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Drilling delamination outcomes on glass and sisal reinforced plastics
Luís Miguel P. Durão; Daniel J.S. Gonçalves; João Manuel R. S. Tavares; Victor Hugo C. de Albuquerque; Túlio H. Panzera; Leandro J. Silva; A.A. VieiraNowadays, fibre reinforced plastics are used in a wide variety of applications. Apart from the most known reinforcement fibres, like glass or carbon, natural fibres can be seen as an economical alternative. However, some mistrust is yet limiting the use of such materials, being one of the main reasons the inconsistency normally found in their mechanical properties. It should be noticed that these materials are ...
Avaliação de ferramentas na furação de laminados compósitos
D. J. S. Goncalves; L. M. P. Durão; V.H.C. de Albuquerque; J.M.R.S. Tavares; A. M. BaptistaThe development of cutting tools becomes a challenge to the industry of composite materials to obtain high quality holes, minimizing damage. This work aims to examine the influence of various parameters such as feed rate and tool geometry on thrust forces developed during drilling operations and on the extent of damage. In this work, a comparative study of tool geometry with the aim of reducing the associated d...
Drilling delamination outcomes on glass and sisal reinforced plastics
L.M. Durão; Daniel J.S. Gonçalves; João Manuel R. S.Tavares; Victor H.C. de Albuquerque; Túlio H. Panzera; Leandro J. Silva; A.A. Vieira; A. M. BaptistaNowadays, fibre reinforced plastics are used in a wide variety of applications. Apart from the most known reinforcement fibres, like glass or carbon, natural fibres can be seen as an economical alternative. However, some mistrust is yet limiting the use of such materials, being one of the main reasons the inconsistency normally found in their mechanical properties. It should be noticed that these materials are ...
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 ...
Nutrient release by a Brazilian sedimentary zeolite
Monte,Marisa B.M.; Middea,Antonieta; Paiva,Paulo R.P.; Bernardi,Alberto C.C.; Rezende,Nélio G.A.M.; Baptista-Filho,Milton; Silva,Marcelo G.This report describes the characterization of a sedimentary occurrence from the Parnaíba Basin, Brazil, containing the zeolite stilbite intertwined with smectitic clay mineral. The head samples from different sites present a wide content range of the zeolitic phase - 15% to 50%. The use of simple separation techniques - conventional gravitic treatments - yields concentrates containing about 67% of the zeolitic ...
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...
Comparison of Different Cemented Tungsten Carbides Applied to Particle-Board Ma...
F. Jorge Lino; João Guimarães; Luís Teixeira; A. M. Baptista; Tiago Fernandes; Fernando FigueiredoNowadays, many industrial companies have already established procedures to incorporate recycled products in their production lines. According to recent statistics, the wood recycling is growing exponentially, with products like MDF (medium density fiberboard), OSB (oriented strand board) or Particleboards being more and more important in the wood/furniture industry. Many times these products have different type...
Refractory severe ulcerative colitis. Experience with cyclosporine.
Canena, J; Serviço de Medicina Interna e Gastrenterologia, Faculdade de Ciências Médicas, Universidade Nova, Lisboa.; Leitão, J; Turpin, S; Penedo, JA case of severe ulcerative colitis refractory to steroid therapy is reported. The authors look at cyclosporine use in this clinical setting and make a short review of cyclosporine usefulness and major side effects. ; A case of severe ulcerative colitis refractory to steroid therapy is reported. The authors look at cyclosporine use in this clinical setting and make a short review of cyclosporine usefulness and...
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