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Journal article
Notched stress-strain behavior of a conventional and a sequentially annealed highly crosslinked UHMWPE
Biomaterials, v 29(35), pp 4575-4583
01 Dec 2008
PMID: 18801567
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Abstract
Contemporary total joint replacement designs contain stress-risers such as fillets, grooves, and undercuts; therefore, it is of interest to analyze the behavior of UHMWPEs in the presence of such design-related stress-risers. This study examined the engineering and true axial stress-strain behavior of smooth cylindrical and notched cylindrical test specimens, under applied axial tensile loading (2 displacement rates, 37 degrees C) for a conventional and a highly crosslinked second generation UHMWPE. Both materials were prepared from ram extruded GUR 1050. The conventional material (30 kGy) was gamma sterilized at 30 kGy in an inert N-2 environment. The sequentially annealed material (SA) was gamma irradiated at 30 kGy and annealed for 8 h at 130 degrees C. The irradiation-annealing process was repeated two more times for an overall irradiation dose of 90 kGy. Differential scanning calorimetry (DSC) was utilized to investigate changes in crystallinity and lamellar thickness distributions upon loading. Fractographic analysis of scanning electron microscope (SEM) images of fracture surfaces was performed to investigate changes in fracture micromechanism with notching. Both the 30 kGy and SA materials, in the smooth condition, demonstrated substantial ductility and orientation hardening. With the introduction of a notch, both materials demonstrated an elevation in the yield stress (notch strengthening) and a reduction in the ultimate stress and ultimate strain at both displacement rates. Additionally, it was found that the uniaxial stress-state (smooth condition) allowed for greater changes in crystallinity and the lamellar thickness distributions, when compared to the untested materials, than the triaxial stress-state induced by the notched geometry. (c) 2008 Elsevier Ltd. All rights reserved.
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Details
- Title
- Notched stress-strain behavior of a conventional and a sequentially annealed highly crosslinked UHMWPE
- Creators
- Michael C. Sobieraj - Case Western Reserve UniversitySteven M. Kurtz - Exponent (United States)A. Wang - Stryker (United States)Michael M. Manley - StrykerClare M. Rimnac - Case Western Reserve University
- Publication Details
- Biomaterials, v 29(35), pp 4575-4583
- Publisher
- Elsevier
- Number of pages
- 9
- Grant note
- Stryker orthopaedics R01AR047192 / NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Arthritis & Musculoskeletal & Skin Diseases (NIAMS) AR 47192; T 32 GM07250 / NIH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA T32GM007250 / NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of General Medical Sciences (NIGMS) Mettler-Toledo
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000261864400001
- Scopus ID
- 2-s2.0-53149092429
- Other Identifier
- 991019167445704721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- Web of Science research areas
- Engineering, Biomedical
- Materials Science, Biomaterials