SYMPOSIA PAPER Published: 01 August 2022
STP163820210024

A New Methodology for Determination of Biaxial Tensile Behavior of AA7075-T6 Sheet Using Hot Gas Bulge Forming

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There has been an increasing interest in fabricating automotive components from copper (Cu)–lean 7xxx-series aluminum (Al) alloys to produce structural components to achieve higher in-service strength and to reduce weight and cost (compared to steel). Within the 7xxx series, AA7075-T6 is used in aerospace and other structural applications that require high strength. One major technical issue preventing the widespread utilization of higher-strength AA7075-T6 is the poor ductility at room temperature. Warm forming offers a potential means to overcome this limitation. Since AA7075-T6 is a precipitation hardening alloy, heat treatments during forming and production need to be closely controlled to limit any loss of strength due to changes in the microstructure. A new testing method in the closed-die forming was successfully employed to experimentally obtain the material behavior in a biaxial tension mode. A hot gas bulge test was used to perform interrupted steps for determining the stress-strain curve in elevated temperature conditions. Images were obtained in increments, and the ARAMIS strain-mapping system based on the digital image correlation (DIC) method was used to calculate the strain measurement.

Author Information

Bruhis, Moisei
Metal Forming Laboratory, Centre for Automotive Materials and Corrosion, McMaster Automotive Resource Centre (MARC), McMaster University, Hamilton, ON, CA
Partovi, Amir
Dept. of Mechanical Engineering, McMaster University, Hamilton, ON, CA
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Details
Pages: 55–66
DOI: 10.1520/STP163820210024
ISBN-EB: 978-0-8031-7724-6
ISBN-13: 978-0-8031-7723-9