Development of an auxetic surface with high fatigue resistances on acetabular cup for loosening-free

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01208
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Otsuka Yuichi 長岡技術科学大学, 工学研究科, 准教授 (80467084)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 界面破壊力学 / フレッティング疲労 / フレッティング摩耗 / 臼蓋カップ / オーセチック構造 / 水酸アパタイト皮膜

Outline of Final Research Achievements

The damage behavior of the interface between the acetabular cup and simulated bone with an auxetic structure under cyclic loading was experimentally investigated using AE and IR. The results indicated that the disappearance of the singularity model could suppress delamination from the edge of the interface. The number of AEs during the cyclic loading tests of the acetabular cup with the auxetic structure was extremely small, and no significant delamination was observed by optical microscopy after the tests. Therefore, the Auxetic structure suppressed delamination from the interface edge.

Free Research Field

生体材料力学

Academic Significance and Societal Importance of the Research Achievements

臼蓋カップ表面に界面の力学的適合性を保持したオーセチック構造を設計する手法を構築した．これにより圧入時の生体骨へのマイクロき裂損傷の抑制や，繰返し負荷時の界面損傷の抑制が期待され，臼蓋カップのゆるみ発生確率を低減し，人工股関節構造の使用寿命の延伸が期待される，