Ultra High Molecular Weight Polyethylene (UHMWPE) has been successfully used as a bearing material in total joint arthroplasty for the last 4 decades  but about 5%–10% of the implants undergo revision surgery in the first 10 years of implantation . Crack initiation from a stress-concentration design feature (e.g., a sharp corner of a locking mechanism on an acetabular component) has been observed to lead to catastrophic failure in-vivo . Therefore, it is important to understand crack initiation from clinically relevant notches to mitigate the risk of component fracture. UHMWPE is a semi-crystalline polymer and little is known about the physical mechanisms governing crack tip phenomena. The time dependent theoretical expression of fracture mechanics indicates that the critical fracture energy (Jc) varies with crack initiation time (ti) with an exponent ‘n’ (Equation 1).
- Bioengineering Division
Effect of Non-Uniform Material De-Cohesion on Crack Initiation From Notches in Crosslinked UHMWPE
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Sirimamilla, PA, Furmanski, J, & Rimnac, CM. "Effect of Non-Uniform Material De-Cohesion on Crack Initiation From Notches in Crosslinked UHMWPE." Proceedings of the ASME 2011 Summer Bioengineering Conference. ASME 2011 Summer Bioengineering Conference, Parts A and B. Farmington, Pennsylvania, USA. June 22–25, 2011. pp. 1321-1322. ASME. https://doi.org/10.1115/SBC2011-54012
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