title: Three dimensional image-based simulation of ultrasonic wave propagation in polycrystalline metal using phase-field modeling.
abstract: When modeling ultrasonic wave propagation in metals, it is important to introduce mesoscopic crystalline structures because the anisotropy of the crystal structure and the heterogeneity of grains disturb ultrasonic waves. In this paper, a three-dimensional (3D) polycrystalline structure generated by multiphase-field modeling was introduced to ultrasonic simulation for nondestructive testing. 3D finite-element simulations of ultrasonic waves were validated and compared with visualization results obtained from laser Doppler vibrometer measurements. The simulation results and measurements showed good agreement with respect to the velocity and front shape of the pressure wave, as well as multiple scattering due to grains. This paper discussed the applicability of a transversely isotropic approach to ultrasonic wave propagation in a polycrystalline metal with columnar structures.
authors.affiliation: Department of Civil and Environmental Engineering, Ehime University, 3 Bunkyo, Matsuyama, Ehime 790-8577, Japan. Electronic address: nakahata@cee.ehime-u.ac.jp.
authors.forename: K
authors.initials: K
authors.lastname: Nakahata
authors.affiliation: Department of Civil and Environmental Engineering, Ehime University, 3 Bunkyo, Matsuyama, Ehime 790-8577, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sugahara
authors.affiliation: Fraunhofer Institute for Ceramic Technologies and Systems - Branch Materials Diagnostics, Maria-Reiche-Strasse 2, 01109 Dresden, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Barth
authors.affiliation: Fraunhofer Institute for Ceramic Technologies and Systems - Branch Materials Diagnostics, Maria-Reiche-Strasse 2, 01109 Dresden, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Köhler
authors.affiliation: Fraunhofer Institute for Ceramic Technologies and Systems - Branch Materials Diagnostics, Maria-Reiche-Strasse 2, 01109 Dresden, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Schubert
keywords: Finite-element method; Grain scattering; Mesoscopic metal structure; Multiphase-field modeling; Wave simulation