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Dislocation density based constitutive model for ultrasonic assisted deformation

Prabhakar, Abhishek and Verma, Girish Chandra and Hariharan, Krishnasamy and Pandey, Pulak Mohan and Lee, Myoung Gyu and Suwas, Satyam (2017) Dislocation density based constitutive model for ultrasonic assisted deformation. In: MECHANICS RESEARCH COMMUNICATIONS, 85 . pp. 76-80.

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Official URL: http://doi.org/10.1016/j.mechrescom.2017.08.003


The mechanical-behaviour of metallic materials subjected to plastic deformation is altered with the superposition of ultrasonic vibrations. A significant effect is the reduction of flow stress or acoustic softening. This phenomenon is utilized in metal forming and other deformation based manufacturing processes. Experimental investigations on ultrasonic assisted tensile tests focus on the effect of ultrasonic vibrations along the longitudinal axis of the specimen, whereas the manufacturing processes employs in transverse directions. In the present work, transverse ultrasonic vibrations are imposed during a uniaxial tensile test using an aluminium alloy. The trend of acoustic softening due to transverse direction vibrations is similar to that along longitudinal direction. A dislocation density based constitutive model is extended to model the softening due to ultrasonic effect. The predicted results agree well with the experimental observations. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 11 Nov 2017 06:59
Last Modified: 11 Nov 2017 06:59
URI: http://eprints.iisc.ac.in/id/eprint/58212

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