Engineering Transactions, 59, 1, pp. 13–21, 2011

Measurements of Strain-Rate Distributions on Material After Shpb Impact

M. KAWAI
High Energy Accelerator Research Organization

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

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

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

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

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.
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