Joining of FRP Sandwich and Steel
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
SP has recognized that there today exists a need to develop structures at sea since much can be done to reduce the weight of ships by using lightweight structures hence being able to construct ships with reduced need for fuel consumption or increased load capacity. A great area of interest is then fibre composites as a means to reduce weight.To be able to be involved in the work of developing new lighter constructions, new mathematical models and metrics is needed. One step in acquiring this higher competence is to study how joints between fibre composites and steel can be done in an effective and reliable manner. One application of such joints can be a steel hull with a composite superstructure.Tests have been made on joints between steel and a carbon fibre sandwich panel. The joints are of the type fork joint where a sandwich panel is bonded in to a steel profile with the shape of a two fingered fork using structural adhesive. The tested joints has been manufactured by Kockums AB shipyard in Karlskrona.The tests have been performed under compressive loads in combination with bending.To accommodate the tests a test rig has been built.For measuring the strains and displacements in the joints a non contact optical measurement system called ARAMIS has been used.The results show that the joints were very little affected by the applied design loads implying that they are either over dimensioned or needs to be tested with stronger equipment to test the joints behaviour closer to their yield point. To study how ageing will affect the joints, and how large safety margin is needed for the joints to still be functionalafter many years at sea, would however require further investigations. The use of the ARAMIS system helped in getting a good picture of where in the joints different displacements occurred. A simple 3D FE (Finite Element) model was created and used for comparing against the measurements. The FE model showed results where the strain distribution correspondedto the tests although the strain levels not being an exact match.
Place, publisher, year, edition, pages
2011. , 105 p.
Trita-AVE, ISSN 1651-7660 ; 2011:100
, SP rapport, ISSN 978-91-87017-17-9 ; 2011:84
Composite Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-78708OAI: oai:DiVA.org:kth-78708DiVA: diva2:492846
Subject / course
Master of Science in Engineering - Vehicle Engineering