Buckling strength of adhesively-bonded single and double-strap repairs on carbon-epoxy structures

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Campilho, RDSG (Author) Other; de Moura, MFSF (Author) FEUP; Ramantani, DA (Author) Other; Morais, JJL (Author) Other; Domingues, JJMS (Author) Other

Journal

Title: Composites Science and Technology

Vol. 70

Pages: 371-379

ISSN: 0266-3538

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 31 Citations

ISI Web of Science

Scopus - 44 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-003-99R

DOI: 10.1016/j.compscitech.2009.11.010

Abstract (EN): This work reports on an experimental and finite element method (FEM) parametric study of adhesively-bonded single and double-strap repairs on carbon-epoxy structures under buckling unrestrained compression. The influence of the overlap length and patch thickness was evaluated. This loading gains a particular significance from the additional characteristic mechanisms of structures under compression, such as fibres microbuckling, for buckling restrained structures, or global buckling of the assembly, if no transverse restriction exists. The FEM analysis is based on the use of cohesive elements including mixed-mode criteria to simulate a cohesive fracture of the adhesive layer. Trapezoidal laws in pure modes I and II were used to account for the ductility of most structural adhesives. These laws were estimated for the adhesive used from double cantilever beam (DCB) and end-notched flexure (ENF) tests, respectively, using an inverse technique. The pure mode III cohesive law was equalled to the pure mode II one. Compression failure in the laminates was predicted using a stress-based criterion. The accurate FEM predictions open a good prospect for the reduction of the extensive experimentation in the design of carbon-epoxy repairs. Design principles were also established for these repairs under buckling.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9