Effective X-Ray Elastic Constant Measurement for In Situ Stress Measurement of Biaxially Strained AA5754-O
Mark A. Iadicola, Thomas H. Gnaeupel-Herold
A method of measuring biaxial stress-strain curved for sheet metal samples subjected to large plastic strains is described for one example aluminum alloy (AA 5754-O). The method uses a prtable X-ray diffraction (XRD) system to measure in situ stresses during tensile deformations. Calibration of X-ray elastic constants and the effects of texture and itergranularstresses are discussed. Comparison of uniaxial data measured using XRD and standard methods show good agreement, and biaxial stress-strain results show good repeatability. Accurate measurement of stresses by X-ray diffraction requires accurate X-ray elastic contants. Calbiration experiments are one method to determine these for a specific material in a specific condition. Typically elastic uniaxial tension or bending tests are used to determine the required effective X-ray elastic constants.
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Effective X-Ray Elastic Constant Measurement for In Situ Stress Measurement of Biaxially Strained AA5754-O, Materials Science and Engineering, [online], https://doi.org/10.1016/j.msea.2012.02.100
(Accessed September 22, 2023)