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Interpretation of Diffraction Data from In-situ Stress Measurements during Biaxial Sheet Metal Forming

Published

Author(s)

Thomas H. Gnaupel-Herold, Mark A. Iadicola, Adam A. Creuziger, Timothy J. Foecke, Lin Hu

Abstract

Biaxial yield behavior is determined in-situ through X-ray lattice strain measurements. The distributions of d-spacings in different sample directions is affected both by the changes in diffraction elastic constants (DEC) from evolving texture and by the intergranular (IG) strains. Model predictions were found to be lacking, thus, a hybrid approach was developed based on measurements of DEC and IG strains at selected biaxial deformations. In order to convert measured lattice strains to stress for any given biaxial deformations. In order to convert measured lattice strains to stress for any given biaxial plastic strain a theoretical approximation was fitted to the experimental data, thus allowing the estimation of the evolution of DEC and IG strains with plastic deformation.
Citation
Materials Science Forum

Keywords

Sheet Metal Forming, Stress, Yield, Diffraction, Elastic Constants

Citation

Gnaupel-Herold, T. , Iadicola, M. , Creuziger, A. , Foecke, T. and Hu, L. (2013), Interpretation of Diffraction Data from In-situ Stress Measurements during Biaxial Sheet Metal Forming, Materials Science Forum (Accessed February 26, 2024)
Created September 1, 2013, Updated January 27, 2020