8 documents found, page 1 of 1
Failure mechanisms of GRFP after long term exposure to seawater
Vidinha, H.; Branco, R.; Neto, M. A.; Amaro, A. M.; Reis, P. N. B.; Costa, J. D.The adoption of composite polymeric materials in marine applications is fully related to factors such as reliability and cost-effectiveness. The improvement in the knowledge and deep understanding of the behaviour of these materials considering the operational environment is fundamental for avoiding exceedingly high safety factors which compromise the market price. Accordingly, the effects of immersion in seawa...
Effects of different basketball shooting positions and distances on gaze behavi...
Amaro, C.M.; Amaro, A. M.; Gomes, Beatriz; Castro, Maria António; Mendes, Rui: Basketball is a sport where in order to obtain points, it is necessary to put the ball in the basket. Therefore, basketball players need to shoot the ball accurately. This study aimed to evaluate if there are differences between shooting positions and angles concerning athlete visual behavior. Tobii Pro Glasses 3 was used to measure the number and duration of fixations in the target during shooting movement. ...
Joining of fibre-reinforced thermoplastic polymer composites by friction stir w...
Pereira, Miguel A.R.; Galvão, Ivan; Costa, José D.; Amaro, A. M.; Leal, RuiThe objective of the current work is to show the potential of the friction stir welding (FSW) and its variants to join fibre-reinforced thermoplastic polymer (FRTP) composites. To accomplish that, the FSW technique and two other important variants, the friction stir spot welding (FSSW) and the refill friction stir spot welding (RFSSW), are presented and explained in a brief but complete way. Since the joining o...
Mechanical Properties of Sandwich Composites Reinforced by Nanoclays: An Overview
Parente, João; Reis, Paulo N. B.; Neto, M.; Amaro, A. M.Structural sandwich composites have been widely used in many engineering applications, and this trend continues due to their superior mechanical properties, thermal insulation and acoustic damping. However, to further improve their mechanical properties, literature reports significant benefits obtained with nano-reinforcements. In this context, nanoclays are the most popular nano-reinforcements for polymeric na...
Effects of alkaline and acid solutions on glass/epoxy composites
Amaro, A. M.; Reis, P. N. B.; Neto, M. A.; Louro, C.Composite structures can be exposed to a range of corrosive environments during their in-service life, which causes degradation in terms of material properties. The effect of alkaline and acid solutions on the GRP mechanical properties can be found in open literature, but the studies presented are not sufficient to establish a full knowledge of this subject. In this paper the flexural properties and the impact ...
Influence of multi-impacts on GFRP composites laminates
Amaro, A. M.; Reis, P. N. B.; Moura, M. F. S. F.; Neto, M. A.The behaviour of Glass Fibre Reinforced Composites (GFRPs) under single and multi-impact events of the same total energy was analysed. Experimental tests were performed considering circular simple supported plates impacted on its centre. The analyses of the results issuing from load–time, load–displacement and energy–time curves have shown that the sole impact of 3 J is more detrimental for the plate, relative ...
Low velocity impact damage evaluation in fiber glass composite plates using PZT...
Santos, M. J.; Santos, J. B.; Amaro, A. M.; Neto, M. A.In this work PZT sensors are proposed to characterize the impact effects in fiber glass composite plates. To provide effective and reliable results the analysis was accomplished on samples submitted to multiple impacts, then guaranteeing the same testing conditions for different impact levels. The analysis of the impact effect has been made by two parameters; amplitude response and time shift. PZT sensors have ...
The influence of the boundary conditions on low-velocity impact composite damage
Amaro, A. M.; Reis, P. N. B.; Magalhães, A. G.; Moura, M. F. S. F. deThe objective of this work was to study the influence of the boundary conditions on low-velocity impact behaviour of carbon-epoxy composite plates. Experimental work and numerical analysis were performed on [04,904]s laminates. The influence of different boundary conditions on the impacted plates was analysed considering rectangular and square plates. The X-radiography was used as a non-destructive technique to...