Abstract:
Aiming at the problem of stress and strain analysis of any given section or local part of the workpiece with an inner cavity structure, proposed is a method for directly generating quadrilateral mesh finite element model from industrial CT image. Firstly, the quadtree is used to generate the initial mesh from the industrial CT image, then the boundary mesh is generated, and finally, the mesh is optimized. In the process of generating the boundary mesh, a method is proposed to accurately locate the boundary points of the mesh by using the quadratic error function and the Bezier curve. Based on the quadtree neighborhood search algorithm, the boundary element connection templates are proposed. Optimization templates are proposed to improve the quality of the boundary mesh. The results of the mesh quality evaluation show that: the aspect ratio is less than 2 and the skewness is less than 0.6, which meet the actual engineering requirements. The quadrilateral mesh generated by CT images of an automobile hub and a valve body is analyzed for stress and strain. The numerical simulation results verify the correctness of the method proposed.