud fractured during the endurance test of diesel engine platform. Based on macro observation and fracture scanning, metallographic examination, chemical composition analysis, hardness test and simulation experiment, the fracture mechanism and cause were found. The results show that the failure mode of the stud is fatigue fracture under high cycle and low stress. In the process of operation, the force on the stud itself is small, but the folding defect of the screw bottom aggravated the stress concentration of the tooth bottom, leading to the initiation of fatigue crack. The fatigue crack propagated under the alternating load, leading to the ultimate fracture.

       

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