Miniature specimen shear punch test for UHMWPE used in total joint replacements

Kurtz, Steven M.; Jewett, Charles W.; Bergström, Jörgen; Foulds, J.R.; Edidin, Avram A.

doi:10.1016/s0142-9612(01)00316-7

Cited by 56 publications

(37 citation statements)

References 44 publications

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“…A normal ray was then cast for each triangle of the tibia and a ray-OBB intersection test was performed with the largest OBB. If intersected, the ray-OBB tests continued to subhierarchical levels, ultimately identifying the leaf node (single triangle) of the femoral surface intersected by the ray [26,[28][29][30]. The penetration depth d was defined as the distance from the center of a tibia triangle to the point at which a normal ray intersected the corresponding femoral leaf node.…”

Section: Methodsmentioning

confidence: 99%

Co-Simulation of Neuromuscular Dynamics and Knee Mechanics During Human Walking

Thelen

Choi

Schmitz

2014

Journal of Biomechanical Engineering

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This study introduces a framework for co-simulating neuromuscular dynamics and knee joint mechanics during gait. A knee model was developed that included 17 ligament bundles and a representation of the distributed contact between a femoral component and tibial insert surface. The knee was incorporated into a forward dynamics musculoskeletal model of the lower extremity. A computed muscle control algorithm was then used to modulate the muscle excitations to drive the model to closely track measured hip, knee, and ankle angle trajectories of a subject walking overground with an instrumented knee replacement. The resulting simulations predicted the muscle forces, ligament forces, secondary knee kinematics, and tibiofemoral contact loads. Model-predicted tibiofemoral contact forces were of comparable magnitudes to experimental measurements, with peak medial (1.95 body weight (BW)) and total (2.76 BW) contact forces within 4-17% of measured values. Average root-mean-square errors over a gait cycle were 0.26, 0.42, and 0.51 BW for the medial, lateral, and total contact forces, respectively. The model was subsequently used to predict variations in joint contact pressure that could arise by altering the frontal plane joint alignment. Small variations (62 deg) in the alignment of the femoral component and tibial insert did not substantially affect the location of contact pressure, but did alter the medio-lateral distribution of load and internal tibia rotation in swing. Thus, the computational framework can be used to virtually assess the coupled influence of both physiological and design factors on in vivo joint mechanics and performance.

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Section: Methodsmentioning

confidence: 99%

Co-Simulation of Neuromuscular Dynamics and Knee Mechanics During Human Walking

Thelen

Choi

Schmitz

2014

Journal of Biomechanical Engineering

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“…While samples evaluated by tensile and punch tests result in the derivation of similar types of qualitative data, values determined from tensile tests are not directly comparable to those determined from punch tests [5]. The literature notes an observed linear relationship between data obtained from these two methodologies; however, this relationship is material-specific and information about materials examined herein was not available [6].…”

Section: Mechanical Testingmentioning

confidence: 91%

“… aLOKSAK® clear plastic bags 3 , with hermetic seals designed to exclude air, dust, and moisture from reaching enclosed evidence (herein referred to as aLOKSAK® clear bag)  Griffolyn® 55ASFR white scrim bags 4 , with tear resistance, flame retardant and cold resistance properties (herein referred to as Griffolyn® scrim bag)  Pink SecoVac TM -132 bags 5 , with anti-static properties (herein referred to as PinkPoly bag)  ZiprWeld TM evidence tape 6 , with tamper indication technology  Saf-T-Pak® STP-104 1.25L secondary pressure vessels 7 (herein referred to as Saf-T-Pak® container)  Sarstedt TM screw cap microtubes 8 (herein referred to as Sarstedt DNA vial)  Paper case ID tags…”

Section: Methodsmentioning

confidence: 99%

“…This source was prepared at SRNL. The estimated α activity of the source plate was 2.4x10 5 Bq. To prevent contamination from the Pu source, which was potentially dispersible, during sample exposure a double layer of thin Mylar® was placed between samples and the aliquot, resulting in source attenuation of ~20%.…”

Section: Alpha Sourcementioning

confidence: 99%

“…Samples were irradiated in groups of four arranged across the plane of the planchet, with each exposed directly to the attenuated source and a distance of <0.01 cm. Activity of exposure was measured prior to the first irradiation and was determined to be 1.92x10 5 Bq. Samples were exposed for 27 to 192 hrs.…”

