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Indexed by:期刊论文

Date of Publication:2014-11-01

Journal:THIN-WALLED STRUCTURES

Included Journals:SCIE、EI

Volume:84

Page Number:416-422

ISSN No.:0263-8231

Key Words:Carbon fibers; Honeycomb filled orthogrid; Sandwich structures; Mechanical properties; Scanning electron microscopy

Abstract:The full potential of carbon-fiber and aluminum-honeycomb sandwich panels and structures has been limited by the huge property mismatch between the high-stiffness carbon fiber and low-stiffness aluminum honeycomb. In this study, an orthogrid structure was added into the sandwich structure to raise the stiffness of soft honeycomb and therefore reduce the interfacial mismatch. The core then became an aluminum orthogrid structure filled with aluminum-honeycomb blocks. Three point bending tests were conducted to compare carbon fiber sandwiches with different types of core: (1) aluminum-honeycomb core; (2) aluminum-plate orthogrid core; and (3) aluminum-plate orthogrid core filled by aluminum-honeycomb blocks. The honeycomb filled orthogrid core sandwich was a bit heavier than the honeycomb or grid sandwich, but the critical load, specific strength and energy absorption ability were all improved. The results indicated that the honeycomb filled orthogrid core sandwich with carbon fiber face sheet could provide improved structural properties for thin walled engineering structures. (C) 2014 Elsevier Ltd. All rights reserved.