A.B. de Morais
University of Aveiro
Ultimate tensile strengthMode (statistics)Finite element methodData reductionComposite materialEpoxyBeam (structure)Timoshenko beam theoryMaterials scienceDouble cantilever beamStrain energy release rateFracture (geology)Fracture mechanicsStructural engineeringAdhesiveDelaminationCrack closureBendingStress (mechanics)Fracture toughness
58Publications
26H-index
1,591Citations
Publications 59
Newest
#6Eric Maire (University of Lyon)H-Index: 8
Abstract null null Longitudinal tensile failure of unidirectional fibre-reinforced composites remains difficult to predict accurately. The key underlying mechanism is the tensile failure of individual fibres. This paper objectively measured the relevant input data and performed a detailed experimental validation of blind predictions of six state-of-the-art models using high-resolution in-situ synchrotron radiation computed tomography (SRCT) measurements on two carbon fibre/epoxy composites. Mode...
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#1A.B. de Morais (University of Aveiro)H-Index: 26
Abstract Despite providing interesting mode-mix ratios without elaborate test fixtures, asymmetrically delaminated specimens have been scarcely used for characterizing delamination resistance. This is mostly due to the elaborate analyses employed and the controversy about mode partitioning. This paper presents a beam model for asymmetrically delaminated unidirectional composite specimens. The physical meaning and underlying assumptions of the solutions obtained are clearly identified. Comparison...
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#1M. M. Alves (University of Aveiro)H-Index: 1
#2L. M. Abreu (Gazeta Tema)H-Index: 1
Last. A.B. de Morais (University of Aveiro)H-Index: 26
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ABSTRACTThe adhesively bonded 3-point bending specimen was employed for obtaining bilinear elastic-plastic approximations to the shear stress-strain behaviour of a common acrylic adhesive. The para...
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#1Christian Breite (Katholieke Universiteit Leuven)H-Index: 4
#2Arsen Melnikov (Katholieke Universiteit Leuven)H-Index: 3
Last. Yentl Swolfs (Katholieke Universiteit Leuven)H-Index: 24
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Abstract Many models for prediction of longitudinal tensile failure of unidirectional (UD) composites have been developed in the last decades. These models require significant assumptions and simplifications, but their consequences for the predictions are often not clearly understood. This paper therefore presents a blind benchmark of seven different models applied to two virtual materials. Reliably capturing the localisation of stress concentrations was vital in predicting the effect of matrix ...
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Abstract Cohesive zone modelling is increasingly applied to predict the strength of structural adhesive joints. A method is here proposed to determine the bondline shear traction-separation law needed for cohesive zone models. The method combines an effective crack length approach derived from a beam model and an existing J-integral analysis of the end-notched flexure specimen. The resulting work done by the tractions versus separation curves can be easily processed with direct or mixed direct-i...
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Abstract The adhesively bonded 3-point bending specimen has been recently considered for evaluating the adhesive shear stress-strain behaviour. Its main advantage is avoiding the spurious end effects typical of lap-joints. A previous beam model proved to be fairly accurate for thin bondlines typical of structural joints. The present study extends such model to thick bondlines and achieves improved shear strain results. Model predictions were in very good agreement with finite element analyses of...
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#1A.B. de Morais (University of Aveiro)H-Index: 26
ABSTRACTThe mode II fracture of adhesive joints is well-known to involve large fracture process zones. Their effect in fracture energy measurements can be taken into account by the effective crack length approach. Moreover, fracture process zones can be simulated by cohesive zone models, which are increasingly used for structural analysis of adhesive joints. This paper aimed at evaluating the influence of the traction-separation law on the fracture process zone and on the effective crack length ...
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Abstract Mode II delamination testing for measuring the critical strain-energy release rate has reached a high level of maturity with the recent publication of ISO and ASTM standards. Cohesive zone modelling has also become a well-established design tool implemented in many commercial finite element analysis codes. The particularly large fracture process zone in mode II delamination increases the relevance of the traction-separation law. This paper proposes a fairly simple inverse method to eval...
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#1A.B. de Morais (University of Aveiro)H-Index: 26
ABSTRACTThe double cantilever beam specimen has been increasingly employed to enable the development of cohesive zone models for adhesive joints. Evaluation of the traction–separation law (TSL) requires elaborate experimental techniques and usually relies on data measured until the crack initiation point. Nonetheless, current standards stipulate fracture energy measurements under steady-state crack propagation. This paper investigated the influence of the cohesive zone on the commonly used corre...
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Abstract The end-notched flexure (ENF) specimen has often been employed to characterise the mode II fracture of adhesive joints. This paper reports a beam model for ENF specimens with metal adherends and typical bondline thickness values. The initial formulation adopting adhesive linear elasticity predicted accurately the shear stress distribution, the compliance and the strain-energy release rate. The adhesive elastic-perfectly plastic behaviour subsequently introduced generated a plastic zone ...
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