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Open AccessArticle

A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals

1
Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
2
Department of Mechanical Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan
3
Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, Moscow 119526, Russia
*
Author to whom correspondence should be addressed.
Metals 2019, 9(4), 451; https://doi.org/10.3390/met9040451
Received: 22 March 2019 / Revised: 14 April 2019 / Accepted: 16 April 2019 / Published: 17 April 2019
(This article belongs to the Special Issue Metal Micro-forming)
In sheet microforming processes, in-surface principal strain rates may be compressive such that the thickness of the sheet increases in the process of deformation. In general, the evolution of free surface roughness depends on the sense of the principal strain normal to the free surface. Therefore, in order to predict the evolution of free surface roughness in processes in which this normal principal strain is positive by means of empirical equations, it is necessary to carry out experiments in which the thickness of the sheet increases. Conventional experiments, such as the Marciniak test, do not provide such strain paths. In general, it is rather difficult to induce a sufficiently uniform state of strain in thin sheets of increasing thickness throughout the process of deformation because instability occurs at the very beginning of the process. The present paper proposes a compression test for thin sheets. Teflon sheets are placed between support jigs and the metallic sheet tested to prevent the occurrence of instability and significantly reduce the effect of the support jigs on the evolution of surface roughness. The test is used to determine the evolution of surface roughness in thin sheets made of C1220-O under three strain paths. View Full-Text
Keywords: free surface roughness evolution; compression; thin sheet metal; micro metal forming free surface roughness evolution; compression; thin sheet metal; micro metal forming
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MDPI and ACS Style

Furushima, T.; Aoto, K.; Alexandrov, S. A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals. Metals 2019, 9, 451.

AMA Style

Furushima T, Aoto K, Alexandrov S. A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals. Metals. 2019; 9(4):451.

Chicago/Turabian Style

Furushima, Tsuyoshi; Aoto, Kohei; Alexandrov, Sergei. 2019. "A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals" Metals 9, no. 4: 451.

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