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A Path- and Label-cost Propagation Approach to speedup the Training of the Opti...

A. S. Iwashita; J. P. Papa; A. N. Souza; A. X. Falcão; R. Lotufo; V. M. Oliveira; Victor Hugo C. de Albuquerque; João Manuel R. S. Tavares

In general, pattern recognition techniques require a high computational burden for learning the discriminating functions that are responsible to separate samples from distinct classes. As such, there are several studies that make effort to employ machine learning algorithms in the context of "big data" classification problems. The research on this area ranges from Graphics Processing Units-based implementations...


Drilling Damage in Composite Material

Luís Miguel P. Durão; João Manuel R.S. Tavares; Victor Hugo C. de Albuquerque; Jorge Filipe S. Marques; Oscar N.G. Andrade

The characteristics of carbon fibre reinforced laminates have widened their use from aerospace to domestic appliances, and new possibilities for their usage emerge almost daily. In many of the possible applications, the laminates need to be drilled for assembly purposes. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, damage assessment...


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. Vieira

Nowadays, 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 ...


Damage evaluation of drilled carbon/epoxy laminates based on area assessment me...

Luís Miguel P. Durão; João Manuel R. S. Tavares; Victor Hugo C. de Albuquerque; Daniel J. S. Gonçalves

The characteristics of carbon fibre reinforced laminates had widened their use, from aerospace to domestic appliances. A common characteristic is the need of drilling for assembly purposes. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, delamination assessment methods based on radiographic data are compared and correlated with mechani...


Automatic microstructural characterization and classification using artificial ...

Thiago M. Nunes; Victor Hugo C. de Albuquerque; João P. Papa; Cleiton C. Silva; Paulo G. Normando; Elineudo P. Moura; João Manuel R. S. Tavares

Secondary phases such as Laves and carbides are formed during the final solidification stages of nickel based superalloy coatings deposited during the gas tungsten arc welding cold wire process. However, when aged at high temperatures, other phases can precipitate in the microstructure, like the γ″ and δ phases. This work presents a new application and evaluation of artificial intelligent techni...


Dano na furação de placas carbono/epóxido

Luís Miguel P. Durão; Daniel J.S. Gonçalves; João Manuel R.S. Tavares; Victor Hugo C. de Albuquerque; A. Monteiro Baptista

A produção de peças estruturais em materiais compósitos, nomeadamente os de matriz epóxida reforçada com fibras de carbono, tem-se tornado cada vez mais importante face à combinação das suas características específicas, como elevada rigidez e o baixo peso. Embora por um lado o custo destes materiais tenha vindo a tornar-se numa barreira cada vez menor para a sua utilização, a necessidade de operações de acabame...


Computer Techniques Towards the Automatic Characterization of Graphite Particle...

João P. Papa; Rodrigo Y. M. Nakamura; Victor Hugo C. de Albuquerque; Alexandre X. Falcão; João Manuel R. S. Tavares

The automatic characterization of particles in metallographic images has been paramount, mainly because of the importance of quantifying such microstructures in order to assess the mechanical properties of materials common used in industry. This automated characterization may avoid problems related with fatigue and possible measurement errors. In this paper, computer techniques are used and assessed towards the...


Efficient Supervised Optimum-Path Forest Classification for Large Datasets

João P. Papa; Victor Hugo C. de Albuquerque; Alexandre X. Falcão; João Manuel R. S. Tavares

Today data acquisition technologies come up with large datasets with millions of samples for statistical analysis. This creates a tremendous challenge for pattern recognition techniques, which need to be more efficient without losing their effectiveness. We have tried to circumvent the problem by reducing it into the fast computation of an optimum-path forest (OPF) in a graph derived from the training samples. ...


Comparative analysis of drills for composite laminates

Luís Miguel P. Durão; Daniel J. S. Gonçalves; João Manuel R. S. Tavares; Victor Hugo C. de Albuquerque; A. Torres Marques

The characteristics of carbon fiber-reinforced plastics allow a very broad range of uses. Drilling is often necessary to assemble different components, but this can lead to various forms of damage, such as delamination which is the most severe. However, a reduced thrust force can decrease the risk of delamination. In this work, two variables of the drilling process were compared: tool material and geometry, as ...


Damage evaluation of drilled carbon/epoxy laminates based on area assessment me...

Luís Miguel P. Durão; João Manuel R. S.Tavares; Victor Hugo C. de Albuquerque; Daniel J. S. Gonçalves

The characteristics of carbon fibre reinforced laminates had widened their use, from aerospace to domestic appliances. A common characteristic is the need of drilling for assembly purposes. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, delamination assessment methods based on radiographic data are compared and correlated with mechani...


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    Financiadores do RCAAP

Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia