基于有限元和响应面近似的卡箍连接处最大弯曲应力估算

The maximum bending stress calculation of hoop connection based on finite element and RSM

在水下航行器壳体连接设计中,卡箍连接设计在实际工程中得到了广泛应用。水下航行器入水过程及其复杂,目前研究对卡箍连接处的力学分析还不够充分。先对水下航行器入水瞬间,卡箍连接处进行力学分析,然后使用有限元和响应面近似法对受力分析加以验证,最后对某型水下航行器卡箍连接处最大弯曲应力进行函数拟合。最后对通过拟合的某型水下航行器入水过程中卡箍连接处最大弯曲应力函数关系式计算得到的数值和有限元分析得到的数值进行比较,分析可知两组数据相对误差不大于5%,在工程计算许用的范围内。采用有限元和响应面近似方法来拟合水下航行器入水时卡箍连接处最大弯曲应力的函数关系式是可行的,该方法拟合的函数关系式可以很方便地在卡箍连接设计中使用。

The basic function of hoop connection is to connect two parts of unmanned undersea vehicle（UUV） shell,but hoop connection mechanical analysis isn＇t enough.In this paper,Finite Element Method（FEM） and Response Surface Methodology（RSM） is used to analyze strength of hoop connection and the limit state function related to the maximal bending stress of hoop connection is developed.Finally,though comparing the data from FEM and the value computed by user formula,the error is less than 5% and the error is allowable in engineering design.In a word,using finite element method and response surface methodology to develop the function related to the maximal bending stress of hoop connection is feasible,and the propose method in this paper can be used in hoop connection design.