Mechanical Engineering
GRADUATE SEMINAR
NOTICE OF 2nd PhD SEMINAR PRESENTATION
CANDIDATE: Zackary Fuerth
DEGREE SOUGHT: PhD
DATE: 9/5/2025
TIME: 12:00pm
LOCATION: Room 1101 CEI
TITLE: Investigation on High Temperature Metallic Material Characterization
Abstract
This work investigates the experimental and numerical characterization of metallic materials at elevated temperatures with the aim of improving constitutive modelling and specimen design for superplastic forming applications. Traditional high-temperature tensile testing methods, such as those defined in ASTM E2448, rely on assumptions of uniform deformation and constant strain rates, which limit their accuracy and transferability to industrial forming conditions. A novel calibration procedure was developed to eliminate these assumptions by directly correlating force–displacement data to local strain and strain rate behavior using LS-DYNA simulations. Tensile tests on AA5083 and Ti-6Al-4V alloys revealed significant variability with the ASTM geometry, motivating the design of two alternative specimens: a shortened straight-edged (S-Type) and a curved gauge (R-Type). Both geometries reduced experimental scatter—by up to 72%—and maintained superior model calibration accuracy across a wide strain-rate range. Forming simulations further validated the transferability of the calibrated models, with thickness predictions within ±5% of experimental results. The R-Type geometry was particularly effective, achieving errors as low as 0.05% at short forming times. Ongoing work extends this framework to complex strain paths and high-triaxiality geometries, enabling more reliable material characterization and advancing the predictive capability of constitutive models for high-temperature forming processes.
All Graduate Students are invited to attend