Search results for: M.O.W. Richardson

Items from 1 to 20 out of 22 results

article

Mixed Mode interlayer fracture of glass fiber/nano-enhanced epoxy composites

H. Silva, J.A.M. Ferreira, C. Capela, M.O.W. Richardson

Composites Part A > 2014 > 64 > Complete > 211-222

Increasing interlaminar fracture toughness (IFT) has long been an important goal in the fiber reinforced composites field. For that purpose some research has recently explored the use of nanoparticle reinforced matrices to improve interlaminar strength. In this present paper a small quantity of nanoclays (NC) and multiwalled carbon nanotubes (MWCNT) were used in order to enhance the IFT of glass fiber/epoxy...

article

Impact strength of composites with nano-enhanced resin after fire exposure

P.N.B. Reis, J.A.M. Ferreira, Z.Y. Zhang, T. Benameur, more

Composites Part B > 2014 > 56 > Complete > 290-295

Composite materials have been widely used in several engineering applications. However, there are very few studies about the effects of nanoclays on the impact strength of laminates after exposure to the fire. Therefore, this paper intends to study this subject and the impact performance was analysed by low velocity impact tests carried out at different incident impact energy levels. For better dispersion...

article

Impact response of Kevlar composites with nanoclay enhanced epoxy matrix

P.N.B. Reis, J.A.M. Ferreira, Z.Y. Zhang, T. Benameur, more

Composites Part B > 2013 > 46 > Complete > 7-14

Kevlar fibres have been widely used as impact-resistant reinforcement in composite materials. However, there are very few works about the effects of nanoclays on the impact strength of Kevlar/epoxy laminates. Therefore, this paper intends to study the ideal amount of nanoclays to obtain the best impact performance. Nanoclays Cloisite 30B were dispersed in the epoxy system of at 1.5%, 3% and 6% in...

article

Influence of surface treatments on the physicochemical properties of short sisal fibers: Ethylene vinyl acetate composites

T.J. Madera‐Santana, H. Soto Valdez, M.O.W. Richardson

Polymer Engineering & Science > 53 > 1 > 59 - 68

Natural fibers (NFs) are rich in cellulose and also they are a low cost, easily renewable source for polymer composites. However, the presence of impurities (waxes, lignin, etc.) and hydroxyl groups produce those NFs with less ability to reinforce polymeric matrices. Short sisal fibers (SSF) were subjected to three different chemical treatments (alkaline, dicumyl peroxide, and silane). Composites...

article

Impact response of Kevlar composites with filled epoxy matrix

P.N.B. Reis, J.A.M. Ferreira, P. Santos, M.O.W. Richardson, more

Composite Structures > 2012 > 94 > 12 > 3520-3528

Kevlar fibres have been widely used as impact-resistant reinforcement in composite materials. The paper studies the impact behaviour as well as damage tolerance of Kevlar/filled epoxy matrix. Two different fillers, cork powder and nanoclays Cloisite 30B, were used in order to improve the impact response of these laminates. For better dispersion and interface adhesion matrix/clay nanoclays were previously...

article

Effect of layered silicate reinforcement on the structure and mechanical properties of spent polyamide-12 nanocomposites

B. Aldousiri, H.N. Dhakal, S. Onuh, Z.Y. Zhang, more

Composites Part B > 2012 > 43 > 3 > 1363-1367

The aim of this work was to study the structure and mechanical properties of spent polyamide-12 and spent polyamide-12/layered silicate reinforced novel nanocomposites. Layered silicate at 1, 3, 5 and 7wt.% was incorporated in spent polyamide-12 and its nanocomposites were prepared using single screw injection moulding technique. The interlamellar structure and surface morphology were characterised...

article

A study of the mechanical properties on polypropylene enhanced by surface treated nanoclays

J.A.M. Ferreira, P.N.B. Reis, J.D.M. Costa, B.C.H. Richardson, more

Composites Part B > 2011 > 42 > 6 > 1366-1372

This paper presents the results of a current study concerned with the mechanical properties of a polypropylene binder resin, enhanced by nanoclay filler. The study was centred on the potential benefits obtained by the addition of specially surface treated nanoclays on the stiffness, toughness and also on static and fatigue strength. Specimens were produced by an injection moulding process with 3%...

article

A study of water absorption characteristics of a novel nano-gelcoat for marine application

S.C. See, Z.Y. Zhang, M.O.W. Richardson

Progress in Organic Coatings > 2009 > 65 > 2 > 169-174

One of the major factors affecting the acceptability of novel coating in engineering applications is the degradation of the coating by the moistures that will affect the physical and mechanical performances and causing it to fail. Nanoscale reinforcement provides opportunities for enhancing the polymer system with unique properties and increases the performance. These advantages not only lead to an...

article

Fatigue life evaluation for carbon/epoxy laminate composites under constant and variable block loading

P.N.B. Reis, J.A.M. Ferreira, J.D.M. Costa, M.O.W. Richardson

Composites Science and Technology > 2009 > 69 > 2 > 154-160

This paper presents the results of current research on the fatigue life prediction of carbon/epoxy laminate composites involving twelve balanced woven bidirectional layers of carbon fibres and epoxy resin manufactured by a vacuum moulding method. The plates were produced with 3mm thickness and 0.66 fibre weight fraction. The dog bone shape specimens were cut from these plates with the load line aligned...

article

The low velocity impact response of non-woven hemp fibre reinforced unsaturated polyester composites

