The effect of specimen thickness on the mechanical behavior of UHMWPE characterized by the small punch test

被引:0
作者
Kurtz, SM [1 ]
Herr, M [1 ]
Edidin, AA [1 ]
机构
[1] Exponent Inc, Philadelphia, PA 19104 USA
来源
CROSSLINKED AND THERMALLLY TREATED ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE FOR JOINT REPLACEMENTS | 2004年 / 1445卷
关键词
small punch test; mechanical properties; ultra-high molecular weight; polyethylene; UHMWPE;
D O I
10.1520/STP11931S
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The small punch test has been validated for Ultra High Molecular Weight Polyethylene (UHMWPE) in ASTM F 2183-02. Because only a limited volume of material may be available from retrieved components, reducing the specimen size may increase the number of test specimens. It is unknown if the reduction in specimen thickness will affect the small punch metrics. Therefore, the goal of this study was to examine the relationship between the small punch specimen thickness and the test metrics. Ram extruded GUR 1050 UHMWPE was used to make 5 small punch specimens (diameter 6.35 mm) for each of four different thicknesses: 0.25 mm, 0.33 mm, 0.43 mm, and 0.5 mm. Specimens were tested following ASTM F 2183-02. Power law-based scaling relationships were observed between normalized specimen thickness and the normalized peak load, ultimate load, and work-to-failure of the small punch test (R-2 = 0.99, R-2= 0.99, and R-2=0.94, respectively). A nearly cubic relationship was observed between the normalized specimen thickness and the normalized initial stiffness, which was proportional to the elastic modulus of the UHMWPE, and was predicted based on beam theory (R-2 =0.99). The results of this study provide indication of a reliable means for normalizing small punch test measurements to account for variations in specimen thickness.
引用
收藏
页码:192 / 205
页数:14
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