Effect of Void Shape and Its Growth on Forming Limits for Anisotropic Sheets Containing Non-Spherical Voids
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概要
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Most failures of ductile materials in metal forming processes occurred due to material damage evolution- void nucleation, growth and coalescence of neighboring voids. Recently, Gologanu-Leblond-Devaux (J. Mech. Phys. Solids, Vol.41 (1993), pp. 1723-1754) extended the classical Gurson model (ASME J. Engng. Mater. Technology, Vol.99 (1997), pp.2-15) to a ductile material containing an oblate ellipsoidal cavity. And, they proposed a new approximate yield function incorporating the initial void shape effects, which is significant especially at low stress triaxiality. In the present work, the Gologanu-Leblond-Devaux's yield function for anisotropic sheet materials containing axisymmetric prolate ellipsoidal cavities is adopted in evaluating analytically forming limits of sheet metals under biaxial stretching by Marciniak and Kuczynski (M-K) model. The effect of a void shape and growth on the forming limits of sheet metals under biaxial tensile loading is introduced and examined within the framework of the M-K model, along with the effect of including a first-order strain gradient term in the flow stress. To confirm the validity of the proposed model, the predicted FLDs were compared with experimental results for steel sheets. The predicted forming limits for the voided sheets were found to agree well with the experimental data.
- 一般社団法人日本機械学会の論文
- 2004-07-15
著者
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Son Hyun-sung
Department Of Mechanical Engineering Kyungpook National University
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Kim Young-suk
Department Of Mechanical Engineering Kyungpook National University
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HWANG Sang-Moo
Department of Mechanical Engineering, Pohang University of Science & Technology
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Hwang Sang-moo
Department Of Mechanical Engineering Pohang University Of Science & Technology
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Hwang Sang-moo
Department Of Mechanical Engineering Pohang University Of Science And Technology
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NA Kyoung-Hoan
Korea Institute of Industrial Technology
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Kim Young-suk
Department Of Food Science And Technology Ewha Womans University
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Kim Young-suk
Department Of Food Science And Technology Ewha Woman's University
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