外文翻译---冲压工艺中几何及内圆角对模具应力产生的影响.docx

附录A 外文文献Effects of geometry and fillet radius on die stresses in stamping processesAbstract: This paper describes the use of the finite element method to analyze the failure of dies in stamping processes. For the die analyzed in the present problem, the cracks at different locations can be attributed to a couple of mechanisms. One of them is due to large principal stresses and the other one is due to large shear stresses. A three-dimensional model is used to simulate these problems first. The model is thensimplified to an axisymmetric problem for analyzing the effects of geometry and fillet radius on die stresses. 2000 Elsevier Science S.A. All rights reserved.Keywords: Stamping; Metal forming; Finite element method; Die failure1. IntroductionIn metal forming processes, die failure analysis is one of the most important problems. Before the beginning of this decade, most research focused on the development of the- oretical and numerical methods. Upper bound techniques [1,2], contact-impact procedures [3] and the finite element method (FEM) [4,5] are the main techniques for analyzing stamping problems. With the development of computer technology, the FEM becomes the dominant technique [6-12].Altan and co-workers [13,14] discussed the causes of failure in forging tooling and presented a fatigue analysis concept that can be applied during process and tool design to analyze the stresses in tools. In these two papers, they used the punching load as the boundary force to analyze the stress states that exist in the inserts during the forming process and determined the causes of the failures. Based on these concepts, they also gave some suggestions to improve die design.In this paper, linear stress analysis of a three-dimensional (3D) die model is presented. The stress patterns are then analyzed to explain the causes of the crack initiation. Some suggestions about optimization of the die to reduce the stress concentration are presented. In order to optimize the design of the