Numerical simulation for deformation characteristics and fracture prediction of perforated sheet in incremental sheet pu
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ORIGINAL ARTICLE
Numerical simulation for deformation characteristics and fracture prediction of perforated sheet in incremental sheet punching Lihua Li 1 & Jin Wang 1 & Shuqin Zhang 1 Received: 8 April 2020 / Accepted: 9 August 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Based on the numerical simulation, the deformation characteristics of incremental sheet punching (ISP) of perforated sheet with circular holes was studied. Combined with the experimental results, the feasibility of using the normalized Cockroft-Latham ductile fracture criteria to predict fracture of perforated sheet during the ISP process was verified. On the basis of above, the influence of the geometric parameters of perforated sheet on the formability was studied. The main conclusions are the major strain is much greater than the minor strain at the interval of holes on the side wall of the perforated sheet; the thickness at the short-axis edge of the hole is smaller than that at the long-axis edge obviously; and the maximum value of major strain of perforated plate decreases with the increase of straight diameter center distance ratio. It is feasible to predict fracture of perforated sheet during the ISP process by numerical simulation with normalized Cockroft-Latham ductile fracture criteria. Keywords Incremental sheet punching . Perforated sheet . Numerical simulation . Fracture prediction . Formability
1 Introduction Incremental sheet forming (ISF) is a sheet metal forming technique in which the sheet metal is fixed on the bracket and the forming tool driven by a NC program presses into the sheet metal and moves along the specific path in one layer. After then, the tool descends to the next layer to continue forming until the sheet is formed into the desired shape. Compared with the traditional sheet metal forming, ISF does not need dies (single-point incremental sheet forming) or only a male die (two-point incremental sheet forming). According to the CAD model of products, sheet metal parts can be formed quickly. However, it takes a long time to form a single product by ISF process, so it is not suitable for mass production. The process of ISF is suitable for new product development and small batch production of sheet metal parts. In addition, it also has the advantages of low cost, small forming force, and good formability of sheet metal, while the geometric accuracy of the products needs to be improved. Nowadays, ISF * Jin Wang [email protected] 1
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266525, China
process has received wild attention in automobile, aerospace, and biomedical fields. It has good application prospects in manufacturing industries such as aerospace, domestic appliances, medical equipment, and automobiles [1–4]. In traditional incremental sheet forming, the tool and sheet always keep in contact. Incremental sheet punching (ISP) is developed on the basis of traditional incremental sheet forming. The difference is that the tool and the she
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