Springback prediction in sheet metal forming of high strength steels |
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| Affiliation: | 1. Department of Tool and Materials Engineering, King Mongkut’s University of Technology Thonburi, 126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok 10140, Thailand;2. Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, 126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok 10140, Thailand;3. National Metal and Materials Technology Center, 114 Paholyotin Rd., Klong 1, Klong Luang, Pathumtani 12120, Thailand;1. Impact and Crashworthiness Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge MA, USA;2. Solid Mechanics Laboratory (CNRS-UMR 7649), Department of Mechanics, École Polytechnique, Palaiseau, France;1. School of Mechanical Engineering, Xi’an Jiaotong University, No. 28, Xianning Road, Xi’an, Shaanxi, China;2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Geongbuk 790-784, Republic of Korea;3. Manufacturing Process Research, General Motors China Science Lab, GM (China) Investment Co., Ltd., No. 56, Jinwan Road, Shanghai, China;4. School of Mechanical Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 609-735, Republic of Korea;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China;2. State Key Laboratory of Development and Application Technology of Automotive Steels (Baostell Group), Shanghai Baoshan, 201900, China;3. Key Laboratory of Advanced Design and Simulation Technology for Special Equipments Ministry of Education, Hunan University, Changsha, 410082, China;1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350116, Fujian, China;2. Department of Mechanical Engineering, University of Aveiro, Aveiro, 3810-193, Portugal |
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| Abstract: | Both increased weight reduction and improved passive safety have been simultaneously required for components of new vehicle generation. Thus, advanced high strength Dual Phase (DP) steels have been progressively used when making automotive parts. During each sheet metal forming process the high strength steels exhibit distinct springback effect, which is governed by strain recovery of material after load removal. The springback is variably sensitive to materials and process parameters. Considering springback occurred in a formed part is significant for designing tools and dies. In this work, both experiments and Finite Element Analyses (FEA) of a U-shape forming test were performed and compared for investigating the springback effect. Two DP steels (JSC590R and JSC780Y) with different strengths and a mild steel (JSC270C) were taken into account. The planar anisotropic material model according to Hill’s 1948, Barlat’s yield 2000, and Yoshida–Uemori kinematic hardening model were applied in the simulations. Various mechanical testing as hydraulic bulge test, disk compression test, and in particular cyclic test under tension and compression load were carried out in order to determine required materials parameters of the models. Obviously, steel with higher yield and tensile strength definitely showed an increasing in magnitude of both springback and curling. All presented material models restricted ability to predict springback effect of the examined steels, although the Yoshida–Uemori criterion provided more accurate results than other ones. The model is therefore preferred for describing the strain recovery mechanism of high strength steels, while parameter determination plays a decisive role. The cyclic test was verified to successfully describe the kinematic behaviour of material. |
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