Article: Wielewski, E; Boyce, DE; Park, JS; Miller, MP; Dawson, PR; “A Methodology to Determine the Elastic Moduli of Crystals by Matching Experimental and Simulated Lattice Strain Pole Figures using Discrete Harmonics”, ACTA Materialia, 126:469-480
Abstract: Determining reliable single crystal material parameters for complex polycrystalline materials is a significant challenge for the materials community. In this work, a novel methodology for determining those parameters is outlined and successfully applied to the titanium alloy, Ti-6Al-4V. Utilizing the results from a lattice strain pole figure experiment conducted at the Cornell High Energy Synchrotron Source, an iterative approach is used to optimize the single crystal elastic moduli by comparing experimental and simulated lattice strain pole figures at discrete load steps during a uniaxial tensile test. Due to the large number of unique measurements taken during the experiments, comparisons were made by using the discrete spherical harmonic modes of both the experimental and simulated lattice strain pole figures, allowing the complete pole figures to be used to determine the single crystal elastic moduli. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Funding Acknowledgement: US Office of Naval Research [N00014-12-1-0399]; National Science Foundation; National Institutes of Health/National Institute of General Medical Sciences under NSF [DMR-1332208]
Funding Text: This work was supported by the US Office of Naval Research under award N00014-12-1-0399. This work is based upon research conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF award DMR-1332208