The Mechanical Properties and Modeling of Creep Behavior of UHMWPE/Nano-HA Composites
- PDF / 1,713,227 Bytes
- 8 Pages / 593.972 x 792 pts Page_size
- 95 Downloads / 182 Views
JMEPEG (2017) 26:4514–4521 DOI: 10.1007/s11665-017-2913-2
The Mechanical Properties and Modeling of Creep Behavior of UHMWPE/Nano-HA Composites Fan Li, Lilan Gao, Hong Gao, and Yun Cui (Submitted March 2, 2017; in revised form May 17, 2017; published online September 5, 2017) Composites with different levels of hydroxyapatite (HA) content and ultra-high molecular weight polyethylene (UHMWPE) were prepared in this work. Mechanical properties of the composites were examined here, and to evaluate the effect of HA particles on the time-dependent behavior of the pure matrix, the creep and recovery performance of composites at various stress levels were also researched. As expected, the addition of HA influenced the time-dependent response of the UHMWPE and the effect had a strong dependence on the HA content. The creep and recovery strain of the composites significantly decreased with increasing HA content, and tensile properties were also impaired, which was due to the concentration of HA fillers. The mechanism and effect of HA dispersed into the UHMWPE matrix were examined by scanning electron microscopy. Additionally, since variations in the adjusted parameters revealed the impact of HA on the creep behavior of the UHMWPE matrix, FindleyÕs model was employed. The results indicated that the analytical model was accurate for the prediction of creep of the pure matrix and its composites. Keywords
composites, UHMWPE
creep,
FindleyÕs
model,
tensile,
1. Introduction Ultra-high molecular weight polyethylene (UHMWPE) possesses a series of unique mechanical properties in terms of chemical stability, impact resistance, friction resistance, stress crack resistance and biocompatibility in the human body and has been successfully applied as a gasket material for joint prostheses for more than five decades (Ref 1, 2). The exceptional mechanical integrity of this polymer is attributed to its very high molecular weight, moderate crystallinity, high tie molecule density and chain entanglements (Ref 3, 4). Nevertheless, recently it has been determined that abrasion damage to UHMWPE total joint components is a common clinical problem that limits the lifetime of joint prostheses. Additionally, delamination caused by long-term clinical use has been shown to result in loosening and infection in total joint replacements, which constitutes about three quarters of all repair surgeries (Ref 5, 6). To decrease the possibility of mechanical breakdown and reduce debris-induced osteolysis surrounding the artificial joint, a series of studies have been completed that have utilized techniques such as radiation cross-linking, recrystallization, self-reinforcement and filler, in an effort to expand the service life of the prostheses. As a result of these Fan Li and Hong Gao, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China; Lilan Gao, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PeopleÕs Republic of China and School of Mechanical Engineering, Tianjin Un
Data Loading...
