The effects of strain rate and low-gamma irradiation on the compressive properties of UHMWPE.
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).
Kobayashi
Koichi
K
Department of Health Sciences, Niigata University School of Medicine, Niigata, Japan. kobayasi@clg.niigata-u.ac.jp
Kakinoki
Toshihiko
T
Sakamoto
Makoto
M
Tanabe
Yuji
Y
D019245:Compressive Strength; D005720:Gamma Rays; D008422:Materials Testing / Q000295:instrumentation / Q000379:methods; D011095:Polyethylenes / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects*; D013180:Sprains and Strains; D013314:Stress, Mechanical; D013997:Time Factors
D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene