부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.commatsci.2006.01.021 Byline: D.E. Boyce (a), P.R. Dawson (a), B. Sidle (a), T. Gnaupel-Herold (b) Keywords: Finite element; Friction stir welding; Polycrystal; Multiscale Abstract: This paper presents a multiscale simulation methodology for the study of texture and residual strain development applied to deformation of friction stir welded material and includes a coordinated experimental program for model initialization and verification. Based on elastoviscoplastic polycrystal plasticity implemented in a finite element framework, the simulation methodology involves detailed tracking of selected elements in a relatively coarse macroscopic model followed by highly resolved simulations of the selected elements at the microscopic level. The results are compared with neutron diffraction data obtained by subjecting friction stir welded specimens to a program of in situ loadings and unloadings. The model performs well for three different specimen geometries -- both at the macroscopic level in predicting deformed shape, hardness and extension, and at the microscopic level in predicting lattice strain and intensity changes. Author Affiliation: (a) Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, United States (b) University of Maryland, Dept. Materials Science and Engineering, College Park MD 20742, and NIST Center for Neutron Research, 100 Bureau Dr. Stop 8562, Gaithersburg, MD 20899-8562, United States Article History: Received 13 June 2005; Revised 7 December 2005; Accepted 26 January 2006