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IJAT Vol.13 No.6 pp. 736-742
doi: 10.20965/ijat.2019.p0736
(2019)

Technical Paper:

Visualization of Stress Distribution by Photoelastic Method Under Ultrasonic Grinding Condition

Hiromi Isobe*,†, Natsuki Sasada*, Keisuke Hara**, and Jun Ishimatsu***

*Nagaoka University of Technology
1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan

Corresponding author

**National Institute of Technology, Ichinoseki College, Ichinoseki, Japan

***Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia

Received:
March 21, 2019
Accepted:
June 24, 2019
Published:
November 5, 2019
Keywords:
ultrasonic vibration, difficult-to-cut material, photo-elasticity, stress distribution, computed tomography
Abstract

This study investigates phenomena in ultrasonic vibration-assisted grinding. The appropriateness of a stress visualization method is proven through comparison of a Hertzian contact stress analysis using finite element methods. The stress distribution on soda-lime glass caused by a 3-mm-diameter diamond electro-deposited wheel is visualized using a photo-elasticity method. The study compares the local stress concentrations caused by grains with and without ultrasonic wheel vibration. The global reaction force is measured by a dynamometer. The ultrasonic vibration leads to a reduced fluctuation of force, as well as a reduced time-averaged force. It is thought that the ultrasonic vibration causes a smaller local stress beneath the grains, which generates chips. In contrast, typical photo-elasticity methods are applicable for plane stress conditions. However, the stress distribution in a workpiece under a face grinding condition is distributed three-dimensionally, and the stress distribution cannot be recognized directly from the phase difference. Assuming that the stress distribution is sufficiently stable in a wheel rotation, continuously-captured images can be reconstructed to produce a 3D stress distribution, using computed tomography. The experimental tomographic images show a spatially-dispersed phase difference image caused by the electro-deposited wheel, with several discontinuous diamond grains on the end face of the wheel.

Cite this article as:
H. Isobe, N. Sasada, K. Hara, and J. Ishimatsu, “Visualization of Stress Distribution by Photoelastic Method Under Ultrasonic Grinding Condition,” Int. J. Automation Technol., Vol.13, No.6, pp. 736-742, 2019.
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