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Measurements of time-dependent stress distribution on material after HP impact

ホプキンソン棒衝撃後の応力分布における時間依存性の計測

川合 將義*; 二川 正敏; 直江 崇 ; Xu, C.-N.*; 山田 浩志*

Kawai, Masayoshi*; Futakawa, Masatoshi; Naoe, Takashi; Xu, C.-N.*; Yamada, Hiroshi*

ホプキンソン棒実験における試験片表面の二次元的なひずみ分布の時刻歴応答を計測するための手法として、応力発光材と高速度ビデオカメラを用いる斬新な手法を考案した。まず、基礎データを取得するために、アルミニウムに応力発光材(SrAl$$_2$$O$$_4$$: Eu)を塗布した試験片を製作し、ホプキンソン棒で負荷した$$dot{epsilon}<50$$s$$^{-1}$$の範囲ではひずみ変化に十分追従する発光輝度の時刻歴変化を観測した。さらに、発光輝度は、ひずみとひずみ速度の積で表されることを実験的に示した。本手法は、二次元的なひずみ分布の時刻歴応答を計測するのに有用である。

We have proposed a sophisticated novel method of the SHB experiment to measure the time-dependent local strain distributions on a surface of the specimen by using mechanoluminescent materials combined with a high-speed camera and an image intensifier. The feasibility study was made for the aluminum specimens pasted with a typical mechanoluminescent material -Eu doped SrAl$$_2$$O$$_4$$ film, in order to obtain the fundamental data for the method. Our results showed that SrAl$$_2$$O$$_4$$: Eu emitted lights as a response to the strain. Rise up of the light intensity was swift enough to follow the strain change due to HP impact. The luminescence intensity was experimentally verified and expressed as product of strain and strain rate. Accordingly, it can be said that this method gives a good tool for measuring time variation of local strain distributions.

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