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首页> 外文期刊>Journal of Materials Science. Materials in Medicine >Contact damage in an yttria stabilized zirconia: Implications for biomedical applications
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Contact damage in an yttria stabilized zirconia: Implications for biomedical applications

机译：氧化钇稳定的氧化锆中的接触损伤：对生物医学应用的启示

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摘要

This paper presents the results of a combined experimental and computational study of contact damage in a 3 mole% yttria partially stabilized zirconia (3-YSZ) that is relevant to hip implants and dental restorations. Contact-induced loading in real applications is idealized using Hertzian contact model to explain plasticity phenomena and failure mechanisms observed under monotonic and cyclic loading. Under monotonic loading, the elastic moduli increase with increasing loading levels. Under cyclic loading, the ceramic specimens fail with progressive cone cracking. X-ray analyses reveal that stress-induced phase transformation (from tetragonal to monoclinic phases) occurs under cyclic contact loading above the critical load levels (～8.5 kN). Furthermore, when the cyclic loading level (5.0 kN) is less than a critical load levels (7.5 kN) that is required to induce surface cone cracks, significant plastic damage is observed in the subsurface zone underneath the contact area. These suggest that the cyclic contact loading induce both plastic damage and tetragonal-to-monoclinic phase transformation in the 3-YSZ, leading to significant degradation in long-term strength. The implications of the results are discussed for the design of zirconia femoral heads in total hip replacements and zirconia crowns in dental restoration.
机译：本文介绍了在3摩尔％的氧化钇部分稳定的氧化锆（3-YSZ）中与髋关节植入物和牙齿修复相关的接触损伤的组合实验和计算研究结果。使用Hertzian接触模型可以理想化实际应用中的接触感应载荷，以解释在单调和循环载荷下观察到的可塑性现象和破坏机理。在单调载荷下，弹性模量随载荷水平的增加而增加。在循环载荷下，陶瓷试样会随着渐进的锥形裂纹而失效。 X射线分析表明，在高于临界载荷水平（〜8.5 kN）的循环接触载荷下，应力诱导的相变（从四方相到单斜相）发生。此外，当循环载荷水平（5.0 kN）小于引起表面圆锥裂纹所需的临界载荷水平（7.5 kN）时，在接触区域下方的地下区域中会观察到明显的塑性破坏。这些表明，循环接触载荷在3-YSZ中引起塑性破坏和四方-单斜相转变，从而导致长期强度显着降低。讨论了结果的含义，探讨了全髋关节置换术中氧化锆股骨头的设计以及牙科修复中氧化锆冠的设计。

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