Engineering Transactions, 59, 1, pp. 13–21, 2011
10.24423/engtrans.157.2011

Measurements of Strain-Rate Distributions on Material After Shpb Impact

M. KAWAI
High Energy Accelerator Research Organization, Tsukuba
Japan

M. FUTAKAWA
J-PARC Center, Japan Atomic Energy Agency, Tokai-mura
Japan

T. NAOE
J-PARC Center, Japan Atomic Energy Agency, Tokai-mura
Japan

H. YAMADA
National Institute of Advanced Industrial Science and Technology (AIST), AIST Kyushu, Tosu
Japan

C. N. XU
National Institute of Advanced Industrial Science and Technology (AIST), AIST Kyushu, Tosu
Japan

We have proposed a sophisticated novel method of the SHPB experiment to measure the local strain-rate 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 by a typical mechanoluminescent material -Eu doped SrAl2O4 film, in order to obtain the fundamental data for the method. Our results showed that SrAl2O4: Eu emitted lights as a response to the stress. Increase of the light intensity was swift enough to follow the strain change due to SHPB impact. The luminescence intensity was experimentally verified and expressed as a 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.
Keywords: strain distributions; local strain-rate; luminescence intensity
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

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DOI: 10.24423/engtrans.157.2011