DOI QR코드

DOI QR Code

3차원 파단 변형률 평면을 이용한 비보강 원판의 펀칭 파단 시뮬레이션

Punching Fracture Simulations of Circular Unstiffened Steel Plates using Three-dimensional Fracture Surface

  • 박성주 (인하대학교 조선해양공학과) ;
  • 이강수 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Park, Sung-Ju (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Kangsu (Korea Research Institute of Ships and Ocean Engineering) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 투고 : 2016.10.21
  • 심사 : 2016.12.07
  • 발행 : 2016.12.31

초록

Accidental events such as collisions, groundings, and hydrocarbon explosions in marine structures can cause catastrophic damage. Thus, it is extremely important to predict the extent of such damage, which determines the total amount of oil spills and the residual hull girder strength. Punching fracture tests were conducted by Choung (2009b), where various sizes of indenters and circular unstiffened steel plates with different thicknesses were used to quasi-statically realize damage extents. A three-dimensional fracture strain surface was developed based on a reference (Choung et al., 2015b), where the average stress triaxiality and average normalized Lode angle were used as the parameters governing the fracture of ductile steels. In this study, new numerical analyses were performed using very fine axisymmetric elements in combination with an Abaqus user-subroutine to implement the three-dimensional fracture strain surface. Conventional numerical analyses were also conducted for the tests to identify the best fit fracture strain values by changing the fracture strains. Based on the phenomenon of the average normalized Lode angle starting out positive and then becoming slightly negative, it was inferred that the shear stress primarily dominates in determining the fractures locations, with a partial contribution from the compressive stress. It should be stated that the three-dimensional fracture surface effectively predicted at least the shear stress-dominant fracture behavior of a mild steel.

