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11 July 2002 Determination of plastic strains from compression tests including the effect of change on Young's modulus
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Abstract
Under compressive loading piezoelectric material shows an interesting change of Young's modulus with increasing compressive strain. This effect is of importance for the determination of plastic strain contributions of stress- strain curves in compression test. Two different possibilities are considered to define plastic strain contributions. To obtain Young's modulus, partial unloading test were performed on a soft PZT material. The applied load was measured with a DC load cell and the related strains were obtained by a pair of strain gauges. In addition to the continuously increased external load small pulse-shaped partial unloadings of about 1 MPa were superimposed. Young's modulus was found to be variable during the mechanical test and increased from 40-70 MPa up to about 130-150 Gpa.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Theo Fett, Marc Kamlah, Dietrich Munz, and Gerhard Thun "Determination of plastic strains from compression tests including the effect of change on Young's modulus", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); https://doi.org/10.1117/12.474963
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