Kim, You-Chu

Sakagami, Takahide

Sakino, Yoshihiro

A sacrificial test piece is used as a specimen attached to the member of a main structure to evaluate the damage before the appearance of a crack in a member of a bridge. If the crack length of the sacrificial test piece can be measured from a long distance, the damage in a member of the bridge can be evaluated more easily and cheaply. In this paper, thin steel plates, which have initial cracks at the center, are used as sacrificial test pieces and a measuring method by self-reference lock-in thermography is proposed. Fatigue tests of the sacrificial test pieces were performed and crack lengths were measured by the proposed method from a long distance. As the result, it is ascertained that the crack length of the sacrificial test piece can be measured from a long distance by the proposed method in the case that the stress range is 30MPa or more, even if the frequency is as small as 3Hz

Osaka University Knowledge Archive

Application of Self-Reference Lock-in Thermography to the Measurement of Fatigue Damage Parameter

https://ir.library.osaka-u.ac.jp/repo/ouka/all/10914/jwri37_02_081.pdf

Application of Self-Reference Lock-in Thermography to the Measurement of Fatigue Damage Parameter

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