키워드

참고문헌

  1. Altair, 2013. HyperWorks 12.0 User Manual. Altair.
  2. ASTM E8, 2004. Standard Test Methods of Tension Testing of Metallic Materials. American Society for Testing and Materials.
  3. Bao, Y., Wierzbicki, T., 2004. On Fracture Locus in the Equivalent Strain and Stress Triaxiality Space. International Journal of Mechanical Sciences, 46(1), 81-98. https://doi.org/10.1016/j.ijmecsci.2004.02.006
  4. Bao, Y., 2005. Dependence of Ductile Crack Formation in Tensile Tests on Stress Triaxiality, Stress and Strain Ratios. Engineering Fracture Mechanics, 72(4), 505-522. https://doi.org/10.1016/j.engfracmech.2004.04.012
  5. Bai, Y., Wierzbicki, T., 2008. A New Model of Metal Plasticity and Fracture with Pressure and Lode Dependence. International Journal of Plasticity, 24(6), 1071-1096. https://doi.org/10.1016/j.ijplas.2007.09.004
  6. Basu, S., Benzerga, A.A., 2015. On the path-dependence of the fracture locus in ductile materials: Experiments. International Journal of Solids and Structures, 71, 79-90. https://doi.org/10.1016/j.ijsolstr.2015.06.003
  7. Benzerga, A.A., Surovik, D., Keralavarma, S.M., 2012. On the Path-dependence of the Fracture Locus in Ductile Materials-analysis. International Journal of Plasticity, 37, 157-170. https://doi.org/10.1016/j.ijplas.2012.05.003
  8. Choung, J., Cho, S.R., 2008a. Experimental and Theoretical Investigations on the Fracture Criteria for Structural Steels. Journal of the Society of Naval Architects of Korea, 45(2), 157-167. https://doi.org/10.3744/SNAK.2008.45.2.157
  9. Choung, J., Cho, S.R., 2008b. Study on true stress correction from tensile tests. Journal of Mechanical Science and Technology, 22, 1039-1051. https://doi.org/10.1007/s12206-008-0302-3
  10. Choung, J., 2009a. Comparative Studies of Fracture Models for Marine Structural Steels. Ocean Engineering, 36(15), 1164-1174. https://doi.org/10.1016/j.oceaneng.2009.08.003
  11. Choung, J., 2009b. Micromechanical Damage Modeling and Simulation of Punch Test. Ocean Engineering, 36(15), 1158-1163. https://doi.org/10.1016/j.oceaneng.2009.08.004
  12. Choung, J., Shim, C.S., Kim, K.S., 2011. Plasticity and Fracture Behaviors of Marine Structural Steel, part III: Experimental Study on Failure Strain. Journal of Ocean Engineering and Technology, 25(3), 53-66. https://doi.org/10.5574/KSOE.2011.25.3.053
  13. Choung, J., Shim C.S., Song H.C., 2012. Estimation of Failure Strain of EH36 High Strength Marine Structural Steel using Average Stress Triaxiality. Marine Structures, 29(1), 1-21. https://doi.org/10.1016/j.marstruc.2012.08.001
  14. Choung, J., Nam, W., 2013. Formulation of Failure Strain According to Average Stress Triaxiality of Low Temperature High Strength Steel (EH36). Journal of Ocean Engineering and Technology, 27(2), 19-26. https://doi.org/10.5574/KSOE.2013.27.2.019
  15. Choung, J., Nam, W., Kim, Y., 2014a. Fracture Simulation of Low-temperature High-strength Steel (EH36) using User-subroutine of Commercial Finite Element Code. Journal of Ocean Engineering and Technology, 28(1), 34-46. https://doi.org/10.5574/KSOE.2014.28.1.034
  16. Choung, J., Nam, W., Lee, D., Song, S.Y., 2014b. Failure Strain Formulation Via Average Stress Triaxiality of an High Strength Steel for Arctic Structures. Ocean Engineering, 91, 218-226. https://doi.org/10.1016/j.oceaneng.2014.09.019
  17. Choung, J., Park, S.J., Kim, Y., 2015a. Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part I Theoretical Background and Experimental Studies. Journal of Ocean Engineering and Technology. 29(6), 445-453. https://doi.org/10.5574/KSOE.2015.29.6.445
  18. Choung, J., Park, S.J., Kim, Y., 2015b. Development of Three-Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part II Formulation of Fracture Strain Surface. Journal of Ocean Engineering and Technology. 29(6), 454-462. https://doi.org/10.5574/KSOE.2015.29.6.454
  19. HSE, 2003. Research report 071: Friction in temporary works. Health and Safety Executive. United Kingdom.
  20. Lehmann, E., Yu, X., 1998. On ductile rupture criteria for structural tear in the case of ship collision and grounding. Proceedings of the Seventh International Symposium on Practical Design of Ships and Mobile Units, 141-147.
  21. Narr, H., Kujala, P., Simonsen, B.C., Ludolphy, H., 2002. Comparison of the crashworthiness of various bottom and side structures. Marine Sturctures, 15, 443-460. https://doi.org/10.1016/S0951-8339(02)00012-6
  22. Norsok Standard N-004, 2004. Design of Steel Standards. Standards Norway.
  23. Paik, J.K., Chung, J.Y., Choe, I.H., Thayamballi, A.K., Pedersen, P.T., Wang, G., 1999. On rational design of double Hull Tanker structures against collision. Annual Meeting of SNAME, 323-363.
  24. Simulia, 2008. Abaqus User Manual. Silumia.
  25. Thomas, N., Basu, S., Benzerga, A.A., 2016. On fracture loci of ductile materials under non-proportional loading. International Journal of Mechanical sciences, 117, 135-151. https://doi.org/10.1016/j.ijmecsci.2016.08.007
  26. Yu, H., Olsen, J.S., He, J., Zhang, Z., 2016. Effects of loading path on the fracture loci in a 3D space. Engineering Fracture Mechanics, 151, 22-36. https://doi.org/10.1016/j.engfracmech.2015.11.005

피인용 문헌

  1. Ductile Fracture Predictions of High Strength Steel (EH36) using Linear and Non-Linear Damage Evolution Models vol.31, pp.4, 2017, https://doi.org/10.26748/KSOE.2017.08.31.4.288