Abstract
Crack propagation in ductile steel was investigated using impact-loaded three-point bending (3PB) specimens. Results from experiments and numerical simulations were compared. The specimens were 320 × 75 mm by 10 mm thick. A new 3PB specimen design with reduced width at the ends was developed to avoid the influence of uncertain boundary conditions at the impact heads. One static and two dynamic tests with impact velocities of 30.2 and 45.2 m/s were performed. High-speed photography was used to obtain crack growth and crack tip opening displacement data. Moiré interference patterns were used to directly measure the relative rotation of the two specimen halves. Shear lip fracture surfaces were obtained for all three loading conditions. The experiments indicated no, or only a slight, loading rate influence on the crack propagation.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Kao, H. R., “The dynamic behavior of the middle or side impact loaded 3-point bend specimen,” Lund Institute of Technology, Technical Report LUTFD2 TFHF-3034, pp. 1–18, 1990.
Van Elst, H. G., “Assessment of dynamic fracture propagation resistance at instrumented high velocity gasgun impact tests on SENB-Specimens,” ICF, Vol. 6, No. 5, pp. 3089–3097, 1984.
Chae, J. S., Park, T. W. and Kim, J., “Dynamic Analysis of A Flexible Multibody System,” Int. J. Precision Engineering and Manufacturing, Vol. 6, No. 4, pp. 21–25, 2005.
Son, I. S., Cho, J. R. and Yoon, H. I., “Effects of a Moving Mass on the Dynamic Behavior of Cantilever Beams with Double Cracks,” Int. J. Precision Engineering and Manufacturing, Vol. 9, No. 3, pp. 33–39, 2008.
Nakamura, T., Shih, C. F. and Freund, L. B., “Analysis of a dynamically loaded three point bend ductile fracture specimen,” Engineering Fracture Mechanics, Vol. 25, No. 3, pp. 323–339, 1986.
Bergmark, A. and Kao, H. R., “Dynamic crack initiation in 3PB ductile steel specimens,” Lund Institute of Technology, Technical Report LUTFD2 TFHF-3041, pp. 1–23, 1991.
Jang, I. S. and Chae, D. B., “The derivation of simplified vehicle body stiffness equation using collision analysis,” Trans. of KSAE, Vol. 8, No. 4, pp. 177–185, 2000.
Kanninen, M. F. and Popelar, C. H., “Advanced Fracture Mechanics,” Oxford Engineering Science Series 15, 1985.
Zhang, J. F., Wang, B. and Dong, S., “Analysis of Factors Impacting Atmospheric Pressure Plasma Polishing,” Int. J. Precision Engineering and Manufacturing, Vol. 9, No. 2, pp. 39–43, 2008.
Huang, C., Zhu, H., Lu, X., Li, Q. and Che, C., “Transition Mechanism from Brittle Fracture to Ductile Shear when Machining Brittle Materials with an Abrasive Waterjet,” Int. J. Precision Engineering and Manufacturing, Vol. 9, No. 2, pp. 11–17, 2008.
Knott, J. F., “Fundamentals of Fracture Mechanics,” Butterworth, 1973.
Aref, H., “Academic Press — Vol. 41,” Advances in Applied Mechanics, 2006.
Malvern, L. E., “The propagation of longitudinal waves of plastic deformation in a bar of material exhibiting a strain-rate effect,” J. Appl. Mech., Vol. 18, pp. 203–208, 1951.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Cho, JU., Cho, CD. & Han, MS. Study of dynamic crack propagation in 3PB steel specimens loaded by impact. Int. J. Precis. Eng. Manuf. 10, 67–72 (2009). https://doi.org/10.1007/s12541-009-0029-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12541-009-0029-9