Rezoning Method In Nonlinear Simulation Of Plate Under Moving Load

There are line heating, welding, local roll forming and other processing methods of plate in ship building. Compared to the plate dimensions, the region under steady moving linear load in the processing methods is narrow with highly nonlinear characteristics. How to coordinate the relationship between the process parameters and the response is one of the main contents in the process. Since the linear load moves on the plate, the characteristics of local nonlinear response keep changing continuously, bringing complicated calculation. Because the mesh for the global region under linear load should be fine, conventional numerical methods result in low efficiency. If considering other region away from the loading area in the processing remains weak nonlinear or elastic, the mesh for the region under current loads can be fine, while the mesh for other region away from the loads can be relatively coarser in the numerical simulation, which the fine mesh following with the moving loads, i.e. the rezoning numerical method which can save much computational time. In this paper, the impact of the fine mesh size and the rezoning frequency on numerical computation and the relationship with numerical accuracy and computational efficiency were researched by this method.The numerical computation examples of line heating process, local roll forming process, heating and roll integration forming process were carried out, resulting the impact of the fine mesh size and the rezoning frequency on the computational efficiency and numerical accuracy in the rezoning numerical method. And the efficient numerical computation means of plate under moving linear loads with local nonlinear response verify the effectiveness of the method.