Encontrados 5 documentos, a visualizar página 1 de 1
Residual stresses analysis of ND-YAG laser welded joints
Costa, J. M.; Pires, J. T. B.; Antunes, F.; Nobre, J. P.; Borrego, L. P.http://www.sciencedirect.com/science/article/B6V2X-4V3546Y-2/2/8ee5852dd432955cfe324f9228305af1
Mould steels repaired by laser welding
Borrego, L. P.; Pires, J. T. B.; Costa, J. M.; Ferreira, J. M.Laser-deposit welding, by using Nd-YAG, is a mould repairing process, which has the advantages relatively to the traditional methods of achieving a less change of the metal composition around the repaired zone and permitting a very accurate deposition of a small volume of the filler material in the area chosen at the work-piece surface. This paper presents a fatigue study in specimens of two base materials used...
Fatigue behaviour of laser repairing welded joints
Borrego, L. P.; Pires, J. T. B.; Costa, J. M.; Ferreira, J. M.This paper presents a fatigue study in Nd-YAG laser surface repairing welded joints in specimens of two base materials used in mould production. The tests were carried out in a servo-hydraulic machine in tension, under constant amplitude loading, with two stress ratios R = 0 and R = 0.4. Welded specimens were prepared with U notches and filled with laser welding deposits. The fatigue results are presented in th...
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...
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