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JRM Vol.29 No.3 pp. 613-618
doi: 10.20965/jrm.2017.p0613
(2017)

Development Report:

Impact Response Measurement of Poly-Urethane Sheet Using an Optical Interferometer

Sa-nga Songmuang*, Akihiro Takita**, and Suphanchai Punthawanunt*

*Faculty of Science and Technology, Kasem Bundit University
1761 Pattanakarn Rd. Suanluang, Bangkok 10250, Thailand

**Faculty of Science and Technology, Gunma University
1-5-1 Tenjin-cho, Kiryu 376-8515, Japan

Received:
July 23, 2016
Accepted:
February 8, 2017
Published:
June 20, 2017
Keywords:
impact absorption, optical interferometer, force measurement
Abstract

Impact Response Measurement of Poly-Urethane Sheet Using an Optical Interferometer

The changes impact force to the sheet

A method for measuring the impact response of a polyurethane sheet is proposed. In the method, the velocity, acceleration, force, and displacement of a spherical body dropping onto the polyurethane sheet is measured using an optical interferometer. Only the velocity is measured from the Doppler shift of the laser light reflected on the cube corner prism embedded inside the spherical body. The optical center of the cube corner prism is made to coincide with the center of gravity of the whole spherical body to minimize the effect of the attitude change of the body. The acceleration, displacement, and inertial force of the body are calculated from the velocity. The dropping body is also observed using a high-speed camera. The uncertainty in measuring the instantaneous value of the impact force with a sampling interval of approximately 0.1 ms is estimated to be 0.23 N, which corresponds to 0.14% of the maximum force of approximately 1.60×102 N. In the experiment, 10 drop measurements are conducted and show good reproducibility of this method.

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Last updated on Nov. 10, 2017