미시역학 소성모델을 이용한 충격하중을 받는 보강판의 파단 예측
Fracture Estimation of Stiffened Plates under Impact Loading using Micromechanics Plasticity Model
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초록
This paper first reviews the physical meanings and the expressions of two representative strain rate models: CSM (Cowper-Symonds Model) and JCM (Johnson-Cook Model). Since it is known that the CSM and the JCM are suitable for low-intermediate and intermediate-high rate ranges, many studies regarding marine accidents such as ship collision/grounding and explosion in FPSO have employed the CSM. A formula to predict the material constant of the CSM is introduced from literature survey. Numerical simulations with two different material constitutive equations, classical metal plasticity model based on von Mises yield function and micromechanical porous plasticity model based on Gurson yield function, have been carried out for the stiffened plates under impact loading. Simulation results coincide with experimental results better when using the porous plasticity model.
Abstract
This paper first reviews the physical meanings and the expressions of two representative strain rate models: CSM (Cowper-Symonds Model) and JCM (Johnson-Cook Model). Since it is known that the CSM and the JCM are suitable for low-intermediate and intermediate-high rate ranges, many studies regarding marine accidents such as ship collision/grounding and explosion in FPSO have employed the CSM. A formula to predict the material constant of the CSM is introduced from literature survey. Numerical simulations with two different material constitutive equations, classical metal plasticity model based on von Mises yield function and micromechanical porous plasticity model based on Gurson yield function, have been carried out for the stiffened plates under impact loading. Simulation results coincide with experimental results better when using the porous plasticity model.
참고문헌 (19)
- Cho S.R., "Experimental and Analytical Investigations on the Response of Stiffened Plates Subjected to Lateral Collisions", Marine Structures, 22, pp.84~95 (2009)
- Choung J.M., "On the Fracture Criteria of Steels for Marine Structures Subjected to Impact Loadings", 박사, pp.2008
- Choung J.M., "Comparative Studies of Fracture Models for Marine Structural Steels", Ocean Engineering, 36, pp.1164~1174 (2009)
- Choung J.M., "Micromechanical Damage Modeling and Simulation of Punch Test", Ocean Engineering, 36, pp.1158~1163 (2009)
- 정준모, "구조물용 강재의 파단기준에 대한 실험 및 이론 연구", 대한조선학회 논문집, 45(2), pp.157~167 (2008), 대한조선학회
- Choung J.M., "On Comparative Studies of Fracture Models for Shipbuilding and Offshore Structural Steels", Proceedings of Fourth International Conference on Collision and Grounding of Ships(ICCGS 2007), pp.117~185 (2007)
- Chu C., "Void Nucleation Effects in Biaxially Stretched Sheets", J. Eng. Matl. Tech., 102, pp.249~256 (1980)
- Strain Hardening and Strain Rate Effects in the Loading of Cantilever Beams, "Cowper G.", Brown Univ, ~, pp.Report No. 28. (1957)
- Gurson A., "Continuum Theory of Ductile Rupture by Void Nucleation and Growth:Part 1 -Yield Criteria and Flow Rules for Porous Ductile Media", ASME J. Eng. Mat. and Tech., 99, pp.2~15 (1977)
- Johnson G.R., "Fracture Characteristics of Three Metals Subjected to Various Strain, Strain Rates Temperatures and Pressures", Engineering Fracture Mechanics, 21(1), pp.31~48 (1985)
- Lee H.J., "A Study on the Application of Material Properties in Ship Collision Analysis", Proceedings of the Annual Autumn Meeting SNAK, pp.1050~1057
- Lehmann E., "On Ductile Rupture Criteria for Structural Tear in the Case of Ship Collision and Grounding", Seventh International Symposium on Practical Design of Ships and Mobile Units, pp.149~156 (1998)
- Needleman A., "An Analysis of Ductile Rupture in Notched Bars", Journal of the Mechanics and Physics of Solids, 32, pp.461~490 (1984)
- Nemat-Nasser S., "Thermomechanical Response of DH-36 Structural Steel over a Wide Range of Strain Rates and Temperature", Mech. Mat., 35, pp.1023~1047 (2003)
- Norwegian Technology Standard Institution (NTSI), "NORSOK Standard N-004 Design of Steel Structures", ~ (2004)
- Tvergaard V., "Influence of Voids on Shear Band Instabilities under Plane Strain Condition", Int. J. Fract. Mech., 17, pp.389~407 (1981)
- Tvergaard V., "Analysis of the Cup-Cone Fracture in a Round Tensile Bar", Acta Metallurgica, 32, pp.157~169 (1984)
- Törnqvist R., "Design of Crashworthy Ship Structures", 박사, pp.2003
- Urban J., "Crushing and Fracture of Lightweight Structures", 박사, pp.2003