Numerical analysis of the laminate-metal bolted joint
Agnieszka Derewońko, Roman Gieleta, Krzysztof Kosiuczenko Wojskowa Akademia Techniczna, Katedra Mechaniki i Informatyki Stosowanej, ul. gen. Kaliskiego 2, 00-908 Warszawa, Poland
Quarterly No. 2, 2008 pages 185-189
DOI:
keywords: FEM, composite, bolted joint
abstract In the construction of bolted/riveted joints of laminar composites with metal, the forces of adhesion (bonding), cohesion and friction (screwed joints) are utilised. Such joints eliminate the phenomena of electrochemical corrosion, and assure the state of stress advantageous from the point of the view of the joint carrying capacities. Investigations of deformations in screw holes or rivets are more difficult. The existing methods change the conditions of interaction of the pieces or are limited only to specific materials. The use of numerical methods makes possible the determination of the strains and stresses states present in these areas, particularly in the case of such materials as composites. However, the numerical analysis of composite materials requires the use of special computational procedures adapted to their specificities. The finite elements with special properties are necessary to create the composite model. The paper presents the numerical analysis of a bonded joint of steel with a carbon-epoxy composite. The introduced joint was strengthened with a screw. The thin ply of epoxy glue joining the individual pieces was considered in the calculations. The use of special procedures to represent the contact model allowed to hold the discontinuity of the stress field the interfaces of the jointed pieces. Two numerical models were considered in the paper: one without regard of the screw in the hole and the other - with the screw. The received results confirm the phenomena observed in real hybrid steel-composites joints.