无网格法在金属塑性成形中的研究与应用进展

介绍了无网格方法的基本原理;论述了无网格法在金属塑性成形领域里国内外的研究与应用现状;总结了相关关键处理技术,包括权函数的选取、本质边界的施加、离散积分方案、动态接触边界的自动处理以及金属塑性力学摩擦模型的选取等;最后对无网格法在金属塑性成形领域未来的研究方向进行了展望,并指出无网格法在金属塑性成形领域将有着更为广阔的发展与应用前景。

Advancesin the study and applcation of meshless methods in metal forming

Meshless methods are a new type of numerical analysis method developed recently, Different from FEM, only nodal data are needed during the construction of field functions in meshless methods, thus getting rid of meshing and eliminating mesh distortion unavoidable in FEM, Based on their merits, meshless methods can handle metal forming processes very effectively especially large plastic deformations. After introducing the basic principles of meshless methods, this paper summarizes the advances in the study and application of meshless methods in metal forming both home and abroad. The key techniques involved are discussed, including selection of weight function, imposition of essential boundary conditions, techniques of discretization and integration, meshless contact searching algorithms and selection of frictional models in metal forming. For wider engineering application of meshless methods in metal forming, some future research areas are pointed out, i.e. coupling of meshless methods and FEM, die shape design optimization using meshless methods, prediction of cracks and defects during metal forming processes and application of meshless methods for solving 3D plastic forming problems.