Paper number 541

MATRIX CRACKING IN A (0/90)2S GFRP LAMINATE LOADED IN FLEXURE

P.A.Smith, S.L.Ogin and G.Faulks

School of Mechanical and Materials Engineering
University of Surrey, Guildford, Surrey, GU2 5XH, UK

Summary Matrix cracking in a (0/90)2s GFRP laminate loaded in four point bending has been studied experimentally and analytically. Experimental data have been obtained for crack accumulation in the single 90 ply near the tensile face of the laminate as functions of applied bending moment and in situ ply strain. The cracks lead to a reduction in the flexural stiffness of the laminate while the partial release of thermal stress associated with crack formation leads to a residual curvature on unloading. Results for crack onset and the residual properties as a function of damage are in reasonable agreement with a closed-form analytical model based on one-dimensional beam theory (with the cracked 90 ply properties degraded in accordance with a shear-lag model) in conjunction with fracture mechanics.
Keywords bending, transverse cracks, stiffness, fracture mechanics, cross-ply laminate, residual curvature.

Theme : Mechanical and Physical Properties ; Damage Mechanics

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