船用钛、钢法兰连接螺栓的疲劳强度性能分析

Analysis of fatigue strength of titanium-steel flange connection bolts in ship

    摘要
  • 摘要:
      目的  新型舰船与钛合金球鼻艏导流罩一般采用螺栓连接，由于受艏部砰击和波浪载荷等交变载荷的影响，需要对钛、钢连接结构进行疲劳性能分析。
      方法  首先，通过有限元法对实船钛、钢连接结构进行受力分析，并对钛、钢法兰连接螺栓的应力进行计算，然后，基于疲劳累积损伤理论和S-N曲线法计算得出钛、钢连接结构的疲劳寿命，同时根据实船钛、钢连接结构的受力分析，制定与之对应的疲劳试验方案，进行钛、钢连接结构的疲劳试验。
      结果  结果表明，钛、钢连接接口螺栓的疲劳强度理论计算与试验结果基本一致，对钛、钢连接的疲劳性能分析方法合理。
      结论  所建立的钛、钢连接接口疲劳性能分析方法可为钛和钢连接的连接型式、螺栓的选型及连接结构优化提供有益的参考和借鉴。

     

    Abstract:
      Objectives   Bolt is usually used in connection for titanium alloy bulbous bow domes of new types of ships and such connection is exposed to bow slamming and wave loading, thus fatigue analysis of titanium-steel connection structure is necessary.
      Methods   The finite element method is used to make stress analysis of the titanium-steel joint for new ships, and the stresses of titanium-steel connection bolts are calculated. The fatigue cumulative damage theory and S-N curve method are used to calculate the fatigue life of titanium-steel connection. According to the stress analysis of titanium-steel connection of ship, the fatigue test plan is formulated accordingly to conduct fatigue test on titanium-steel connection.
      Results   The results show that the theoretical calculation of fatigue strength of titanium-steel connection of new type of ship is largely consistent with the test results and the method for the fatigue analysis of titanium-steel connection is reasonable.
      Conclusions   This paper established a method for research on fatigue strength of titanium-steel joint, and the study results can be used for the titanium-steel connection type, bolt type selection and optimization and can provide a useful reference.

     

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