Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
Assessment of two different constitutive models in High Speed Forming
Submission Author:
Rodrigo Rossi , RS , Brazil
Co-Authors:
Andrey Brezolin, Tiago dos Santos, Pedro Rosa, Evandro Paese, Martin Geier, Rodrigo Rossi
Presenter: Tiago dos Santos
doi://10.26678/ABCM.MECSOL2019.MSL19-0091
Abstract
This work presents a numerical study on strain-rate hardening effects in high-speed forming processes considering isothermal conditions. The whole analysis investigates the influence of the adopted constitutive model on the overall mechanical response. According to results available in the literature, at high strain-rates, as in high-speed forming, pronounced rate-induced hardening is expected to occur. In an effort to capture such phenomenon, the model proposed in \citep{dosSantos2016a,TiagoThesis} is adopted. In order to evidence the influence of the adopted constitutive model, two viscoplastic formulations are compared in high-speed forming simulations. That is, numerical results obtained considering dos Santos model are compared to simulations using the traditional Johnson-Cook proposal. Specifically, model parameters adjusted for AA1050 aluminum samples are used. Even though both models were calibrated considering the same material data, substantial contrasts are evidenced in the predicted behavior. The main difference is not only in terms of final displacements but also in terms of the stabilized stress and accumulated viscoplastic strain.
Keywords
Elastoviscoplasticity, Strain-rate hardening, FEM, High speed forming
