Date of Award

2014

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

First Advisor

Green, Daniel E.

Keywords

Applied sciences, Electrohydraulic forming, Experiments, Formability, High strain-rate, Numerical model

Rights

CC BY-NC-ND 4.0

Abstract

Electrohydraulic forming is a pulsed metal forming process that uses the discharge of electrical energy across a pair of electrodes submerged in fluid to form sheet metal. Pulsed metal forming processes, including electrohydraulic forming, have been shown to increase the formability of sheet metals, which is of significant industrial interest. An experimental procedure was developed to quantify the formability in electrohydraulic free forming (EHFF) that is consistent with the quasi-static formability assessment convention. Novel sheet metal specimen geometries were created to quantify the formability across the entire minor strain spectrum. The experimental EHFF forming limit curve (FLC) was determined for both AA5182-O and DP600 sheets. Compared to their respective quasi static FLCs, DP600 shows no formability improvement in EHFF while AA5182-O shows formability improvement over the entire range of minor strains including an 11% engineering strain improvement at the plane strain intercept. Numerical modeling indicated that peak strain rates reach approximately 2500 to10,000 s-1 .

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