The Effect of Specimen Thickness on the Mechanical Behavior of UHMWPE Characterized by the Small Punch Test

2008 ◽  
pp. 192-192-14
Author(s):  
SM Kurtz ◽  
M Herr ◽  
AA Edidin
Keyword(s):  
Mechanical Behavior ◽  
Specimen Thickness ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Mechanical Degradation of Retrieved UHMWPE Tibial Components Characterized by the Small Punch Test

1999 ◽  
Author(s):  
S. M. Kurtz ◽  
C. W. Jewett ◽  
A. Kalinowski ◽  
C. M. Rimnac ◽  
A. A. Edidin
Keyword(s):  
Mechanical Behavior ◽  
Total Joint Replacement ◽  
Mechanical Degradation ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Significant Relationships ◽  
Study Support

Abstract Miniature specimen testing techniques are necessary to characterize the mechanical behavior of UHMWPE components for total joint replacement after sterilization, shelf aging, and implantation. The small punch test has been shown to reproducibly characterize virgin and in vitro aged UHMWPE. The first goal of this study was to demonstrate the feasibility of applying this technology to UHMWPE components after retrieval from the human body. Six short-term retrievals of the same tibial design were characterized with the intent of comparing the mechanical behavior of conventional and enhanced UHMWPE having an extended chain crystalline morphology. Statistically significant relationships were observed between damage scores and the small punch test metrics of initial load, ultimate load, and work to failure. The results of this study support the hypothesis that the in vivo performance of tibial bearings is related to the large deformation mechanical behavior of UHMWPE.

Mechanical Behavior of Aluminum Alloys During Small Punch Test

2011 ◽  
Vol 39 (5) ◽  
pp. 103323
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Matthew Sanders ◽  
Frank Di Bella ◽  
Hong Liang
Keyword(s):  
Aluminum Alloys ◽  
Mechanical Behavior ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

The Role of Elastic and Large-Strain Mechanical Behavior on the Wear of UHMWPE, HDPE, PTFE, and Polyacetal Evaluated by a Hip Simulator

1999 ◽  
Author(s):  
A. A. Edidin ◽  
V. L. Giddings ◽  
S. M. Kurtz
Keyword(s):  
Elastic Modulus ◽  
Wear Rate ◽  
Mechanical Behavior ◽  
Large Deformation ◽  
Contact Stress ◽  
Elastic Behavior ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Hip Simulator

Abstract The elastic and large deformation mechanical behavior of four materials with known clinical performance was examined and correlated with the wear behavior in a hip simulator. Acetabular liners of a commercially-available design were machined from UHMWPE, HDPE, PTFE, and polyacetal and wear tested in a multidirectional hip joint simulator. Elastic and large-deformation mechanical behavior was directly measured from the wear-tested liners using the small punch test. The inverse finite element method was used to compute elastic modulus from the measured small punch test initial stiffness, and the contact stress for the liners was calculated using the theory of elasticity solution. Positive, statistically-significant correlations were observed between the hip simulator wear rate and the initial peak load, ultimate load, and work to failure from the small punch test. Negative correlations were observed between the wear rate and the elastic modulus and contact stress. This results of this study support the hypothesis that the large deformation mechanical behavior of a polymer plays a greater role in the wear mechanisms prevalent in total hip replacements than the elastic behavior.

Evaluation of Mechanical Properties of Hastelloy C-276 Weld by Small Punch Test

2014 ◽  
Vol 941-944 ◽  
pp. 1483-1487 ◽  
Author(s):  
Yan Ma ◽  
Yan Ze Xu ◽  
Shu Yu Zhang ◽  
Chen Lin Lu
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Weld Zone ◽  
Maximum Load ◽  
Specimen Thickness ◽  
Small Punch Test ◽  
Type Specimens ◽  
Small Punch ◽  
Punch Test ◽  
Method Analysis

Mechanical properties of the electron beam weld zone, which are different from the base metal, of Hastelloy C-276 were studied by small punch test (SPT) technology. Load–displacement curves and material properties were obtained by using miniaturized plate-type specimens (3mm diameter×(0.15-0.4) mm thick) from the weld and base metal respectively. The result shows that the maximum load of weld is larger than that of the base metal under the same thickness, meaning the higher strength of the weld. Furthermore, finite element method analysis was performed to investigate the effects of specimen thickness, the diameter of loading ball and the diameter of center hole in holder on the plastic damage of Hastelloy C-276.

Prüfung duktiler Werkstoffe mit dem Small-Punch-Test

2005 ◽  
Vol 47 (1-2) ◽  
pp. 45-54 ◽  
Author(s):  
Meinhard Kuna ◽  
Martin Abendroth
Keyword(s):  
Small Punch Test ◽  
Small Punch ◽  
Punch Test
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