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Technical Briefs

Characterization of Tensile and Compressive Behavior of Microscale Sheet Metals Using a Transparent Microwedge Device

[+] Author and Article Information
James Magargee, Rui Zhou, Morgan McHugh

 Northwestern University, Department of Mechanical Engineering, Evanston, IL, 60208

Jian Cao1

 Northwestern University, Department of Mechanical Engineering, Evanston, IL, 60208

Damon Brink

IntriMed Technologies, Oxnard, CA 93030

Fabrice Morestin

INSA de Lyon, Lyon, 69621 France

1

Corresponding author.

J. Manuf. Sci. Eng 133(6), 064501 (Dec 21, 2011) (4 pages) doi:10.1115/1.4005401 History: Received April 01, 2011; Revised September 19, 2011; Published December 21, 2011; Online December 21, 2011

The cyclic and compressive mechanical behavior of ultrathin sheet metals was experimentally investigated. A novel transparent wedge device was designed and fabricated to prevent the buckling of thin sheets under compressive loads, while also allowing full field strain measurements of the specimen using digital imaging methods. Thin brass and stainless steel sheet metal specimens with thicknesses on the order of 10–100 μm were tested using the microwedge device. Experimental results show that the device can be used to delay the onset of early buckling modes of a thin sheet under compression, which is critical in examining the compressive and cyclic mechanical behavior of sheet metals.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Microwedge device for cyclic testing

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Figure 2

Tensile specimen geometry (all units in mm)

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Figure 3

Mini-uniaxial testing machine

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Figure 4

Tensile specimen inside the microwedge device

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Figure 8

Critical buckling load model and prediction compared to. experimentally observed buckling load

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Figure 7

Specimen buckling after reaching maximum compressive load

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Figure 6

Tension/compression test of 260 series brass

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Figure 5

Friction force as a function of displacement for microwedge device

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