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Comparative analysis of drills for composite laminates
Luís Miguel P. Durão; Daniel J. S. Gonçalves; João Manuel R. S. Tavares; Victor Hugo C. de Albuquerque; A. Torres MarquesThe characteristics of carbon fiber-reinforced plastics allow a very broad range of uses. Drilling is often necessary to assemble different components, but this can lead to various forms of damage, such as delamination which is the most severe. However, a reduced thrust force can decrease the risk of delamination. In this work, two variables of the drilling process were compared: tool material and geometry, as ...
Drilling of carbon fibre reinforced laminates – a comparative analysis of...
Luís M.P. Durão; Daniel J. S. Gonçalves; João Manuel R. S. Tavares; Victor Hugo C. Albuquerque; A. Torres Marques; A. M. BaptistaThe distinguishing characteristics of carbon fibre reinforced laminates, like low weight, high strength or stiffness, had resulted in the increase of their use during the last decades. Although parts are normally produced to "near-net" shape, machining operations like drilling are still needed. In result of composites non-homogeneity, this operation can lead to delamination, considered the most serious kind of ...
Evaluation of Tools and Cutting Conditions on Carbon Fibre Reinforced Laminates
Daniel J. S. Gonçalves; Luís Miguel P. Durão; João Manuel R. S. Tavares; Victor Hugo Costa de Albuquerque; A. Torres MarquesThe distinctive characteristics of carbon fibre reinforced plastics, like low weight or high specific strength, had broadened their use to new fields. Due to the need of assembly to structures, machining operations like drilling are frequent. In result of composites inhomogeneity, this operation can lead to different damages that reduce mechanical strength of the parts in the connection area. From these damages...
Drilling of carbon fibre reinforced laminates : a study
Luís M. P. Durão; Daniel J. S. Gonçalves; João Manuel R. S. Tavares; Victor H. C. Albuquerque; A. Torres Marques; A. M. BaptistaThe distinguishing characteristics of carbon fibre reinforced laminates, like low weight, high strength or stiffness, had resulted in an increase of their use during the last decades. Although parts are normally produced to "near-net" shape, machining operations like drilling are still needed. In result of composites non-homogeneity, this operation can lead to delamination, considered the most serious kind of d...
Analyzing objects in images for estimating the delamination influence on load c...
Luís Miguel Durão; António G. Magalhães; João Manuel R. S. Tavares; A. Torres MarquesThe use of fiber reinforced plastics has increased in the last decades due to their unique properties. Advantages of their use are related with low weight, high strength and stiffness. Drilling of composite plates can be carried out in conventional machinery with some adaptations. However, the presence of typical defects like delamination can affect mechanical properties of produced parts. In this paper delamin...
Estudo da Influência da Pré-Furação no Dano em Laminados Carbono/Epóxido
L. M. Pereira Durão; João Manuel R. S. Tavares; A. Torres Marques; A. Gonçalves Magalhães; M. FreitasNa furação de placas em materiais compósitos é corrente o uso de técnicas tradicionais de furação adaptadas. O defeito mais grave é a delaminação, que nem sempre é visível à superfície e pode causar o colapso prematuro das estruturas. Para a avaliação dos danos provocados nas peças utilizam-se meios de controlo não-destrutivo. Neste artigo são analisados os resultados obtidos através do recurso à pré-furação em...
Delamination analysis after carbon/epoxy plate drilling
L. M. P. Durão; A. G. Magalhães; João Manuel R. S. Tavares; A. Torres MarquesDrilling of carbon fibre reinforced plates – CFRP – causes typical damages such as delamination and others. These damages, that cannot be visually detected, can cause the premature collapse of structures. Damage assessment is usually carried out using non-destructive inspections like radiography and ultrasonic C-scan. Damage extent can be evaluated by the use of damage criteria. One of them – ...
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