General anisotropy identification of paperboard with virtual fields method

Considine, J.M., Pierron, F., Turner, K.T. and Vahey, D.W. (2014) General anisotropy identification of paperboard with virtual fields method. Experimental Mechanics, 54 (8), 1395-1410. (doi:10.1007/s11340-014-9903-1).

Abstract

This work extends previous efforts in plate bending of Virtual Fields Method (VFM) parameter identification to include a general 2-D anisotropic material. Such an extension was needed for instances in which material principal directions are unknown or when specimen orientation is not aligned with material principal directions. A new fixture with a multi-axial force configuration is introduced to provide full-field strain data for identification of the six anisotropic stiffnesses. Two paper materials were tested and their Q ij compared favorably with those determined by ultrasonic and tensile tests. Accuracy of VFM identification was also quantified by variance of stiffnesses. The load fixture and VFM provide an alternative stiffness identification tool for a wide variety of thin materials to more accurately determine Q 12 and Q 66.

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Contributors

Author: F. Pierron

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