Numerical models for buckling, postbuckling and failure analysis of pre-damaged thin-walled composite struts subjected to uniform compression. (June 2019)

• Record Type: Journal Article
• Authors: Debski, H.; Rozylo, P.; Gliszczynski, A.; Kubiak, T.
• Is Part Of: Thin-walled structures. Volume 139(2019)
• Page Start: 53
• Page End: 65
• Publication Date: 2019-06
• Subjects: Thin-walled struts -- FEM analysis -- Buckling -- Damage -- Failure mechanism; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2019.02.030
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: The paper investigates the stability and post-buckling states of compressed thin-walled composite struts with predamage as a result of low-velocity impact. The struts were made of a GFRP composite material with a symmetrical lay-up by the autoclave technique. The produced channel-section struts were subjected to 20 J impact in different areas of the structure: on the web and on the flange. The struts with composite damage were subjected to axial compression to investigate the effect of composite material damage on the stability and operation of the structure in the post-buckling range. A numerical analysis was performed by the finite element method to compare two models of composite material damage: the proposed Simplified Damage Model (SDM) and the model developed by Fardin Esrail and Christos Kassapoglou. The limit load when the structure loses its stability was determined by the progressive failure criterion, according to which damage initiation in the composite material is based on the Hashin criterion while damage evolution is described with the energy criterion. Highlights: Investigation of low velocity impact influence on stability and collapse of struts. Two damage models were used (SDM – own study and EKM) in FEM analysis. The numerical models were verified in experimental tests.