Date of Award

2-17-2016

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

First Advisor

Riahi, Reza

Keywords

aluminum alloys, plastic deformation, tensile testing, ultrasonic

Rights

CC BY-NC-ND 4.0

Abstract

Ultrasonic tension (with a frequency of 20 kHz and maximum output of 700W) test were performed on AA6061, AA5086, AA1100, Brass 260 and Copper 110. By comparing with simple tension test results, the ultimate tensile strength is reduced and it is found that the acoustic softening effect has influenced on formability and tensile toughness of materials. Longitudinal and transversal ultrasonic vibration has been induced to study the effect of ultrasound on the metal forming process, the two kinds of ultrasonic vibration have significant yet different effects on tensile behavior of metals in reducing the flow stress of materials and can be concluded into two different aspects: Under the application of transversal ultrasonic vibration, elongation reduces with small softening effect; When a longitudinal ultrasonic vibration is applied, the softening effect dominates and improves the strain of metals.

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