Work

Polycrystal plasticity modeling of the anisotropy of Ti-6Al-4V under static & dynamic loadings

Year: 2025

Type: article

Abstract: Traditionally, sheet metal-forming involves deforming a thin metal sheet at relatively low strain rates. However, to enhance productivity and formability, the adoption of high strain rates in metal-forming processes has gained momentum in recent years. In this study, the visco-plastic self-consistent (VPSC) model was employed to investigate the evolution of the Lankford coefficients ( r -values) in Ti-6Al-4V sheet metal, measured through tensile testing at 15° increments between the rolling and transverse directions, across three nominal strain rates: 8 ⋅ 10 − 5 , 0.5, and 1000 s − 1 . The VPSC results demonstrated that optimizing latent hardening coefficients is an effective approach for modeling the evolution of r -values across different strain rates. The variations in slip system activities across different loading directions offer valuable insight into the evolution of r -values between low and high strain rates. • The evolution of r -values in Ti-6Al-4V captured experimentally shows distinct trends under static and dynamic strain rates. • VPSC models elucidate the influence of slip system latent hardening on the evolution of r-values under varying strain rates. • Experimentally measured r-values under different loading directions can serve as validation metrics to refine VPSC models.

Source: Materials Characterization

DOI: 10.1016/j.matchar.2025.115037

Authors: Rajib Halder, Luca Corallo, Patricia Verleysen, Leo Kestens, Anthony D. Rollett

Institutions: Carnegie Mellon University, University of Catania, Ghent University

Language: English

Topic: Microstructure and mechanical properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,320

Funder: Fondation Francqui - Stichting