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G. Zhou, M. Hill, N. Hookham (2007)
Investigation of Parameters Governing the Damage and Energy Absorption Characteristics of Honeycomb Sandwich PanelsJournal of Sandwich Structures & Materials, 9
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Damage characteristics in sandwich panels subjected to static indentation using spherical indentors
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Impact Damage and Energy-absorbing Characteristics and Residual In-plane Compressive Strength of Honeycomb Sandwich PanelsJournal of Sandwich Structures & Materials, 11
G. Zhou, M. Hill, J. Loughlan, N. Hookham (2006)
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G. Chai, Shengqing Zhu (2011)
A review of low-velocity impact on sandwich structuresProceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials Design and Applications, 225
PurposeThe indentation behaviour of sandwich panels is significant to incipient damage and is known to be affected by a number of dominant parameters. However, it is challenging not only to demonstrate how those few dominant parameters influence the indentation behaviour but also to ascertain that such influence was coupled to the variation of the other dominant parameters. The paper aims to discuss these issues.Design/methodology/approachIn this work, the authors adopted a controllable quasi-static testing to carry out a diagnostic interrogation on the nature of incipient damage in laminate-skinned sandwich panels using hemispherical indenter and used photographs taken from the cross-sections of all the cut-up tested specimens, which were stopped both just before and after the initial critical loads, respectively, to confirm the mechanism of the incipient damage. Sandwich panels with aluminium honeycomb core had carbon/epoxy skins of two different thicknesses and lay-ups and hemispherical nosed indenter had three different diameters.FindingsThe authors found that: the incipient damage mechanism in all the panels was combined delamination in the skin and core crushing without debonding; doubling the skin thickness had the significant enhancement on critical load and indentation and this enhancement became greater for the larger indenter diameters; the indenter diameter had the moderate effect on critical load in the thick panels from 8 to 14 mm but had the negligible effect on thin panels and no effect on the thick panels from 14 to 20 mm; varying the skin lay-up or support had little effect on the indentation behaviour.Research limitations/implicationsThese findings were limited to the constant core density and core thickness. Varying the former significantly could alter the findings accordingly.Practical implicationsThe results of this work should be tremendously useful to design and analysis in industrial applications of sandwich structures in aircraft, vehicles, marine vessels and transport carriages for situations involving localised loading and deformation.Originality/valueThe results of this research work is one of the very few that demonstrated a systematic understanding of the indentation behaviour characteristics of sandwich construction, which is vital to the establishment of indentation law for sandwich structures in future.
International Journal of Structural Integrity – Emerald Publishing
Published: Aug 14, 2017
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