Abstract:  Copper alloy netting has natural bacteriostasis and corrosion resistance to make up for the shortcomings of traditional netting. However, due to the assembly corners, the local stress concentration of copper alloy netting structure will be caused, thus reducing its fatigue performance. Aiming at the fatigue damage and failure problem of copper alloy netting structure, its ultimate strength and fatigue performance are studied by test method. The fatigue life and failure modes of copper wire and copper alloy netting structure under different loads are analyzed, and the respective fatigue life S-N curves are drawn. Meanwhile, considering the influence of machining corners and assembly process, the stress concentration factor caused by machining corners is analyzed numerically, and the fatigue performance of copper alloy netting structure is re-evaluated by notch stress method. The results show that the fatigue strength of the copper alloy netting structure considering the influence of machining corners only accounts for 6% of the ultimate strength. Reasonable corner machining and assembly process is an effective means to improve the fatigue strength of the copper alloy netting structure.
 

Key words:  netting structure, marine structure, ultimate strength, fatigue test

摘要： 铜合金网衣具有的天然抑菌性、抗腐蚀性弥补了传统网衣的不足，但由于存在装配拐角，会引起铜合金网衣结构局部的应力集中，从而降低其疲劳性能。针对铜合金网衣结构的疲劳损伤失效问题，采用试验方法系统研究其极限强度和疲劳性能，分析不同载荷下铜线和铜合金网衣结构的疲劳寿命及破坏模式，并绘制出各自的疲劳寿命S-N曲线。同时，考虑到加工拐角和装配工艺的影响，对加工拐角引起的应力集中系数进行数值分析，并采用切口应力法对铜合金网衣结构的疲劳性能进行重新评估。研究表明，考虑加工拐角影响的铜合金网衣结构的疲劳强度值仅占其极限强度值的6%，合理的拐角加工工艺和装配工艺是提高铜合金网衣结构疲劳强度的有效手段。

关键词: 网衣结构, 海洋结构, 极限强度, 疲劳试验