Serration Phenomena of AA5182/Polypropylene/AA5182 Sandwich Sheets

Kee Joo Kim; Joo Sung Kim

doi:10.4028/www.scientific.net/KEM.326-328.417

Paper Titles

Design and Orthogonality Correction of a Planar Scanner for an Atomic Force Microscope
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Monitoring of Brittle-Ductile Transition during AFM Machining Using Acoustic Emission
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Surface Characterization of the Milled–Silicon Nitride Nano Powders by XPS and TEM
p.409

Computation of Fluid Film Pressures by Measuring the Elastohydrodynamic Lubrication Film Thickness with Nano-Scale Resolution
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Serration Phenomena of AA5182/Polypropylene/AA5182 Sandwich Sheets
p.417

Fabrication of the Fine Magnetic Abrasives by Using Mechanical Alloying Process and its Polishing Characteristics
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Nano Manufacturing Using Fountain Pen Nano-Lithography with Active Membrane Pumping
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Microstructural Characterization of Al-Zr Alloy with Nano-Sized Grains
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Influence of Ultrasound Power on the Formation of Submicron Etch Pits during Sonoelectrochemical Etching of Aluminum
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 326-328Serration Phenomena of AA5182/Polypropylene/AA5182...

Serration Phenomena of AA5182/Polypropylene/AA5182 Sandwich Sheets

Abstract:

It has been reported that the 5182 aluminum sheet shows Lüders band because of dissolved Mg atoms that cause fabrication process problem, especially surface roughness. The examination of serration phenomena has been made after the tensile deformation of the AA/PP/AA sandwich sheets as well as that of the 5182 aluminum. All sandwich sheets and the 5182 aluminum skin showed serration phenomena on their flow curves. However, the magnitude of serration was significantly diminished in the sandwich sheet with high volume fraction of the polypropylene core. According to the results of the analysis of the surface roughness after tensile test, Lüders band depth of the sandwich sheet evidently showed lower than that of the 5182 aluminum skin. The strain rate sensitivity, m-value, of the 5182 aluminum skin was -0.006. By attaching these skins to the polypropylene core, which has relatively large positive value of 0.050, m-value of the sandwich sheets changed to the positive value.