International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

STUDY ON DYNAMIC BEHAVIOUR IN 3PB DUCTILE STEEL SPECIMEN APPLIED BY THE IMPACT LOAD

  • HAN M. S. (Faculty of Mechanical and Automotive Engineering, Keimyung University) ;
  • CHO J. U. (Faculty of Mechanical and Automotive Engineering, Kongju National University) ;
  • BERGMARK A. (Department of Solid Mechanics, Lund Institute of Technology)
  • Published : 2005.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

The dynamic crack growth in ductile steel is investigated by means of the impact loaded 3 point bending (3PB) specimens. Results from experiments and numerical simulations are compared to each other. A modified 3PB specimen designed with the reduced width at its ends has been developed in order to avoid the initial compressive loading of the crack tip and also to avoid the uncertain boundary conditions at the impact heads. Numerical simulations of the experiments are made by using a finite element method (FEM) code, ABAQUS. The high speed photography is used to obtain the crack growth and the data of the crack tip opening displacement (CTOD). The direct measurements of the relative rotations of two specimen halves are made by using the Moire interference pattern.

Keywords

References

  1. Bergmark, A. and Kao, H. R. (1991). Dynamic crack initiation in 3PB ductile steel specimens. Technical Report, LUTFD2 TFHF-3041, Lund Institute of Technology, Sweden, 1-23
  2. Brickstad, B. (1983). A viscoplastic analysis of rapid crack propagation experiments in steel. J Mech. Phys. Soilds 31, 4, 307-332 https://doi.org/10.1016/0022-5096(83)90002-9
  3. Cheon, S. S. and Meguid, S. A. (2004). Crush behavior of metallic foams for passenger car design. Int. J Automotive Technology 5, 1, 47-53
  4. Jang, I. S. and Chae, D. B. (2000). The derivation of simplified vehicle body stiffness equation using collision analysis. Trans. Korean Society Automotive Engineers 8, 4, 177-185
  5. Kanninen, M. F. etc. (1979). Dynamic crack propagation under impact loading. Nonlinear and Dynamic Fracture Mechanics, ASME AMD 35,185-200
  6. Hibbitt, Karlsson and Sorensen Inc. (1989). ABAQUS Manual. Version 4.8
  7. Malvern, L. E. (1951). The propagation of longitudinal waves of plastic deformation in a bar of material exhibiting a strain- rate effect. J Appl. Mech. 18, 203-208
  8. Nakamura, T., Shih, C. F. and Freund, L. B. (1986). Analysis of a dynamically loaded three- point-bend ductile fracture specimen. Eng. Frac. Mech. 25, 323-339 https://doi.org/10.1016/0013-7944(86)90129-3
  9. Song, J. H., Park, J. M., Chae, H. C., Kang, Y. H. and Yang, S. M. (2002). The estimation of dynamic strength characteristics of high tensile steel by dynamic lethargy coefficient. Trans. Korean Society Automotive Engineers 10, 2, 96-100
  10. Van Elst, H. G. (1984). Assessment of dynamic fracture propagation resistance at instrumented high velocity gasgun impact tests on SENB-Specimens. 6th International Conference on Fracture 5, 3089-3097
  11. Wihlborg, G. (1985). Design and application of a rig for high energy impact tests. IUTAM Symposium on MMMHVDF, 37-47