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Experimental System and Validation for Energy-Based Characterization

[+] Author Affiliations
Jan Wei Pan, Jinquan Cheng, Tomonari Furukawa

Virginia Polytechnic Institute and State University, Danville, VA

Athanasios P. Iliopoulos

Science Applications International Corporation - Naval Research Laboratory, Washington, DC

John G. Michopoulos

Naval Research Laboratory, Washington, DC

Paper No. DETC2011-48902, pp. 537-542; 6 pages
doi:10.1115/DETC2011-48902
From:
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 31st Computers and Information in Engineering Conference, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5479-2
  • Copyright © 2011 by ASME

abstract

This paper presents the experimental system and experimental validation of an energy-based characterization for the identification of elastic constants. Unlike the standard uniaxial testing machine, which uses a contact strain sensor such as extensometer, the developed system uses a non-contact optic sensor as an advantage to measure and derive external work and strain measurements for characterizing the elastic constants. To investigate the validity of the energy-based characterization, a graphical user interface and the experimental system were developed for the tensile tests of aluminum open-hole specimens. During the validation, the means and variances of the characterization results were analyzed. The reliability of its recursive estimation was further investigated by the convergence of covariance at every new measurement. Results showed that the recursive estimation allows identification of elastic constants of a test coupon at every acquisition of sensor data in an online manner. The identification of all the constants during deformation thus demonstrated the overall validity and efficiency of the energy-based characterization.

Copyright © 2011 by ASME

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