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Pull-off tests of CFRP T-joints with conventional and 3D reinforced fillets
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-5612-6839
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-9207-3404
2019 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 223Article in journal (Refereed) Published
Abstract [en]

A study of T-joints made of CFRP prepreg is presented where the joints contain either conventional uni-directional (UD) fillets or fillets with three-dimensional (3D) woven reinforcement in the joint cavity. Both pristine and impacted specimens are tested experimentally in a pull-off load case. The T-joints with UD fillets are stronger but also show greater spread in strength than T-joints with 3D fillets. The higher strength is attributed to the UD fillets' ability to deform transversely to their length direction and efficiently adapt to the T-joint cavity before curing. The 3D fillets do not admit the same level of transverse shape adaptability and if their cross sections do not fit the geometry of the T-joint cavity sufficiently well, local stress concentrations could emerge that reduce the strength of the T-joint. The UD fillets on the other hand are believed to be sensitive to manufacturing flaws causing the greater spread in strength. That in turn is attributed to a lack of crack-arresting capability in the UD fillet. The 3D fillets however have excellent crack-arresting properties due to their multidirectional fibre architecture. With a few exceptions the impact damages did not significantly affect the strength of the T-joints tested in this study.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 223
Keywords [en]
3D weave, 3D textile, Damage tolerance, Impact damage, Thermal contraction, Residual stress
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-255398DOI: 10.1016/j.compstruct.2019.110893ISI: 000473320600029Scopus ID: 2-s2.0-85065800924OAI: oai:DiVA.org:kth-255398DiVA, id: diva2:1342828
Note

QC 20190814

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved

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Hallström, Stefan

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