Experimental and numerical analysis of micromechanical damage in the punching process for High-Strength Low-Alloy steels |
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| Affiliation: | 1. LAMPA Laboratory (EA 1427), Arts et Métiers ParisTech, 2 Bd du Ronceray, 49000 Angers, France;2. DEVILLE ASC, ZI de Beauregard, 49150 Baugé, France;1. State Key Laboratory of Rolling and Automation, Northeastern University, P.O. Box. 105, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang 110819, China;2. Laboratory for Excellence in Advanced Steel Research, Innovation and Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, TX 79912, USA;1. Dalarna University, SE-781 70 Borlänge, Sweden;2. Luleå University of Technology, SE-971 87 Luleå, Sweden;3. SSAB EMEA AB, SE-781 84 Borlänge, Sweden;1. Dalarna University, SE-791 88 Falun, Sweden;2. Luleå University of Technology, SE-971 87 Luleå, Sweden;3. SSAB EMEA AB, SE-781 84 Borlänge, Sweden;1. Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan 430070, China;2. School of Material Science and Engineering, Wuhuan University of Technology, Wuhan 430070, China;1. School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;2. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Sequential sheet metal forming processes can result in the accumulation of work hardening and damage effects in the workpiece material. The mechanical strength of the final component depends on the “evolution” of these two characteristics in the different production steps. The punching process, which is usually in the beginning of the production chain, has an important impact on the stress, strain and damage states in the punched zones. It is essential that the influence of these mechanical fields be taken into account in the simulation of the forming sequence. In order to evaluate the evolution of each phenomenon, and in particular damage accumulation in the forming process, it is essential to characterize the punching process. The objective of this work is to understand and identify the physical damage mechanisms that occur during the punching operation and to establish relevant numerical models to predict the fracture location. The effect of the punch–die clearance on mechanical fields distribution is also discussed in this work. |
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| Keywords: | Punching Damage Fracture initiation Micro-voids Numerical simulation Stress state |
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