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Articles

Automatic restraint and visual detection of fatigue crack growth when applying an anti-fatigue smart paste to bolt holes

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Pages 229-242 | Published online: 07 Aug 2018
 

ABSTRACT

An anti-fatigue smart paste, which consists of fine alumina particles and silicone grease with low viscosity, was applied to a bolt hole (and its periphery in some cases) in a steel plate specimen, and the effects of the smart paste on automatic restraint and visual detection of fatigue crack growth were experimentally investigated through fatigue tests. Fractographic observations using a scanning electron microscope were also carried out. As a result, approximately 20∼410% increase in failure life was produced by the wedge effect of the alumina particles in the smart paste. When the smart paste was applied, remarkable black colour developed in the white paste along the paths of crack growth, exceedingly facilitating the visual detection of the crack growth.

Additional information

Funding

This study was supported by JSP Science Research Fund 25420040.

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