Ouk Sub Lee* and Jin Soo Park
The Journal of Mechanical Science and Technology, vol. 25, no. 9, pp.2211-2215, 2011

Abstract : This paper investigates the dynamic deformation behavior of bovine femur using a modified split Hopkinson pressure bar (SHPB) with a pulse shaper technique. The shape of the incident and reflected pulses modulated by the pulse shaper were measured and compared to each other to find a suitable thickness. The experiments were carried out under varying strain rates with a selected thickness for the pulse shaper. The effect of pulse shaper thickness on the rising time, stress-strain relationship, strain rates, and front and back-end stresses during the dynamic deformation period was investigated. Experimentally-obtained data were used to find a bilinear relationship between the failure stresses and the strain rates of bovine femur specimens in both longitudinal and radial directions. The failure strains, however, linearly decreased with increasing strain rates.

Keyword : Dynamic deformation; Split Hopkinson pressure bar (SHPB); Pulse shaper; Bovine femur; Failure stress; Failure strain; Strain rate