Development of Ti-Ni alloy as a stress shielding biomaterial

本研究的目的是评估钛镍合金的冲击应力传递的生物医学应力屏蔽。采用分离式Hopkinson压杆技术对钛镍合金、纯钛和不锈钢圆柱试样进行了冲击压缩试验。结果表明，脉冲通过钛镍合金的透射比通过钛和不锈钢的透射要低得多。Ti-Ni合金和纯钛的初始应力降低幅度较大，但Ti-Ni合金的应力降低比纯钛的应力降低更连续。入射脉冲与透射脉冲之间的应力差最大值通过Ti-Ni合金或钛高于通过不锈钢，而最大应力通过Ti-Ni合金的应力降低值大于通过钛或不锈钢。Ti-Ni合金传递的冲击应力小于钛或不锈钢，这表明使用Ti-Ni合金作为植入系统的组成材料可以降低对邻近组织的加载应力。用DSC研究了影响应力传递的重要因素--合金的相变行为。

The purpose of this research was to evaluate the impact stress transmission of Ti-Ni alloy for biomedical stress shielding. An impact compression test was carried out with use of split-Hopkinson pressure-bar technique with cylindrical specimens of Ti-Ni alloy, titanium and stainless steel. As a result, the transmitted pulse through Ti-Ni alloy was considerably depressed as compared with those through titanium and stainless steel. The initial stress reduction was large through Ti-Ni alloy and titanium, but the stress reduction through Ti-Ni alloy was much more continuous than titanium. The maximum value in the stress difference betweeen incident and transmitted pulses throgh Ti-Ni alloy or titanium was higher than that through stainless steel, while the stress reduction in the maximum stress through Ti-Ni alloy was statistically larger than that through titanium or stainless steel. Ti-Ni alloy transmitted less impact stress than titanium or stainless steel, which suggested that the loading stress to adjacent tissues could be decreased with use of Ti-Ni alloy as a component material in an implant system. Transformation behavior of the alloy, which is an important factor on the stress transmission, were alos investigated by means of DSC.