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Publikācija: Experimental Evaluation of Damage Influence on Buckling Performance of Stiffened CFRP Shells

Publication Type Publications in RTU scientific journal
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Experimental Evaluation of Damage Influence on Buckling Performance of Stiffened CFRP Shells
Field of research 2. Engineering and technology
Sub-field of research 2.4 Chemical engineering
Authors Olģerts Ozoliņš
Kārlis Dzelzītis
Edgars Eglītis
Keywords buckling, post-buckling, delamination, non-destructive inspections
Abstract Delamination type failures are often observed in carbon-epoxy composites, where catastrophic failure is generally preceded by constituent level damage accumulation. Out-of-plane loading such as internal pressure in a composite fuselage or out-of-plane deformations in compression-loaded post-buckled panel may lead to debonding of the frame or stiffener from the panel. On other hand, numerous investigations show the ability of stiffened composite structures to work in the post-buckling region, which is considered unsafe in the conventional design procedures. Experimental evaluation of damage influence on post-buckling performance of stiffened shells is essential for development of safe design guidelines that would allow exploitation of these structures in the post-buckling region. The results of this investigation show that a damaged stiffened composite shell can be loaded up to 200% of skin buckling load without any propagation of delaminations. This can serve as the base for more extended studies on the subject, including numerical modelling and improvement of the existing design guidelines.
Reference Ozoliņš, O., Dzelzītis, K., Eglītis, E. Experimental Evaluation of Damage Influence on Buckling Performance of Stiffened CFRP Shells. Construction Science. Vol.10, 2009, pp.79-92. ISSN 1407-7329.
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ID 6835