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Residual stresses in sandwich components
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

High residual stresses are likely to develop in honeycomb sandwichparts after autoclave co-curing and can lead to manufacturing defects.By using finite element unit cell models, these stresses have been calculatedfor standard panels and for panels where different core blocksare joined with adhesive. Failure criteria are given for three types ofaluminum honeycombs under combined thermal and shear loads, allowingto calculate the residual strength of the cores. Residual stressvalues are also calculated for adhesive joints between different coreblocks, they being about the same order of magnitude as the strengthof the adhesive regardless of geometry or core combination. Last, it isshown that the effect of the sandwich plate chamfered edges in preventingthe core expansion during the heating cycle may cause corecrushing when high and low density honeycombs are combined.

Place, publisher, year, edition, pages
2012. , 47 p.
Trita-AVE, ISSN 1651-7660 ; 2012:91
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-121312OAI: diva2:618236
Available from: 2013-04-26 Created: 2013-04-26 Last updated: 2013-04-26Bibliographically approved

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