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Modelação da furação de laminados por elementos finitos
Durão, Luís M.; Gonçalves, Daniel J. S.; Moura, M. F. S. F. de; Marques, A. T.Furação de estruturas em compósitos de matriz polimérica ; O recurso ao Método de Elementos Finitos (MEF) para a simulação e estudo da maquinagem tem vindo a merecer um interesse crescente. Neste trabalho comparam-se os resultados experimentais obtidos usando diferentes brocas helicoidais com uma simulação numérica da furação usando elementos sólidos tridimensionais do software ABAQUS® Explicit. Os resultados ...
Using a cohesive damage model to predict the tensile behaviour of CFRP single-s...
Campilho, Raul; Moura, M. F. S. F. de; Domingues, J. J. M. S.This work addresses both experimental and numerical analyses regarding the tensile behaviour of CFRP single-strap repairs. Two fundamental geometrical parameters were studied: overlap length and patch thickness. The numerical model used ABAQUS® software and a developed cohesive mixed-mode damage model adequate for ductile adhesives, and implemented within interface finite elements. Stress analyses and strength ...
Taper angle optimization of scarf repairs in carbon-epoxy laminates
Campilho, Raul; Pinto, A. M. G.; Moura, M. F. S. F. de; Mendes, Isabel R.; Banea, Mariana D.; Silva, Lucas F. M. daThe increasing use of Carbon-Fibre Reinforced Plastic (CFRP) laminates in high responsibility applications introduces an issue regarding their handling after damage. The availability of efficient repair methods is essential to restore the strength of the structure. The availability of accurate predictive tools for the repairs behaviour is also essential for the reduction of costs and time associated to extensiv...
A new data reduction scheme to obtain the mode II fracture properties of Pinus ...
Silva, M. A. L.; Moura, M. F. S. F. de; Morais, A. B. de; Morais, J. J. L.In this work a numerical study of the End Notched Flexure (ENF) specimen was performed in order to obtain the mode II critical strain energy released rate (GIIc) of a Pinus pinaster wood in the RL crack propagation system. The analysis included interface finite elements and a progressive damage model based on indirect use of Fracture Mechanics. The difficulties in monitoring the crack length during an experimen...
Finite element analysis of the ECT test on mode III interlaminar fracture of ca...
Moura, M. F. S. F. de; Silva, M. A. L.; Morais, A. B. de; Morais, J. J. L.In this work a parametric study of the Edge Crack Torsion (ECT) specimen was performed in order to maximize the mode III component (GIII) of the strain energy release rate for carbon-epoxy laminates. A three-dimensional finite element analysis of the ECT test was conducted considering a [90/0/(+45/-45)2/(-45/+45)2/0/90]S lay-up. The main objective was to define an adequate geometry to obtain an almost pure mode...
A new methodology for the characterization of mode II fracture of pinus pinaste...
Moura, M. F. S. F. de; Silva, M. A. L.; Morais, J. J. L.; Morais, A. B. de; Lousada, J. L.In this study, the End Notched Flexure (ENF) fracture test was used to obtain the mode II Rcurve of the Pinus pinaster wood in the RL crack propagation system. The test method was numerically and experimentally analyzed. In the numerical study, three (3D) and twodimensional (2D) finite element analyses were conducted to determine the mode II critical strain energy release rate (GIIc) and the respective R-curve....
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