Dynamic Finite Element Analysis For Reactor Box

For box-type reactor complex thin-walled shell structure, the finite element method is used to carry out its strength and displacement analysis. Based on the G. Kirchhoff assumption, this paper derived 24-node quadrilateral GQS24 element. The element is characterized by: GQS24 element is a plane with rotating degrees of freedom with four nodes of flat-panel element, each node has six degrees of freedom, and when they are derived based on the physical meaning of freedom will be divided into membrane element and bending element in two parts. When the structure of large deformation, which is to be considered non-linear geometry of the structure, the characteristics of this method is derived based on UL's element tangent stiffness matrix. Finally, for this is derived for the element, using the model representation of its accuracy verified, and non-linear geometry element carried out the same analogy to verify. To verify the results show that the type of element suitable for solve geometric of small deformation of shell-type problems.