Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics
Full Article - Open Access.
DAMAGE IN FIBRE-REINFORCED LAMINATES UNDER DYNAMIC LOADING
Fibre-reinforced polymers (FRPs) became one of the most important structural materials in various industries due to their unique combination of properties such as excellent stiffness, high strength-to-weight ratio, and ease to manufacture shapes tailored for applications. Hence, they are now broadly used in aerospace and naval structures as well as in automotive, construction and energy industry; there is an increasing use of them in sports products. In service, components and structures, containing composites, can be exposed to different loading conditions including dynamic events, e.g. impacts. Such loads can cause deterioration of their structural integrity and load-bearing capacity due to induced damage. Because of their heterogeneity and microstructure, composite laminates usually demonstrate multiple modes of damage and fracture if compared with more traditional, macroscopically homogeneous, structural materials such as metals and alloys. This study deals with analysis of damage in two types of fibre-reinforced polymers - cross-ply and woven laminates - under impact loading. The first type of FRP is exposed to conditions of impact fatigue (IF). IF can be defined as a repetition of low-energy impacts with energy amplitudes insufficient to cause a total failure of a component in a single impact. Another type of laminate – reinforced with 2/2 twill fabric – was loaded in various modes. The properties of, and damage evolution in, the studied two types of laminates were analysed using a combination of mechanical testing and microstructural and damage studies using optical microscopy and X-ray micro computed tomography. Dynamic mechanical tests on cross-ply laminates were implemented using a uni-axial tensile impact loading. Advanced FE models were developed in Abaqus/Explicit to characterise the response of FRP laminates to impact loading conditions in order to elucidate their dynamical mechanical behaviour. A 3d finite-element model for uni-axial tensional impact loading of tested samples of FRP cross-ply laminates was developed with a hammer-specimen interaction simulated directly to obtain detailed information about impact conditions. The obtained results are compared with experimental data.
Palavras-chave: FRP, dynamic loading, impact, damage,
-  Ernst G., Vogler M., Hühne C., Rolfes R., “Multiscale progressive failure analysis of textile composites”. Compos. Sci. Technol.. 70(1), 61-72, 2010.
-  Menna C., Asprone D., Caprino G., Lopresto V., Prota A., “Numerical simulation of impact tests on GFRP composite laminates”. Int. J. Impact Eng.. 38(8–9), 677-85, 2011.
-  Casas-Rodriguez J., Ashcroft I. A., Silberschmidt V. V., “Damage in adhesively bonded CFRP joints: Sinusoidal and impact-fatigue”. Compos. Sci. Technol.. 68(13), 2663-70, 2008.
-  Casas-Rodriguez J., Ashcroft I. A., Silberschmidt V. V., “Delamination in adhesively bonded CFRP joints: Standard fatigue, impact-fatigue and intermittent impact”. Compos. Sci. Technol.. 68(12), 2401-9, 2008.
-  Abrate S. “Modeling of impacts on composite structures”. Compos. Structures. 51(2), 129-38 2001.
-  Naik N., Chandra Sekher Y., Meduri S., “Damage in woven-fabric composites subjected to low-velocity impact”. Compos. Sci. Technol.. 60(5), 731-44, 2000.
-  Johnson A., Pickett A., Rozycki P., “Computational methods for predicting impact damage in composite structures”. Compos. Sci. Technol. 61(15), 2183-92, 2001
-  Iannucci L., Willows M., “An energy based damage mechanics approach to modelling impact onto woven composite materials--Part I: Numerical models”. Compos. A 37(11), 2041-56, 2006.
-  Reyes G., Sharma U., “Modeling and damage repair of woven thermoplastic composites subjected to low velocity impact. Compos. Structures. 92(2), :523-31, 2010.
-  Ullah H., Harland A. R., Lucas T., Price D., Silberschmidt V. V., “Finite-element modelling of bending of CFRP laminates: Multiple delaminations”. Comput. Mater. Sci.. 52(1):147-56, 2012.
-  Ullah H., Harland A. R., Lucas T., Price D., Silberschmidt V. V., “Analysis of nonlinear deformations and damage in CFRP textile laminates”. J. Phys.: Conf. Ser. 305, 12045, 20
-  Ullah H., Harland A. R., Blenkinsopp R., Lucas T., Price D., Silberschmidt V. V., “Analysis of nonlinear shear deformations in CFRP and GFRP textile laminates”. Appl. Mech. Mater. 70, 363-8, 2011.
-  Silberschmidt V. V. , Casas-Rodriguez J. P., Ashcroft I. A., “Impact fatigue of adhesive joints”. Key Eng. Mater. 399, 71-8, 2009.
-  Daggumati S., Voet E., Van Paepegem W., Degrieck J., Xu J., Lomov S. V., et al. “Local strain in a 5-harness satin weave composite under static tension: Part I - Experimental analysis”.Compos. Sci. Technol. . 70, 1926-33, 2010.
-  Turon A., Davila C. G., Camanho P. P., Costa J., “An engineering solution for mesh size effects in the simulation of delamination using cohesive zone models”. Eng Fracture Mech.. 74(10), 1665-82, 2007.
-  Ullah H., Harland A. R. , Silberschmidt V. V., “Experimental and numerical analysis of damage in woven GFRP composites under large-deflection bending”. Appl. Compos. Mater. DOI: 10.1007/s10443-011-9242-7.
-  Benzeggagh M. L., Kenane M., “Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixed-mode bending apparatus”. Compos. Sci. Technol.. 56(4), 439-49, 1996.
-  Daudeville L., Allix O., Ladeveze P., “Delamination analysis by damage mechanics: some applications”. Compos. Eng.. 5(1), 17-24, 1995.
Ullah, H.; Tsigkourakos, G.; Vartzopoulos, F.; Ashcroft, I.A.; Silberschmidt, V.V.; "DAMAGE IN FIBRE-REINFORCED LAMINATES UNDER DYNAMIC LOADING", p. 89-104 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1].
São Paulo: Blucher,
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-16649
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