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高速缓冲液压缸内表面裂纹扩展特性研究

Study on Inner-Surface Crack Propagation Characteristics of High-Speed Buffer Hydraulic Cylinder

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【作者】 田鹏飞马云瑞赵永峰陈江义

【Author】 TIAN Pengfei;MA Yunrui;ZHAO Yongfeng;CHEN Jiangyi;School of Mechanical and Power Engineering, Zhengzhou University;Electric Power Research Institute of State Grid Henan Electric Power Company;

【通讯作者】 陈江义;

【机构】 郑州大学机械与动力工程学院国网河南省电力公司电力科学研究院

【摘要】 由于制造缺陷、疲劳及腐蚀等原因,缓冲液压缸在服役过程中内壁会产生轴向裂纹,严重影响液压缸的结构强度、缓冲性能和使用寿命。通过AMESim液压仿真平台建立缓冲系统模型来模拟实际工况,将缓冲油压作为有限元分析的初始载荷,建立缓冲缸有限元模型和裂纹扩展模型,研究不同初始裂纹形状、裂纹位置对疲劳寿命的影响,并分析裂纹前缘动态应力强度因子和裂纹形貌的变化。结果表明:无缺陷的油缸完全能承受缓冲压力;裂纹初始长度一定时,随着深长比增大,裂纹前缘应力强度因子会整体增大,裂纹扩展速度加快;不同深长比的初始裂纹经过多次循环载荷后都更倾向于在长度方向快速扩展;缸体内不同位置的裂纹疲劳寿命存在较大差异,在壁厚较小的边角位置,疲劳裂纹扩展寿命最短。

【Abstract】 Due to the manufacturing defects, fatigue and corrosion, the inner wall of the buffer hydraulic cylinder will produce axial cracks during the service process, which seriously affect the structural strength, buffer performance and service life of the hydraulic cylinder.The buffering system model was established by AMESim hydraulic simulation platform to simulate the actual working condition, and the buffering oil pressure was taken as the initial load for finite element analysis.The finite element model and crack growth model of buffer cylinder were established to study the effects of different initial crack shapes and crack locations on the fatigue life, and the dynamic stress intensity factor and crack morphology of crack front were analyzed.The results show that the cylinder without defects can fully withstand the buffer pressure.When the initial crack length is fixed, the leading edge stress intensity factor will increase and the crack growth speed will be accelerated with the increase of the depth-length ratio.The initial cracks with different depth-length ratios tend to propagate faster in the length direction after multiple cyclic loading.The fatigue life of cracks is different at different positions in cylinder, and the fatigue life of cracks is the shortest at the corner position with small wall thickness.

【基金】 国网河南省电力公司电力科学研究院项目(SGHADK00DYJS2100546)
  • 【文献出处】 机床与液压 ,Machine Tool & Hydraulics , 编辑部邮箱 ,2024年11期
  • 【分类号】TH137.51
  • 【下载频次】13
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