Compliance calibration for fatigue crack propagation testing of ultra high molecular weight polyethylene

Varadarajan, Ravikumar; Rimnac, Clare M.

doi:10.1016/j.biomaterials.2006.05.003

Cited by 18 publications

(13 citation statements)

References 11 publications

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“…The compliance method is, therefore, popular, well accepted and widely applied to obtain the fracture toughness of metals [13][14][15][16] and ceramics. [6,17] Inspired by these excellent results, the method was adopted to determine fracture characteristics for other materials that are not linear elastic and isotropic, such as bone [18][19][20][21] and polymers, including reinforced [22,23] and nonreinforced thermoplastics, [24], which includes ultra-high molecular weight polyethylene [25,26] and polyethylene pipe grades. [27][28][29][30] It is not trivial to apply a method developed for linear elastic behaviour on non-linear, time dependent materials where the (apparent) modulus strongly depends on loading conditions and loading time.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

2015

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Section: A N U S C R I P Tmentioning

confidence: 99%

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

2015

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“…Several points are chosen in the SBZ (Figure 1a). J is computed at these points using the load and displacement at these points and the initial crack length, a o (Equation 6) (6) where, U is the area under load vs. displacement curve. The crack is then given forced blunting extension as described by (7) where a b is the crack length at the forced blunting calibration points, m is the crack tip constraint factor, and σ y is the flow stress of the material.…”

Section: 12mentioning

confidence: 99%

“…(8) (9) Once the instantaneous crack length values are determined, instantaneous values of J can be evaluated using equation 6. From the instantaneous values of J and a, the J-R curve can be obtained.…”

Section: Lmn Function Based Deformation Function-to Obtain the Constamentioning

confidence: 99%

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Static fracture resistance of ultra high molecular weight polyethylene using the single specimen normalization method

2008

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Fracture of Ultra High Molecular Weight Polyethylene (UHMWPE) components used in total joint replacements is a clinical concern. UHMWPE materials exhibits stable crack growth under static loading, therefore, their fracture resistance is generally characterized using the J-R curve. The multiple specimen method recommended by ASTM for evaluation of the J-R curve for polymers is time and material intensive. In this study, the applicability of a single specimen method based on load normalization to predict J-R curves of UHMWPE materials is evaluated. The normalization method involves determination of a deformation function. In this study, the J-R curves obtained using a power law based deformation function and the LMN curve based deformation function were compared. The results support the use of the power law based deformation function when using the single specimen approach to predict J-R curves for UHMWPE materials.

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“…Varadarajan et al employed a similar technique while creating compliance calibration curves of ultra high molecular weight polyethylene which was irradiated at different doses (Varadarajan and Rimnac, 2006). Malik, et al used the technique on equine third metacarpal bone material, with the crack propagating transverse to the longitudinal axis of the bone.…”

Section: Introductionmentioning

confidence: 99%

Compliance calibration for fracture testing of anisotropic biological materials

Creel

Stover

Martin

et al. 2009

Journal of the Mechanical Behavior of Biomedical Materials

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The compliance technique has been used to monitor crack length during fracture and fatigue testing of materials. Difficulties arise when this technique is applied to anisotropic biological materials such as bone. In this tutorial, two different methods of analyzing compliance calibration data are described: the standard ASTM method and a new approach developed by the authors specifically for anisotropic materials. An example is given showing how data from equine cortical bone can be analyzed. In this example, calibration tests were conducted on thirty-six three point bend specimens machined from the mid-diaphysis of six pairs of equine third metacarpal bones. Cracks were propagated in three orientations with respect to the long axis of the bone: transverse, longitudinal, and radial. Specimen compliance was determined for a crack range of 0.30 to 0.65 times the specimen width from load vs. crack opening displacement data. The results demonstrate that the ASTM method is not applicable to anisotropic biomaterials such as bone. Rather, it is necessary to develop separate compliance calibration equations for each crack propagation orientation investigated.

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Compliance calibration for fatigue crack propagation testing of ultra high molecular weight polyethylene

Cited by 18 publications

References 11 publications

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

Static fracture resistance of ultra high molecular weight polyethylene using the single specimen normalization method

Compliance calibration for fracture testing of anisotropic biological materials

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