High-Order Continuous Structure Finite Element-Free Eesh Coupling Method And ANSYS Secondary Development Calculation

The traditional finite element software does not simulate the function of high-order continuous structure.In this paper,the moving order least square method is used to approximate the high-order terms.Through the secondary development of ANSYS software,the stiffness matrix corresponding to the high-order terms is embedded into the ANSYS software to realize the high-order continuous structure.Numerical Simulation.Using the method of this paper,the numerical simulation of the plane thin plate and layered rock caverns considering the even stress is carried out.The main research work of this article is as follows:(1)Meshless method The node arrangement scheme for approximating higher-order terms adopts the same node arrangement scheme as in ANSYS modeling.The high-order item function is approximated by the moving least-squares method.The stiffness matrix integral corresponding to the high-order items uses the background network.Lattice integral,given the finite element-mesh-free coupled computational framework,using the secondary development of ANSYS software to embed the high-order matrix into the ANSYS software,and discussed the boundary conditions imposed by the coupling method.(2)Introduce the high-order term of scale factor in the calculation of the plane sheet,consider the uniform sheet as a high-order continuous structure,use the coupling method of this paper to carry out numerical simulation,verify the feasibility of this method,and analyze the influence factor of the scale on the displacement of the sheet.influences;(3)For the problem of bending effect in thin layers of layered rock masses,the bending characteristics can be more reflected when the coupled stress theory is used foranalysis.The bending curvature of the layered rock mass considering the couple stress is approximated by the nodal displacement.The numerical simulation of the layered rock cavern is carried out by using this method to verify the feasibility of the proposed method and the bending effect cloud map of the layered rock mass model is obtained.The effect of scale factors on the vertical displacement of layered rock caverns is analyzed.In this paper,the secondary development of ANSYS software is used to embed the high-order stiffness matrix into the ANSYS software and achieve the numerical simulation of the high-order continuous structure in ANSYS software.This research has theoretical reference value and practical guidance significance for the application of finite element meshless coupling algorithm to practical engineering problems.