Experimental research on microscopic failure mechanism of the throttling ring in a gun recoil brake
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摘要: 为了研究火炮制退机节制环的故障原因和失效机理，基于金属腐蚀磨损理论和微观分析技术，综合运用光学金相显微镜分析、扫描电镜及能谱分析、显微硬度测定、电感耦合等离子体质谱法和火焰原子吸收光谱法等分析测试手段，结合报废节制环和从大修工厂待修火炮上采集的驻退液样本，从微观层面分析了节制环失效机理。研究表明，节制环作为制退机产生后坐阻力的关键部件之一，主要受到冲击磨损、化学腐蚀和气蚀破坏的复合作用而失效。Abstract: The failure mechanism of throttling rings in gun recoil brakes was experimentally researched from the micro level.In the experimental research, the scrapped throttling rings and recoil solutions from a repair facility were chosen as the research objects.The experimental research was carried out on the basis of metal corrosion abrasion theories and microscopic analysis technologies.The microscopic analysis technologies involved a metallurgical microscope, a scanning electron microscopy and an energy dispersive spectrometer, as well as micro-hardness measurement, inductively coupled plasma mass spectrometry and flame atomic absorption spectrometry.The above research shows that as one of vital components in a recoil brake, the failure of the throttling ring results from the combined action of impact wear, chemical corrosion and cavitation damage.
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Key words:
- solid mechanics /
- failure mechanism /
- microscopic analysis /
- throttling ring /
- recoil brake /
- impact wear
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表 1 驻退液内的金属元素含量
Table 1. Metal element contents within the recoil solution
驻退液 ω/10-6 Fe Cu Mn Zn Al Cr 新 0.493 0 0.059 1 0.014 5 0.107 0 0.501 0.005 1 3.482 8 0.367 9 0.073 6 1.456 9 3.527 0.021 2 4.912 2 6.159 7 0.086 4 3.623 6 2.869 0.019 3 3.611 8 5.976 0 0.244 5 5.188 8 3.922 0.038 4 2.415 0 2.096 9 0.290 6 3.051 7 1.572 0.009 5 1.221 8 3.255 4 0.095 6 2.883 1 2.103 0.025 
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