Application of viscoelastic fracture model and non-uniform crack initiation at clinically relevant notches in crosslinked UHMWPE

Sirimamilla, P. Abhiram; Furmanski, Jevan; Rimnac, Clare M.

doi:10.1016/j.jmbbm.2012.07.008

Cited by 11 publications

(10 citation statements)

References 37 publications

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“…angles and demonstrated rippling associated with larger surface strains before rupture [6,7,27,[42][43][44]. Such features have been associated with local Mode III damage and the gradual accumulation of damage during cyclic loading in a region ahead of the crack tip known as a "process zone" [45,46]. Fracture surfaces from both the RXLPE and VXLPE materials show a marked reduction in these ductile features, consistent with their higher strength from crosslinking.…”

Section: Resultsmentioning

confidence: 88%

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Ansari

Gludovatz

Kozak

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

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Ultrahigh molecular weight polyethylene (UHMWPE) has remained the primary polymer used in hip, knee and shoulder replacements for over 50 years. Recent case studies have demonstrated that catastrophic fatigue fracture of the polymer can severely limit device lifetime and are often associated with stress concentration (notches) integrated into the design. This study evaluates the influence of notch geometry on the fatigue of three formulations of UHMWPE that are in use today. A linear-elastic fracture mechanics approach is adopted to evaluate crack propagation as a function of notch root radius, heat treatment and Vitamin E additions. Specifically, a modified stress-intensity factor that accounts for notch geometry was utilized to model the crack driving force. The degree of notch plasticity for each material/notch combination was further evaluated using finite element methods. Experimental evaluation of crack speed as a function of stress intensity was conducted under cyclic tensile loading, taking crack length and notch plasticity into consideration. Results demonstrated that crack propagation in UHMWPE emanating from a notch was primarily affected by microstructural influences (cross-linking) rather than differences in notch geometry.

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Section: Resultsmentioning

confidence: 88%

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Ansari

Gludovatz

Kozak

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

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“…The findings for crosslinked UHMWPE [27], as well as findings for non-crosslinked UHMWPE [33] support that static creep loading is a dominant mechanism for crack propagation in crosslinked UHMWPE. As a result of this finding, previous studies by the authors [34,35] focused on the role of static creep loading on determining crack initiation time and crack propagation velocity from a notch in crosslinked UHMWPE. It was found that the Williams' viscous fracture model [36] was able to predict both crack initiation and propagation velocity from a notch in two crosslinked UHMWPE formulations.…”

mentioning

confidence: 75%

“…A notch radius of 0.25 mm was implemented. The test specimen geometry was the same as that used in a previous study by the authors [34]. A total of 24 round compact tension specimens were tested under various cyclic loading conditions (described, below).…”

Section: Methodsmentioning

confidence: 99%

Crack initiation from a clinically relevant notch in a highly-crosslinked UHMWPE subjected to static and cyclic loading

Sirimamilla

Rimnac

2019

Journal of the Mechanical Behavior of Biomedical Materials

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Crosslinked Ultra High Molecular Weight Polyethylene (UHMWPE), which is used as a bearing material in total joint replacement components, is subjected to static and cyclic loads in vivo.Resistance to crack initiation from a notch as a function of static and cyclic loads is not well understood for crosslinked UHMWPE. This study estimated the resistance of crosslinked UHMWPE (crosslinked with 100 kGy gamma radiation and remelted to extinguish free radicals) to crack initiation for a clinically relevant notch under both static and cyclic loading conditions. For cyclic loading, four frequencies were applied with a sine waveform and two frequencies were applied with a square waveform to independently estimate the effect of frequency and rate of loading on crack initiation. Crack initiation time and cycles to crack initiation were determined. Crack initiation time for fatigue loading conditions was substantially lower compared to static loading conditions. Crack initiation time decreased with an increase in test frequency. A square wave resulted in shorter crack initiation time compared to a sine wave. The results suggest that crosslinked UHMWPE is more resistant to crack initiation from a notch under static loading conditions compared to fatigue loading conditions.

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“…Moreover the crack initiation from a notch in UHMWPE is a complex phenomenon that is governed by the viscoelastic fracture theory (Sirimamilla [2012]). …”

Section: Creep Testing and Modelingmentioning

confidence: 99%

Ultra High Molecular Weight Polyethylene and its Reinforcement with Carbon Nanotubes in Medical Devices

Guedes

Kanagaraj

Sreekanth

et al. 2015

Polyethylene‐Based Blends, Composites and Nanocomposites

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This chapter discusses the advantages and complexities of ultra high molecular weight polyethylene (UHMWPE) when used as a bearing material for total joint arthroplasty (TJA) and total knee arthroplasty (TKA). The UHMWPE internal structure and its mechanical response depend strongly on a diversity of factors that include radiation crosslinking, fiber reinforcement, and the addition of antioxidants such as Vitamin E or Vitamin C. All these manufacturing procedures induce morphological changes and simultaneously alter the mechanical properties of UHMWPE. The importance of UHMWPE on arthroplasty, including the advantages, the limitations and the strategies devised to overcome the known drawbacks are discussed in the first section. The following sections revise and discuss the biocompatibility, the manufacturing processes, the tribological behaviour, the aging by oxidation and irradiation of UHMWPE and UHMWPE-CNT nanocomposites. The last section analyses the viscoelastic behavior of UHMWPE and its implications on the long-term survival of total joint arthroplasty.

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Application of viscoelastic fracture model and non-uniform crack initiation at clinically relevant notches in crosslinked UHMWPE

Cited by 11 publications

References 37 publications

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Crack initiation from a clinically relevant notch in a highly-crosslinked UHMWPE subjected to static and cyclic loading

Ultra High Molecular Weight Polyethylene and its Reinforcement with Carbon Nanotubes in Medical Devices

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