Dynamic compressive creep of extruded ultra-high molecular weight polyethylene

Lee, Kwon-Yong; Pienkowski, David; Lee, Sung-Jae

doi:10.1007/bf02982474

Cited by 5 publications

(7 citation statements)

References 16 publications

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“…Further tests are needed to obtain the creep properties of UHMWPE by considering anisotropic and strain recovery characteristics as well as different testing conditions as pointed by Lee and Pienkowski. 29 The distributions of accumulative linear penetration, wear and creep on the PE cup bearing surface, as shown in Figure 5(b) to (d), respectively, closely followed the contact pressure distribution in terms of size and location, as illustrated in Figure 5(a). The linear penetration distribution, shown in Figure 5(b), was found to be similar to the experimental measurement reported by Kang et al 25 The maximum linear penetration computationally predicted was 0.2 mm, which is in the range of experimental measurements, between 0.2 and 0.4 mm, obtained using a CMM from simulator tests, as reported by Galvin et al 21 and Kang et al 25 In Figure 5(c), the maximum wear depth averaged at 0.1 mm was computationally predicted at two separate locations on the bearing surface.…”

Section: Discussionsupporting

confidence: 53%

“…The creep model was based on a uniaxial creep test and developed by Lee and Pienkowski. 29 The creep data were obtained for extruded, unirradiated GUR 4150HP UHMWPE, compressed with constant pressures of 2, 4 and 8 MPa in a 37° bovine serum reservoir for 10,000 min. 29 In this study, creep was modelled for five million cycles and creep recovery was not considered.…”

Section: Methodsmentioning

confidence: 99%

“…29 The creep data were obtained for extruded, unirradiated GUR 4150HP UHMWPE, compressed with constant pressures of 2, 4 and 8 MPa in a 37° bovine serum reservoir for 10,000 min. 29 In this study, creep was modelled for five million cycles and creep recovery was not considered. The creep law was derived as a logarithmic function of time expressed by the creep strain ( ε cr ) as follows where B is the creep constant, 7.97/[log(min)] MPa, 29 p¯' the averaged contact pressure over loading history and t the time length of loading history in minutes.…”

Section: Methodsmentioning

confidence: 99%

“…where B is the creep constant, 7.97/[log(min)] MPa, 29 " p 0 the averaged contact pressure over loading history and t the time length of loading history in minutes.…”

Section: Creep Modelmentioning

confidence: 99%

See 3 more Smart Citations

Computational modelling of polyethylene wear and creep in total hip joint replacements: Effect of the bearing clearance and diameter

Liu

Fisher

Zhang

2012

Proceedings of the Institution of Mechanical Engineers, Part J:

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Computational wear modelling has been improved using a contact area dependent wear law for the conventional ultrahigh molecular weight polyethylene used in total hip joint bearings. The current designs of polyethylene bearings tend to use larger diameter heads to achieve improved motion function for patients in clinical practice, but the wear of the bearing may also increase due to the increase in contact area associated with the larger bearings. Additionally, bearing clearance, which is the difference in diameter or radius between the cup and head bearing surfaces, may also play an important role in affecting the wear. This study particularly investigates the effect of bearing clearance on polyethylene wear, for different femoral head diameters, through a parametric study using the computational modelling method. The effect of creep of polyethylene on the contact area and wear was considered, since polyethylene creep can account for a significantly large proportion of volumetric change, particularly during the initial loading stage, and an increase in the contact area. The predicted wear rate was found to be comparable to the experimental wear rate found in independent simulator tests. The polyethylene bearing with decreased bearing clearances led to a substantial increase in the wear rate, particularly when combined with large diameters.

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Section: Discussionsupporting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…where B is the creep constant, 7.97/[log(min)] MPa, 29 " p 0 the averaged contact pressure over loading history and t the time length of loading history in minutes.…”

Section: Creep Modelmentioning

confidence: 99%

See 2 more Smart Citations

Computational modelling of polyethylene wear and creep in total hip joint replacements: Effect of the bearing clearance and diameter

Liu

Fisher

Zhang

2012

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Therefore, welded MDPE pipes can be considered as defectless during short-term usage, if the defect size is smaller than 15% of the thickness, even when there is no welding bead in the welded joint. Further studies are necessary for long term creep [40] or slow crack growth [41] behavior resulting from the defects.…”

Section: Numerical Simulation and Failure Locationmentioning

confidence: 99%

Effect of defects on the burst failure of butt fusion welded polyethylene pipes

et al. 2016

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With the increasing demand of Medium density polyethylene (MDPE) pipes for gas transmission, the safety concern related with welding defects is becoming a serious matter. In this paper, experimental burst tests and finite element analyses were employed to study butt fusion welded MDPE pipe joints with spherical and planar defects of various sizes. These defects were used to simulate lack of bonding during the welding. Test results showed that in all pipe test cases, the failure location originated from pipe substrates, even though the defect size was increased to 45% of the pipe's wall thickness. The burst pressure could be estimated by the expression employed in the ASME BPVC, and in the burst pressure, the hoop stress was 20.28 MPa. Simulation results showed that the failure position was not only affected by the defect size, but also by the welding bead. It can be argued that a single welding defect whose maximum size is smaller than 15% of the thickness can be used without failure during short-term usage, even when there is no welding bead in the welded joint.

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Experimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions

Dreyer,

Hosseini Nasab,

Favre

et al. 2023

Preprint

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Experimental knee implant wear testing according to ISO 14243 is a standard procedure, but it inherently possesses limitations for preclinical evaluations due to extended testing periods and costly infrastructure. In an effort to overcome these limitations, we hereby develop and experimentally validate a finite element (FE) based algorithm, including a novel cross-shear and contact pressure dependent wear and creep model, and apply it towards understanding the sensitivity of wear outcomes to the applied boundary conditions. Specifically, we investigated the application of in vivo data for level walking from the publicly available "Stan" dataset, which contains single representative tibiofemoral loads and kinematics derived from in vivo measurements of six subjects, and compared wear outcomes against those obtained using the ISO standard boundary conditions. To provide validation of the numerical models, this comparison was reproduced experimentally on a six-station knee wear simulator over 5 million cycles, testing the same implant Stan's data was obtained from. Experimental implementation of Stan's boundary conditions in displacement control resulted in approximately three times higher wear rates (4.4 vs. 1.6 mm3 per million cycles) and a more anterior wear pattern compared to the ISO standard in force control. While a force-controlled ISO FE model was unable to reproduce the bench test kinematics, and thus wear rate, displacement-controlled FE models accurately predicted the laboratory wear tests for both ISO and Stan boundary conditions. The credibility of the in silico wear and creep model was further established per the ASME V&V-40 standard. The model is thus suitable for supporting future patient specific models and development of novel implant designs.

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Dynamic compressive creep of extruded ultra-high molecular weight polyethylene

Cited by 5 publications

References 16 publications

Computational modelling of polyethylene wear and creep in total hip joint replacements: Effect of the bearing clearance and diameter

Computational modelling of polyethylene wear and creep in total hip joint replacements: Effect of the bearing clearance and diameter

Effect of defects on the burst failure of butt fusion welded polyethylene pipes

Experimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions

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