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Proceedings Paper

Application of plate vibration and DSPI in evaluation of elastic modulus
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Paper Abstract

Due to change in the plate constants/plate stiffness which is a function of elastic modulus, change in natural frequencies takes place. At each natural frequency, the plate has a unique mode shape of vibration which can be easily differentiated from mode shapes at other natural frequencies. In this paper, a technique for the evaluation of the elastic modulus is proposed which is based on the vibration analysis of the plate using digital speckle pattern interferometry (DSPI) and Rayleight's method. Large numbers of experiments were conducted on square aluminium plate for the boundary condition; one edge is fixed and other edges free. The experimental result reveals that a single observation of frequency at first torsional mode is sufficient to evaluate the elastic modulus for all practical purposes. The evaluated experimental error was found to be less than 1%. Ease in sample preparation, simplicity in evaluation, non destructive nature of the DSPI and speed of DSPI has good prospect to evaluate elastic modulus of a material.

Paper Details

Date Published: 3 October 2008
PDF: 8 pages
Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 71550U (3 October 2008); doi: 10.1117/12.814530
Show Author Affiliations
Rajesh Kumar, Sant Longowal Institute of Engineering and Technology (India)
Chandra Shakher, Indian Institute of Technology, Delhi (India)

Published in SPIE Proceedings Vol. 7155:
Ninth International Symposium on Laser Metrology
Chenggen Quan; Anand Asundi, Editor(s)

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