Development of a prediction method for loosening lives of acetabular cups by considering delamination/wear of surface coating and clearances

2015 Fiscal Year Final Research Report

• Project/Area Number: 26870213
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Medical engineering assessment; Materials/Mechanics of materials
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Otsuka Yuichi 長岡技術科学大学, その他の研究科, 准教授 (80467084)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 水酸アパタイト溶射皮膜 / 臼蓋カップ / 設置公差 / ゆるみ / フレッティング摩耗 / はく離 / 界面 / 破壊力学

Outline of Final Research Achievements

This study aims at developing a prediction method for loosening lives of acetabular cups by considering localized wear/ delamination by clearances in placing of the cups. In-situ observation revealed that delamination at interfaces between HAp coating with substrate accelerated wear of HAp coating. Cyclic loading system for acetabular cups /stem components has been assembled. Rotational displacements of the acetabular cups were promoted by delamination / wear of HAp coating in cases of larger clearance. FEA also demonstrated that longer delamination length or higher Young’s modulus of simulated fixing bones led to higher wear rates of HAp coating, which may result in shorter loosening lives of the acetabular cups.

Free Research Field

機械材料・材料力学