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Presentation Title：Trial Manufacture and Performance Evaluation of Fatigue Crack Growth Restraining Sheets Using a High Water Content Gel – Utilizing Wedge Effects of Products in Cracks –

The recipient of the award：Ichihiko Takahashi

About awarded research：
Simple techniques of restraining fatigue crack growth utilizing wedge effects of products in cracks were newly proposed and experimentally tested. Crack growth restraining sheets with a high water content gel were manufactured by way of trial and applied to notched plate specimens of steel or aluminium alloy, and the efficacy of the sheets to restrain crack growth was evaluated by fatigue tests. In order to find a local humid (or wet) environment, which is most suitable for the crack growth restraint by wedge effects of products on the crack surfaces, water components absorbed in the gel and effects of a cathode or an anode layer as promoting factors of the electrochemical reactions were comparatively examined.