Section: Alpha Sourcementioning

confidence: 99%

See 2 more Smart Citations

Effects of radiation on established forensic evidence containment methods

Ferguson

Duff

Clark

et al. 2011

J Radioanal Nucl Chem

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The Federal Bureau of Investigation (FBI) Laboratory is currently exploring needs and protocols for the storage of evidentiary items contaminated with radioactive material. While a large body of knowledge on the behavior of storage polymers in radiation fields exists, this knowledge has not been applied to the field of forensics and maintaining evidentiary integrity. The focus of this research was to evaluate the behavior of several traditional evidentiary containment polymers when exposed to significant alpha, beta, gamma, neutron and mixed radiation sources. Doses were designed to simulate exposures possible during storage of materials. Several products were found to be poorly suited for use in this specific application based on standardized mechanical testing results. Remaining products were determined to warrant further investigation for the storage of radiologicallycontaminated evidence. AbstractThe Federal Bureau of Investigation (FBI) Laboratory is currently exploring needs and protocols for the storage of evidentiary items contaminated with radioactive material. While a large body of knowledge on the behavior of storage polymers in radiation fields exists, this knowledge has not been applied to the field of forensics and maintaining evidentiary integrity. The focus of this research was to evaluate the behavior of several traditional evidentiary containment polymers when exposed to significant alpha, beta, gamma, neutron and mixed radiation sources. Doses were designed to simulate exposures possible during storage of materials. Several products were found to be poorly suited for use in this specific application based on standardized mechanical testing results. Remaining products were determined to warrant further investigation for the storage of radiologically-contaminated evidence.

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Determination of Activation Volume in Nanocrystalline Cu Using the Shear Punch Test

et al. 2007

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The mechanical behavior of nanocrystalline metals has been a research topic of interest for the past two decades. The current understanding is summarized in several recent reviews. [1][2][3] Researchers have been investigating the deformation mechanisms in nanocrystalline metals and alloys through experimental and modeling routes. [4][5][6][7][8][9][10] Modeling results [8][9][10] indicate that there is a transition from dislocation generation at sources within grains to grain-boundary mediated dislocation generation in the grain size range between about 100 to 10 nm. Below 10 nm, grain boundary deformation modes (sliding, rotation, etc.) become dominant and inverse Hall-Petch effects have been reported. Experimental evidence to confirm these predictions is an active area of research. Two important experimental parameters that are useful in characterizing the deformation kinetics of materials are the strain rate sensitivity m and the activation volume V*. [5,11,12] These are related by m = kT/V*r where k is Boltzmann's constant, T is temperature (K) and r is the stress. There is a limited amount of data available on m and V* measurements for nanocrystalline metals. [4,5,[11][12][13][14] One aspect of this is the fact that research-scale synthesizing techniques often produce small quantities of material and mechanical testing procedures suited to small sample sizes are required. [4,5,7,[13][14][15][16][17][18] In addition to this fact there is a tremendous scarcity of testing methodologies for testing the materials at small scales such as Micro-Electro-Mechanical-Systems (MEMS) where micro tensile and nanoindentation tests are used for understanding the deformation behaviour. [19,20] The aim of the present work was to extend the shear punch test (SPT) technique to the measurement of activation volumes on small scale specimens of few millimeters (∼ 1 mm to 3 mm). The advantage of SPT over nanoindentation and micro tensile tests is the deformation zone where a large number of grains undergo deformation within the shear zone and overcomes the problem of strain gradient plasticity effects, gain size effects as well as the specimen size effects. [21] The SPT has been used for evaluating the yield and ultimate stress by numerous researchers, including us. [21][22][23][24][25][26][27][28] The SPT shear yield or ultimate strength value s can be correlated with its tensile test counterpart r using the relation r = as. The correlation factor a depends upon the testing setup and data analysis methods. [22][23][24][25][26][27][28] The Von Mises (VM) yield criterion predicts a = 3 p if the SPT approximates pure shear loading conditions. This was the case in [21] where the details and standardization of the SPT technique used in the present research work are given.The stress relaxation method has been used to determine activation volumes and dislocation dynamics in coarse-grain metals and alloys [29] and in nanocrystalline Ni. [14] The tests are normally done using uniaxial loading conditions. In the present study, we use the s...

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Miniature specimen shear punch test for UHMWPE used in total joint replacements

Cited by 56 publications

References 44 publications

Co-Simulation of Neuromuscular Dynamics and Knee Mechanics During Human Walking

Co-Simulation of Neuromuscular Dynamics and Knee Mechanics During Human Walking

Effects of radiation on established forensic evidence containment methods

Determination of Activation Volume in Nanocrystalline Cu Using the Shear Punch Test

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