| 陈佳聪1， 哈嘉琪2， 陈虹港3， 姬茹一3， 薛小龙4， 张科城1, 苏文献1*.高压活塞式蓄能器疲劳特性[J].轻工机械,2025,43(6):25-31 |
| 高压活塞式蓄能器疲劳特性 |
| Fatigue Performance of High Pressure Piston Type Accumulator Pressure Vessels |
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| DOI：10.3969/j.issn.1005 2895.2025.06.004 |
| 中文关键词: 活塞式蓄能器 疲劳失效机制 断口分析法 34CrMo4合金钢 压力循环试验 |
| 英文关键词:活塞式蓄能器 疲劳失效机制 断口分析法 34CrMo4合金钢 压力循环试验 |
| 基金项目:上海市市场监督管理局科技项目（2023 45）。 |
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| 中文摘要: |
| 为探究34CrMo4材料的活塞式蓄能器的疲劳特性，课题组通过对 34CrMo4 合金钢进行力学性能试验和疲劳试验获取材料参数及疲劳曲线，按GB/T 20663—2017第Ⅰ类方法进行整机疲劳试验，并对断口依次开展宏观检查、金相组织分析、硬度检测以及微观形貌分析。结果表明：缸筒材料的非金属夹杂物质量分数和力学性能符合标准，金相组织无异常；活塞式蓄能器在30 256次压力循环时在缸筒内侧第1牙螺纹处发生疲劳断裂，断口呈典型疲劳断裂特征，推测系螺纹处在交变载荷作用下萌生疲劳裂纹并扩展导致的机械疲劳失效。该研究为活塞式蓄能器寿命预测及标准完善提供了数据参考。 |
| 英文摘要: |
| In order to explore the fatigue performance of 34CrMo4 material in piston type accumulators, the research team conducted mechanical property tests and fatigue tests on the 34CrMo4 alloy steel to obtain material parameters and fatigue curves. The fatigue test of the whole machine was carried out according to Method Ⅰ of GB/T 20663—2017, and macroscopic inspection, metallographic structure analysis, hardness test and metallographic analysis were sequentially conducted on the fracture. The results show that the mass fraction of non metallic inclusions and mechanical properties of the cylinder material meet the standards, and the metallographic structure is normal. The piston accumulator suffered fatigue fracture at the first thread on the inner side of the cylinder after 30 256 pressure cycles, and the fracture has typical fatigue fracture characteristics. It is inferred that the failure is a mechanical fatigue failure caused by the initiation and propagation of fatigue cracks at the thread under alternating loads. This study provides data reference for the life prediction of piston accumulators and the improvement of standards. |
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