Response of thin-skinned sandwich panels to contact loading with flat-ended cylindrical punches: experiments, numerical simulations and neutron diffraction measurements

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dc.contributor.authorSaleh, Men_AU
dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorToppler, Ken_AU
dc.contributor.authorKabir, Ken_AU
dc.date.accessioned2017-03-27T05:07:38Zen_AU
dc.date.available2017-03-27T05:07:38Zen_AU
dc.date.issued2015-09-01en_AU
dc.date.statistics2017-03-07en_AU
dc.description.abstractThe response of aluminium foam-cored sandwich panels to localised contact loading was investigated experimentally and numerically using flat-ended cylindrical punch of four varying sizes. ALPORAS and ALULIGHT closed-cell foams of 15 mm thickness with 0.3 mm thick aluminium face sheets (of 236 MPa yield strength) were used to manufacture the sandwich panels. Face sheet fracturing at the perimeter of the indenter, in addition to foam cells collapse beneath the indenter and tearing of the cell walls at the perimeter of the indenter were the major failure mechanisms of the sandwich panels, irrespective of the strength and density of the underlying foam core. The authors employed a 3D model in ABAQUS/Explicit to evaluate the indentation event, the skin failure of the face sheets and carry out a sensitivity study of the panel's response. Using the foam model of Deshpande and Fleck combined with the forming limit diagram (FLD) of the aluminium face sheet, good quantitative and qualitative correlations between experiments and simulations were achieved. The higher plastic compliance of the ALPORAS led to increased bending of the sheet metal and delayed the onset of sheet necking and failure. ALULIGHT-cored panels exhibited higher load bearing and energy absorption capacity, compared with ALPORAS cores, due to their higher foam and cell densities and higher yield strength of the cell walls. Additionally, they exhibited greater propensity for strain hardening as evidenced by mechanical testing and the neutron diffraction measurements, which demonstrated the development of macroscopically measurable stresses at higher strains. At these conditions the ALULIGHT response upon compaction becomes akin to the response of bulk material with measurable elastic modulus and evident Poisson effect. Copyright © 2017 Elsevier B.V.en_AU
dc.identifier.citationSaleh, M., Luzin, V., Toppler, K., & Kabir, Kaveh. (2015). Response of thin-skinned sandwich panels to contact loading with flat-ended cylindrical punches: experiments, numerical simulations and neutron diffraction measurements. Composites Part B: Engineering, 78, 415-430. doi:10.1016/j.compositesb.2015.04.001en_AU
dc.identifier.govdoc7992en_AU
dc.identifier.issnhttp://dx.doi.org/10.1016/j.compositesb.2015.04.001en_AU
dc.identifier.journaltitleComposites Part B: Engineeringen_AU
dc.identifier.pagination415-430en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.compositesb.2015.04.001en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8501en_AU
dc.identifier.volume78en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectMechanical propertiesen_AU
dc.subjectFinite element methoden_AU
dc.subjectMechanical testsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectAluminiumen_AU
dc.subjectFracturingen_AU
dc.titleResponse of thin-skinned sandwich panels to contact loading with flat-ended cylindrical punches: experiments, numerical simulations and neutron diffraction measurementsen_AU
dc.typeJournal Articleen_AU
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