Application of Finite Element Method to Analysis of Ductile Fracture Criteria for Punched Cutting Surfaces

作者：Tanaka Toru^*; Hagihara Seiya; Tadano Yuichi; Inada Takuma; Mori Takanobu; Fuchiwaki Kenji

来源：Materials Transactions, 2013, 54(9): 1697-1702.

DOI：10.2320/matertrans.P-M2013811

• shearing
• finite element method
• punching
• fine blanking
• ductile fracture criterion
• clearance

Many types of punching processes are utilized in the production of automobile parts and other components. In normal punching with a punch and a die, a sheared surface and a fractured one are usually formed on the cut surface. Here, to produce highly accurate parts, it is important to estimate the ratio of the sheared surface to the cut surface and to economically produce smooth cut surfaces, optimal tools and punching conditions must be selected within the limits of cost constraints. The finite element method (FEM) has been applied to the analysis of the ratio of the sheared surface to the fractured surface on the cut surfaces. For this, the ductile fracture criteria for the fracture initiation of the cut surface have been proposed by several researchers. It is difficult to determine the fracture criteria on the cut surface by tensile tests or bending tests because the punching process consists of many complicated steps. In this study, we apply the FEM to four punching arrangements to evaluate the ductile fracture criteria proposed by Oyane and by Cockcroft and Latham. We find that the morphology of the cut surface is affected by clearance between the punch and the die, by blank holding conditions and by ductile fracture criteria.

• 出版日期2013