Affiliations: Department of Health Sciences, Niigata University School of Medicine, Niigata, Japan | Graduate School of Science and Technology, Niigata University, Niigata, Japan | Department of Mechanical Engineering, Niigata University, Niigata, Japan
Note: [] Corresponding author: Koichi Kobayashi, PhD, Department of Health Sciences, Niigata University School of Medicine, 2-746 Asahimachi-Dori, Niigata 951-8518, Japan. Tel.: +81 25 227 0935; Fax: +81 25 227 0935; E-mail: kobayasi@clg.niigata-u.ac.jp.
Abstract: The effects of strain rate and low-gamma irradiation on the compressive properties of ultra-high molecular-weight polyethylene (UHMWPE) were investigated. Gamma irradiation was performed at 30 kGy in nitrogen or at 29 kGy in air without post-irradiation treatment. Quasi-static and impact compressive tests using the split-Hopkinson pressure-bar technique were performed to measure stress–strain relations up to a true strain of 8% at strain rates of between 0.0004 and 260 s−1. For both unirradiated and gamma-irradiated UHMWPE specimens, an increase in the strain rate significantly increased the Young's modulus and the 0.5% yield stress. Gamma irradiation in air significantly increased the Young's modulus, as determined by quasi-static and impact compressive testing, and the 0.5% yield stress, as determined by impact compressive testing. The strain-rate dependence in the power-law relationship was similar to that observed for strain rates ranging from 0.02 to 0.10 s−1 (Kurtz et al., Biomaterials 23, 2002, pp. 3681–3697).
