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Advances in FE explicit formulation for simulation of metalforming processes

机译：有限元显式配方在金属成型过程仿真中的进展

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This paper presents some advances of finite element explicit formulation for simulation of metal forming processes. Because of their computational efficiency, finite element programs based on the explicit dynamic formulation proved to be a very attractive tool for the simulation of metal forming processes. The use of explicit programs in the sheet forming simulation is quite common, the possibilities of these codes in bulk forming simulation in our opinion are still not exploited sufficiently. In our paper, we will consider aspects of bulk forming simulation.We will present new formulations and algorithms developed for bulk metal forming within the explicit formulation. An extension of a finite element code for the thermomechanical coupled analysis is discussed. A new thermomechanical constitutive model developed by the authors and implemented in the program is presented.A new formulation based on the so-called split algorithm allows us to use linear triangular and tetrahedral elements in the analysis of large plastic deformations characteristic to forming processes. Linear triangles and tetrahedra have many advantages over quadrilateral and hexahedral elements. Linear triangles and tetrahedra based on the standard formulations exhibit volumetric locking and are not suitable for large plastic strain simulation. The new formulation allows to overcome this difficulty.New formulations and algorithms have been implemented in the finite element code Stampack developed at the International Centre for Numerical Methods in Engineering in Barcelona. Numerical examples illustrate some of the possibilities of the finite element code developed and validate new algorithms.
机译：本文介绍了有限元显式公式化在模拟金属成形过程中的一些进展。由于它们的计算效率，基于显式动态公式的有限元程序被证明是用于模拟金属成型过程的非常有吸引力的工具。在板料成形仿真中使用显式程序非常普遍，我们认为，这些代码在整体成形仿真中的可能性仍然没有得到充分利用。在本文中，我们将考虑整体成型模拟的各个方面。我们将在显式配方中介绍针对整体金属成型开发的新配方和算法。讨论了热机械耦合分析的有限元代码的扩展。提出了由作者开发并在程序中实现的新的热力学本构模型。基于所谓的拆分算法的新公式使我们能够使用线性三角形和四面体元素来分析成型过程的大塑性变形特征。与四边形和六面体元素相比，线性三角形和四面体具有许多优势。基于标准配方的线性三角形和四面体显示出体积锁定，不适合用于大塑性应变模拟。新的公式可以克服这一难题。巴塞罗那国际工程数值方法中心开发的有限元代码Stampack已实现了新的公式和算法。数值示例说明了开发有限元代码并验证新算法的一些可能性。

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