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The International Journal of Advanced Manufacturing Technology

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08-06-2021 | ORIGINAL ARTICLE

Ultrasonic vibration-induced severe plastic deformation of Cu foils: effects of elastic-plastic stress wave bounce, acoustic softening, and size effect

Authors: Zhihao Chen, Chao Liu, Ekta Rani, Harishchandra Singh, Marko Huttula, Jukka Kömi, Wei Cao

Published in: The International Journal of Advanced Manufacturing Technology | Issue 11-12/2021

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Abstract

In this work, the unique plastic deformation behavior of T2 rolled copper foils under ultrasonic impact (UI) and ultrasonic rolling (UR) has been studied systematically. The numerical simulation and test results show that with the decrease of the thickness of copper sheet, the equivalent plastic strain (PEEQ) value and plastic strain ε_p formed by UI or UR increase exponentially, and its distribution changes from gradient to uniform on the cross section, which is distinctive from the commonly observed gradient structure in ultrasonically treated bulk materials. Correspondingly, characterized by EBSD and TEM, the 100-μm-thick copper foil treated by UR shows the overall strengthening and forming a sub-micron grain structure with significant refinement and uniform distribution on the cross section. The microstructure homogenization of copper foil is attributed to the rigid wall effect facilitating the elastic-plastic stress wave bounce. The exponential increase of PEEQ and ε_p is explained as that with the decrease of the thickness of ultrasonic object, on the one hand, the acoustic softening and size effect which can reduce the elastic limit of copper foil are enhanced; on the other hand, the plastic deformation mode changes from stress superposition to dynamic impact. Through the establishment of a new theoretical model, the criterion of ultrasonic dynamic impact effect is deduced and verified by experiments.

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Title: Ultrasonic vibration-induced severe plastic deformation of Cu foils: effects of elastic-plastic stress wave bounce, acoustic softening, and size effect
Authors: Zhihao Chen
Chao Liu
Ekta Rani
Harishchandra Singh
Marko Huttula
Jukka Kömi
Wei Cao
Publication date: 08-06-2021
Publisher: Springer London
Published in: The International Journal of Advanced Manufacturing Technology / Issue 11-12/2021
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI: https://doi.org/10.1007/s00170-021-07390-y

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