Flexural testing on carbon fibre laminates taking into account their different behaviour under tension and compression

37th Risø International Symposium on Materials Science

Moreno, M.C. Serna^1 ; Gutiérrez, A. Romero^1 ; Vicente, J.L. Martínez^1

Universidad de Castilla-La Mancha, Instituto Investigaciones Energéticas y Aplicaciones Industriales, ETS Ingenieros Industriales, Av. Camilo José Cela s/n, Ciudad Real

13071, Spain^1

关键词: Analytical estimations;    Carbon fibre laminates;    Carbon fibre reinforced polymer;    Critical applications;    Damage initiation and evolution;    Out-of-plane shear loads;    Tension and compression;    Three-point bending test;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/139/1/012047/pdf
DOI  :  10.1088/1757-899X/139/1/012047

来源: IOP

【 摘 要 】

An analytical model has been derived for describing the results of three-point-bending tests in materials with different behaviour under tension and compression. The shift of the neutral plane and the damage initiation mode and its location have been defined. The validity of the equations has been reviewed by testing carbon fibre-reinforced polymers (CFRP), typically employed in different weight-critical applications. Both unidirectional and cross-ply laminates have been studied. The initial failure mode produced depends directly on the beam span- thickness relation. Therefore, specimens with different thicknesses have been analysed for examining the damage initiation due to either the bending moment or the out-of-plane shear load. The experimental description of the damage initiation and evolution has been shown by means of optical microscopy. The good agreement between the analytical estimations and the experimental results shows the validity of the analytical model exposed.