How to cite this article: Sirimamilla A, Furmanski J, Rimnac C. 2013. Peak stress intensity factor governs crack propagation velocity in crosslinked ultrahigh-molecular-weight polyethylene. J Biomed Mater Res Part B 2013:101B:430–435.
Peak stress intensity factor governs crack propagation velocity in crosslinked ultrahigh-molecular-weight polyethylene†
Article first published online: 19 NOV 2012
Copyright © 2012 Wiley Periodicals, Inc.
Journal of Biomedical Materials Research Part B: Applied Biomaterials
Volume 101B, Issue 3, pages 430–435, April 2013
How to Cite
Sirimamilla, A., Furmanski, J. and Rimnac, C. (2013), Peak stress intensity factor governs crack propagation velocity in crosslinked ultrahigh-molecular-weight polyethylene. J. Biomed. Mater. Res., 101B: 430–435. doi: 10.1002/jbm.b.32850
- Issue published online: 18 MAR 2013
- Article first published online: 19 NOV 2012
- Manuscript Accepted: 4 SEP 2012
- Manuscript Revised: 30 JUL 2012
- Manuscript Received: 15 JAN 2012
- NIH/NIAMS. Grant Number: T32 AR00750
- NIH/NIAMS. Grant Number: R01AR047192
- fatigue crack propagation;
- stress intensity factor;
- crosslinked UHMWPE;
- peak stress intensity
Ultrahigh-molecular-weight polyethylene (UHMWPE) has been successfully used as a bearing material in total joint replacement components. However, these bearing materials can fail as a result of in vivo static and cyclic loads. Crack propagation behavior in this material has been considered using the Paris relationship which relates fatigue crack growth rate, da/dN (mm/cycle) versus the stress intensity factor range, ΔK (Kmax − Kmin, MPa√m). However, recent work suggests that the crack propagation velocity of conventional UHMWPE is driven by the peak stress intensity (Kmax), not ΔK. The hypothesis of this study is that the crack propagation velocity of highly crosslinked and remelted UHMWPE is also driven by the peak stress intensity, Kmax, during cyclic loading. To test this hypothesis, two highly crosslinked (65 kGy and 100 kGy) and remelted UHMWPE materials were examined. Frequency, waveform, and R-ratio were varied between test conditions to determine the governing factor for fatigue crack propagation. It was found that the crack propagation velocity in crosslinked UHMWPE is also driven by Kmax and not ΔK, and is dependent on loading waveform and frequency in a predictable quasistatic manner. This study supports that crack growth in crosslinked UHMWPE materials, even under cyclic loading conditions, can be described by a relationship between the velocity of crack growth, da/dt and the peak stress intensity, Kmax. The findings suggest that stable crack propagation can occur as a result of static loading only and this should be taken into consideration in design of UHMWPE total joint replacement components. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 101B: 430–435, 2013.