Study on applicability and influencing factors of an anti-fatigue smart material

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420040
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: National Maritime Research Institute
• Principal Investigator: TAKAHASHI ICHIHIKO 国立研究開発法人 海上技術安全研究所, その他部局等, 上席研究員 (30425748)
• Co-Investigator(Kenkyū-buntansha): TANAKA YOSHIHISA 国立研究開発法人海上技術安全研究所, その他部局等, 主任研究員 (70399517)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 疲労き裂 / スマート材料 / 耐疲労スマートペースト / くさび効果 / き裂進展抑制 / き裂検出 / チクソトロピー / ボルト穴

Outline of Final Research Achievements

Validity of an anti-fatigue smart paste, which is a mixture of fine and very hard particles and a viscous fluid, has been experimentally confirmed when applied to various enclosed spaces such as bolt holes, microcapsules or welding roots. Also the influencing factors, such as viscosity of the paste, particle material and particle size, have been comparatively studied. Concerning the crack retardation phenomenon by the wedge effect of foreign matter in a crack, crack growth analyses have been carried out using finite element models, and the thickness and forming range of the wedge have been quantitatively examined invoking the actual crack growth data. In addition, a new method of visual detection of cracks using viscous fluid with high thixotropy was invented and validated experimentally.

Free Research Field

金属疲労、海洋工学