Encontrados 9 documentos, a visualizar página 1 de 1
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...
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...
Fatigue behaviour of composite adhesive lap joints
Ferreira, J. A. M.; Reis, P. N.; Costa, J. D. M.; Richardson, M. O. W.http://www.sciencedirect.com/science/article/B6TWT-45YG5WP-1/1/d57bc6251d123772bfdb57edd6cc3916
Analysis of fatigue and damage in glass-fibre-reinforced polypropylene composit...
Ferreira, J. A. M.; Costa, J. D. M.; Reis, P. N. B.; Richardson, M. O. W.This paper concerns fatigue studies of polypropylene/glass-fibre thermoplastic composites produced from a bi-directional woven cloth of co-mingled E-glass fibres and polypropylene fibres with a fibre volume fraction Vf of 0.338. The effect of lay-up design and load conditions on fatigue performance were investigated. The S-N curves, the rise in the temperature of the specimens, and the loss of stiffness during ...
Static and fatigue behaviour of glass-fibre-reinforced polypropylene composites
Ferreira, J. A. M.; Costa, J. D. M.; Reis, P. N. B.This paper is concerned with fatigue of polypropylene/glass-fibre thermoplastic composites produced from a bi-directional woven cloth mixture of E glass fibres and polypropylene fibres. The latter becomes the matrix after the application of heat and pressure. This composite was manufactured with a fibre volume fraction Vf of 0.338. The effect of layer design on the static and fatigue performance was investigate...
Effect of stress ratio and specimen thickness on fatigue crack growth of CK45 s...
Costa, J. D. M.; Ferreira, J. A. M.Presented are the effect of stress ratio and thickness on the fatigue crack growth rate of CK45 steel according to DIN 17200. Test results are obtained for constant amplitude load in tension with three stress ratios of R=0, 0.2 and 0.4 and three specimen thicknesses of B=6, 12 and 24 mm. Microgauge crack opening values were used to calculate [Delta]Keff values from which the da/dN - [Delta]Keff curves are obtai...
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