BONDED COMPOSITE REPAIRS UNDER DRY/COLD AND HOT/WET ENVIRONMENTAL CONDITIONS

Florian Röper, Christian Hannesschläger, Bernhard Plank, Markus Wolfahrt, G Kucher, Gerald Pinter

Research output: Chapter in Book/Report/Conference proceedingsConference contribution

Abstract

Composite structures are increasingly present in various types of structures, especially in the aircraft industry. As a result, suitable repair strategies have to be developed and tested. Hereby, an important part is testing under relevant environmental conditions. As a consequence, the current research work is focused on the influence of (1) testing at -30 °C in dried condition and (2) testing at 70 °C after 100 cycles between -30 °C and 70 °C / 85 % r. h. on the tensile strength of repair specimens. Specimens were repaired with 2 different taper ratios using a soft patch repair approach. Prior to tensile testing, the moisture absorption was assessed during conditioning at 70 °C / 85 % r. h. and during cyclic conditioning. For the cyclic conditioning, computed tomography (CT) was additionally performed in order to assess possible damage evolution between the dried and the conditioned state (after 100 cycles). Tensile testing showed a reduction in tensile strength in comparison to the non-repaired specimens for both taper ratios. The failure mode of the repair specimens changed from fiber failure to failure in the vicinity of the bondline with the steeper taper angle. CT images showed no indication of evolving defects in the vicinity of the bondline as a result of the cyclic conditioning.
Original languageEnglish
Title of host publicationProceedings of the 22nd International Conference on Composite Materials
Pages1-12
Publication statusPublished - 2019
Event22nd International Conference on Composite Materials - Melbourne, Australia
Duration: 11 Aug 201916 Aug 2019
https://iccm22.com/

Conference

Conference22nd International Conference on Composite Materials
CountryAustralia
CityMelbourne
Period11.08.201916.08.2019
Internet address

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