53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference<BR&amp;gt;20th AIAA/ASME/AHS Adapti 2012
DOI: 10.2514/6.2012-1702
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Functionally Grading Honeycomb Core Material by Inplane Crushing for Tapered Sandwich Closures

Abstract: Sandwich laminates are often ramped down to a solid composite laminate at the ends to enable the use of mechanical fasteners to connect them to support structures. The rampdown regions are often the site of fatigue damage initiation and delamination failure. Functionally grading sandwich core material in the rampdown closure region of a sandwich panel can mitigate the large shear stresses induced by stiffness and geometry changes, and the mismatch in facesheet and core stiffness properties. However, in practic… Show more

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Cited by 4 publications
(2 citation statements)
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“…Optimum choice might be to increase out-of-plane and shear modulus and decrease in-plane modulus. Stromsoe and Venkataraman [15] simulated densification of a honeycomb by sequential rolling along the edge before machining the tapering. They proposed convenient combination of roller diameters and depth of each rolling.…”
Section: Review Of Literaturementioning
confidence: 99%
“…Optimum choice might be to increase out-of-plane and shear modulus and decrease in-plane modulus. Stromsoe and Venkataraman [15] simulated densification of a honeycomb by sequential rolling along the edge before machining the tapering. They proposed convenient combination of roller diameters and depth of each rolling.…”
Section: Review Of Literaturementioning
confidence: 99%
“…Paris 16 performed tests on composite sandwich ramps with a 20°tapering angle under tensile loading, and the effect of core tip radius and core ramp reinforcing configurations (wrapped glass fabric, noodles, and potted foam) on failure loads was investigated. Numerical and experimental research by Wagschal, Stromsoe, Venkataraman et al [17][18][19] demonstrated that the use of functionally graded cores at tapered sandwich closeout regions mitigated large deformation and stress gradients and increased failure loads. The functionally graded densified core material was developed by in-plane crushing of regular periodic honeycomb cores.…”
Section: Introductionmentioning
confidence: 99%