基于有限元的裙板锁螺纹联接数值模拟方法研究

RESEARCH ON NUMERICAL SIMULATION METHOD OF THREAD CONNECTION BASED ON FINITE ELEMENT METHOD

针对螺纹联接预紧力的设计方法及与加载扭矩的关系,提出了基于Abaqus软件的强制角位移载荷加载方法。为提高前处理效率,同时考虑螺纹连接处的结构特点,模型单元类型选择适用于接触分析的C3D8R和C3D10M;接触采用常规接触面定义方法,机械约束形式采用对称罚函数法处理;边界条件依据工程中预紧力的获取方式,在螺栓头部建立刚性单元,通过在刚性单元处施加强制角位移定义预紧力,此法较其他方法更简便且符合实际。最后通过采用该方法对裙板锁螺纹联接结构分析,得出预紧力和扭矩的关系,其结果与实验结果误差小于8%,位于理论计算范围内,证明了此方法的有效性。

A method of forced angular displacement loading based on ABAQUS software is proposed.In order to improve the efficiency of pretreatment,the type of model elements is selected as C3D8R and C3D10M suitable for contact analysis according to the structural characteristics of the threaded joints.In this method,the mechanical constraint is treated by balanced penalty function.The boundary conditions are established at the bolt head according to the way of obtaining the pretightening force in engineering.The pretightening force is defined by imposing a forced angular displacement on the rigid element.This method is simpler and more practical than other methods.Finally,the relationship between pretightening force and torsion is obtained by analyzing the thread connection structure of skirt plate lock with this method.The error between the results and the experimental results is within 8%,which is within the range of theoretical calculation.The validity of this method is proved.