Encontrados 21 documentos, a visualizar página 1 de 3
Fatigue life evaluation for carbon/epoxy laminate composites under constant and...
Reis, P. N. B.; Ferreira, J. A. M.; Costa, J. D. M.; Richardson, M. O. W.http://www.sciencedirect.com/science/article/B6TWT-4TN82M4-1/2/ffb1a17eaf7390463ad097c3ba5d4e8f
A study on the mechanical behaviour of WC/Co hardmetals
Ferreira, J. A. M.; Amaral, M. A. Pina; Antunes, F. V.; Costa, J. D. M.The hardmetal cutting tools used in machining are submitted to extreme conditions in terms of temperature and mechanical loading. A better understanding of the failure of cutting tools and capability to predict tool life are key factors in the development of new tool materials with improved mechanical behaviour. Main failure mechanisms are wear, thermal-mechanical fatigue and brittle fracture. The aim of presen...
Flexural behaviour of hybrid laminated composites
Reis, P. N. B.; Ferreira, J. A. M.; Antunes, F. V.; Costa, J. D. M.The present paper studies the flexural behaviour of hand manufactured hybrid laminated composites with a hemp natural fibre/polypropylene core and two glass fibres/polypropylene surface layers at each side of the specimen. When compared with full glass fibres reinforced polypropylene laminates, the hybrid composites have economical, ecological and recycling advantages and also specific fatigue strength benefits...
Fatigue damage and environment interaction of polyester aluminized glass fiber ...
Ferreira, J. M.; Pires, J. T. B.; Costa, J. D.; Errajhi, O. A.; Richardson, M.Aluminized glass fiber composites in a polyester matrix were used in this work in an attempt to study their fatigue resistance under both dry and water saturated ambient conditions (compared to conventional glass fiber composites). These composites, containing specially modified fibers, exhibit increased thermal and electrical conduction properties whilst still being potentially adequate for many structural app...
Fatigue damage analysis of aluminized glass fiber composites
Ferreira, J. M.; Pires, J. T. B.; Costa, J. D.; Zhang, Z. Y.; Errajhi, O. A.; Richardson, M.Aluminized glass fiber composite with epoxy and polyester matrix were used in this work in order to study fatigue properties and its comparison to conventional glass fiber composites. Until now aluminized glass fiber materials have been only used as decoy flares in military applications. The innovative advantages of these composites, using modified fibers, are potentially the improvement of thermal and electric...
Stress analysis of lap joints involving natural fibre reinforced interface layers
Ferreira, J. M.; Silva, H.; Costa, J. D.; Richardson, M.This paper is concerned with a fatigue study of composite adhesive lap joints. The tests were carried out on specimen joints manufactured using different stacking sequences: solely bi-directional woven E-glass fibres and polypropylene composites; and hybrid stacked composites. The main objective of the work was to improve the fatigue strength using hybrid fibre composites with a polypropylene/hemp natural fibre...
Thermal fatigue assessment of components made with particulate polymer composites
Capela, C.; Costa, J. D.; Antunes, F.; Ferreira, J. M.Many appliance materials are made of PMMA/Si acrylic casting dispersion. In these situations, failure can occur by thermal fatigue induced by severe temperature variations such as alternating flows of cold and hot water. This paper is concerned with the numerical analysis of the thermal stresses in three composites with different volume fractions of filler and particle size. Their trade marks are Asterite, Amat...
Improvement of the mechanical response of an electrical component
Antunes, F. J. V.; Costa, J. D. M.; Ferreira, J. A. M.The electrical component under analysis does not fulfil the mechanical performance required by the standard (a minimum force of 400 gf during the extraction of a 3.8 mm diameter pin after the introduction of a 5.1 mm pin). A numerical study using the finite element method was developed to understand the limited response of the component and to study the effect of changing material and geometry. Experimental tes...
Fatigue analysis of thin AlMgSi welded joints under constant and variable ampli...
Pinho-da-Cruz, J. A. M.; Ferreira, J. A. M.; Costa, J. D. M.; Borrego, L. F. P.This paper reports the fatigue behaviour of thin AlMgSi1 aluminium alloy weldments and the improvement in fatigue strength due to post-weld treatments. Several fatigue tests were performed using two distinct types of thin welded joints, T and single lap, manufactured using a 6xxx series aluminium alloy, and the efficiency of fatigue life improvement techniques, such as post-weld heat treatment and weld toe's bu...
Influência da época da poda do clone GT1 de Hevea brasiliensis na produção de b...
MEDRADO, M. J. S.; COSTA, J. D.; FONSECA FILHO, H.2002
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