Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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On the Derivation of Material Constants Associated with Dynamic Behavior of Heat Formed Plates

열성형 판 부재의 동적거동에 관련된 재료상수 산출에 관한 연구

  • Lee, Joo-Sung (School of Naval Architecture and Ocean Engineering, University of Ulsan) ;
  • Lim, Hyung-Kyun (Division of Ship Production Design, Hyundai Mipo Dockyard Co. Ltd.)
  • 이주성 (울산대학교 조선해양공학부) ;
  • 임형균 (현대미포조선(주) 선체생산설계부)
  • Received : 2015.09.14
  • Accepted : 2016.03.21
  • Published : 2016.04.29
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Abstract

When impact load is applied to a plate structure, a common phenomenon that occurs in structures is plastic deformation accompanied by a large strain and eventually it will experience a fracture accordingly. In this study, for the rational design against accidental limit state, the plastic material constants of steel plate which is formed by line heating and by cold bending procedure have been defined through the numerical simulation for the high speed tension test. The usefulness of the material constants included in Cowper-Symonds model and Johnson-Cook model with the assumption that strain rate can be neglected when strain rate is less than the intermediate speed is verified through comparing the present numerical results with those in references. This paper ends with describing the future study.

구조물에 충격하중이 작용하면, 그 구조물은 통상적으로 대변형을 동반하는 소성변형과 최종적으로 그에 따른 파단을 경험하게 된다. 본 연구에서는 사고적 극한 상태에 대한 합리적인 설계를 위해 열성형된 판과 냉간성형된 판의 재료상수를 고속인장시험에 대한 수치시현을 통해 정의하였다. 변형율이 중간 속도 이하인 경우에는 변형율 속도의 영향을 무시할 수 있다는 가정과 함께 Cower-Symond 모델과 John-Cook 모델에 포함되는 재료상수들의 유용성을 참고문헌들의 결과와 비교하여 입증하였다. 본 논문은 향후 연구 내용에 대한 언급을 포함하면서 마무리하였다.

Keywords

References

  1. Choung, J.M. (2007) On the Fracture Criteria of Steels for Marine Structures Subjected to Impact Loadings, Ph.D. Thesis, University of Ulsan.
  2. Choung, J.M., Shin, C.S., Kim, K.S. (2011) Plasticity and Fracture Behaviors of a Marine Structural Steel, Part II: Technical Backgrounds of Fracture, J. Ocean Eng. & Tech., 25, pp.92-100. https://doi.org/10.5574/KSOE.2011.25.2.092
  3. Jang, C.D., Ko, D.E., Kim, B.I,. Park, J.U. (2001) An Experimental Study of Characteristics of Plate Deformation by Heating Process, J. Soc. Nav. Arch. Korea, 38, pp.62-70.
  4. Jones, N. (1989) Structural Impact, Cambridge University Press, Cambridge.
  5. Lee, J.W. (1983) On the Optimization Design of Soft Bow Structure, Proc. of the 2nd Internal, Symposium on Practical Design of Ships and Mobile Units, pp.429-435.
  6. Lee, J.S. (1997) Plate Forming Automation System of Steel Plates by Line Heating Method (III), J. Soc. Nav. Arch. Korea, 34, pp.85-89.
  7. Lim, H.K. (2012) On the Behavior Characteristics by Impact Loadings of Steels for Ship Shell Structures with Line Heating, Ph.D. Thesis, University of Ulsan.
  8. Meyers, M.A. (1994) Dynamic Behavior of Materials, John Wiley & Sons, New York.
  9. Min, D.K., Shim, C.S., Shin, D.W., Cho, S.R. (2011) On the Mechanical Properties at Low Temperatures for Steels of Ice-Class Vessel, J. Soc. Nav. Arch. Korea, 48, pp.171-177. https://doi.org/10.3744/SNAK.2011.48.2.171
  10. Min, D.K., Cho, S.R. (2012) On the Fracture of Polar Class Vessel Structures Subjected to Lateral Impact Loads, J. Soc. Nav. Arch. Korea, 49, pp.171-177.
  11. Paik, J.K., Pedersen, P.T. (1995) Collision Strength Analysis of Double Hull Tanker, J. Soc. Nav. Arch., 32, pp.102-117.
  12. ABAQUS (2012) Abaqus V.6.12 Analysis User Manual, Simulia.
  13. Tsuji, I., Okumura, Y. (1988) A Study on Line Heating Process for Plate Bending of Ship Steel, J. West. Soc. Nav. Arch., 76, pp.149-160.
  14. Cowper, G., Symonds, P. (1957) Strain Hardening and Strain Rate Effects in the Loading of Cantilever Beams, Technical Report, Brown University, Division of Applied Mathematics, Report No.28.
  15. Johnson, G.R., Cook, W.H. (1985) Fracture Characteristics of Three Metals Subjected to Various Strain, Strain Rates Temperatures and Pressures, Eng. Fract. Mech., 21(1), pp.31-48. https://doi.org/10.1016/0013-7944(85)90052-9