Source: http://www.proceedings.blucher.com.br/article-details/damage-in-fibre-reinforced-laminates-under-dynamic-loading-8998
Timestamp: 2019-04-22 00:20:00+00:00

Document:
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.
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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, 2014.
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