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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Compressive creep characteristics of extruded ultrahigh-molecular-weight polyethylene.
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Compressive creep characteristics of extruded ultrahigh-molecular-weight polyethylene.

机译：挤出超高分子量聚乙烯的压缩蠕变特性。

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摘要

The static compressive creep behavior of ultrahigh-molecular-weight polyethylene (UHMWPE) was studied under physiologic conditions. Specimens were machined from the center and periphery of extruded GUR 4150HP rod stock and were subjected to constant pressures of 2, 4, or 8 MPa for intervals as long as 10(4) min. The creep strain (creep divided by initial thickness) was compared to the pressure and duration of loading by using analysis of variance and linear regression analysis. The amount of creep strain increased rapidly in the early period of testing and was followed by a reduced rate of creep, which reached a steady state after approximately 4000 min. The amount and rate of creep strain increased linearly with pressure. Surprisingly, the rate of creep strain varied with the radial position in the rod stock: specimens obtained from the periphery had 8-19% larger creep strain rates than did specimens obtained from the center (p = 0.1 to p < 0.001). These results advance the characterization of creep's contribution to the in vivo penetration of the metallic component into the UHMWPE component, thereby facilitating the measurement of true in vivo wear. These data also help explain the azimuthally nonuniform deformation observed in retrieved acetabular cups.
机译：在生理条件下研究了超高分子量聚乙烯（UHMWPE）的静态压缩蠕变行为。从挤出的GUR 4150HP棒料的中心和外围加工样品，并使其承受2、3、4或8 MPa的恒定压力，间隔长达10（4）分钟。通过使用方差分析和线性回归分析，将蠕变应变（蠕变除以初始厚度）与压力和载荷持续时间进行了比较。在测试的早期，蠕变应变的数量迅速增加，随后蠕变速率降低，大约在4000分钟后达到稳态。蠕变应变的数量和速率随压力线性增加。出乎意料的是，蠕变应变率随棒料中的径向位置而变化：从外围获得的样本的蠕变应变率比从中心获得的样本大8-19％（p = 0.1至p <0.001）。这些结果促进了蠕变对金属成分在体内渗透到UHMWPE成分中的贡献的表征，从而有助于测量真实的体内磨损。这些数据还有助于解释在取出的髋臼杯中观察到的方位角不均匀变形。

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