Mesh shape optimization for sheet metal forming simulation

The mesh density distribution and element shape quality have a great impact on the accuracy of sheet metal forming simulation results. A modified quadrilateral mesh refining algorithm was presented, which could adjust the mesh density distribution conveniently, and the algorithm was extended to deal with both unstructured mesh and triangle-quadrilateral hybrid mesh. A mesh refining strategy was proposed which will help improve the refined mesh quality. Some topology cleanup procedures were presented for both structured mesh and unstructured mesh, which could effectively improve the shape quality of the mesh model.