Adaptive Mesh Of Two-dimensional Cutting Simulation Based On ABAQUS

Adaptive mesh refinement is one of the most efficient and reliable way of finite element mesh generation. Because of the importance in improving the efficiency and accuracy of numerical simulation, adaptive mesh refinement plays an important role in the field of science and engineering. With the model becoming more and more complex, most finite element models contain some area with severe physical changes, such as large deformation, the stress concentration, contact discontinuity and the slip surface area. In the process of adaptive mesh refinement, finite element mesh is constantly adjusted in the iterative process, so as to make the density distribution reasonable. The mesh is automatically refined in the area of larger numerical solution changes. The mesh size is bigger in the area of smaller numerical solution changes. As a result, the calculation is more accurate but the occupancy of resources is seldom.The problem of mesh distortion and long operation time always exist in cutting simulation. This article improves adaptive mesh refinement based on ABAQUS, so as to achieve the purpose of improving operation efficiency and operation precision. The main contents are as follows:(1) In this dissertation, the generation of finite element mesh and adaptive mesh generation are analyzed, including structured/unstructured grid and four adaptive schemes: h method, p method, r method, h-p method. Arbitrary Lagrangian-Eulerian(ALE) and Adaptive Remeshing are provided in ABAQUS to apply adaptive mesh refinement. However, both of them significantly increase the amount of calculation and can not solve the problem of mesh distortion completely.(2) Based on adaptive mesh refinement theory, three typical mesh refinement schemes are analyzed. The advantages and disadvantages of three kinds of schemes and the scope of application are analyzed in detail. At the same time, automatic refinement is implemented through Python script writing(3) Three kinds of methods for determining finite element refined are proposed: Geometric envelope method, Physical screening method and Mixing method. On this basis, moving load and tensile testing simulation are used to validate these methods, superiority in reducing mesh quantity and improving operation efficiency.(4) At the end of the dissertation, adaptive mesh refinement is applied to metal cutting simulation, and computing precision and computing efficiency are confirmed to be improved.