H.N. Dhakal, Z.Y. Zhang, M.O.W. Richardson, O.A.Z. Errajhi

Composite Structures > 2007 > 81 > 4 > 559-567

Hemp fibre reinforced unsaturated polyester composites (HFRUPE) were subjected to low velocity impact tests in order to study the effects of non-woven hemp fibre reinforcement on their impact properties. HFRUPE composites specimens containing 0, 0.06, 0.10, 0.15, 0.21 and 0.26 fibre volume fractions (V _f ) were prepared and their impact response compared with samples containing an equivalent...

article

Low velocity impact induced damage evaluation and its effect on the residual flexural properties of pultruded GRP composites

Z.Y. Zhang, M.O.W. Richardson

Composite Structures > 2007 > 81 > 2 > 195-201

Low velocity impact induced non-penetration damage in pultruded glass fibre reinforced polyester (GRP) composite materials was investigated using an instrumented falling weight impact test machine with a chisel shaped impactor. The characteristics of the impact event, force/time and force/deflection traces were determined. The internal damage was visualised and quantified by Electronic Speckle Pattern...

article

Effect of water absorption on the mechanical properties of hemp fibre reinforced unsaturated polyester composites

H.N. Dhakal, Z.Y. Zhang, M.O.W. Richardson

Composites Science and Technology > 2007 > 67 > 7-8 > 1674-1683

Hemp fibre reinforced unsaturated polyester composites (HFRUPE) were subjected to water immersion tests in order to study the effects of water absorption on the mechanical properties. HFRUPE composites specimens containing 0, 0.10, 0.15, 0.21 and 0.26 fibre volume fraction were prepared. Water absorption tests were conducted by immersing specimens in a de-ionised water bath at 25°C and 100°C for different...

article

Thermogravimetric analysis of aluminised E-glass fibre reinforced unsaturated polyester composites

J.M. Ferreira, O.A.Z. Errajhi, M.O.W. Richardson

Polymer Testing > 2006 > 25 > 8 > 1091-1094

Novel aluminised E-glass fibre reinforced unsaturated polyester composites, originally formulated for enhanced thermal and electrical shielding properties were evaluated in terms of their thermal performance. The thermal degradation of these specimens was analysed using a thermogravimetric analyser (TGA). The samples were heated from ambient temperature to 500°C at a heating rate of 20°C/min. All...

article

Water absorption characteristics of aluminised E-glass fibre reinforced unsaturated polyester composites

O.A.Z. Errajhi, J.R.F. Osborne, M.O.W. Richardson, H.N. Dhakal

Composite Structures > 2005 > 71 > 3-4 > 333-336

Novel aluminised E-glass fibre reinforced unsaturated polyester composites, originally formulated for enhanced thermal and electrical shielding properties were evaluated in terms of their water absorption. One of the major obstacles delaying the acceptance of novel composites in engineering applications is the degradation of the polymer matrix material by moisture, which effects the physical and mechanical...

article

Visualisation of barely visible impact damage in polymer matrix composites using an optical deformation and strain measurement system (ODSMS)

Z.Y. Zhang, M.O.W. Richardson

Composites Part A > 2005 > 36 > 8 > 1073-1078

This study deals with damage evaluation using an Optical Deformation and Strain Measurement System (ODSMS). Damage was introduced using an Instrumented Falling Weight Impact Test (IFWIT) machine. The incident impact energy was controlled to low magnitude so that the specimen was not penetrated and only internal or barely visible damage was introduced. This damage can have an adverse effect on structural...

article

Experimental investigation and flow visualisation of the resin transfer mould filling process for non-woven hemp reinforced phenolic composites

M.O.W. Richardson, Z.Y. Zhang

Composites Part A > 2000 > 31 > 12 > 1303-1310

Resin transfer moulding (RTM) of glass fibre reinforced polymeric composites offers the advantages of automation, low cost and versatile design of fibre reinforcement. A replacement of glass fibres with natural plant fibres as reinforcement in polymeric composites provides additional technological, economical, ecological and environmental benefits. The resin transfer mould filling process has significant...

article

Micro-heterogeneity of urethane vinylester resin networks

J. Zhang, M.O.W. Richardson

Polymer > 2000 > 41 > 18 > 6843-6849

The morphological structure of a fully cross-linked vinylester Atlac 580 resin has been studied by using modulated differential scanning calorimetry (MDSC). The results show that the networks exhibit a diphasic structure, characterised by the presence of two glass transition temperatures (T _g ). It is believed that the two phases are composed of a polystyrene-rich phase and a vinylester-rich...

article

Monitoring the corrosion behaviour of chromate-passivated aluminium alloy 2014 A-T6 by electrochemical impedance spectroscopy during salt fog exposure

G.M. Treacy, G.D. Wilcox, M.O.W. Richardson

Surface & Coatings Technology > 1999 > 114 > 2-3 > 260-268

Electrochemical impedance spectroscopy (EIS) of unpassivated and chromate-passivated Al 2014 A-T6 was carried out at intervals during the course of neutral salt spray corrosion tests. At given time intervals, the samples were removed from the salt fog cabinet in order to perform EIS in 3.5% NaCl at an open circuit potential with a 10mV a.c. amplitude. For unpassivated Al 2014 A-T6, impedance results...

article

Glass fibre coating for optimum mechanical properties of vinyl ester composites

S.H. Saidpour, M.O.W. Richardson

Composites Part A > 1997 > 28 > 11 > 971-975

To achieve optimum mechanical properties the reinforcement sizing system has to be fully compatible with both reinforcement and resin systems. In this study, four different silane and one titanate coupling agents were used, at three different concentrations, to achieve optimum mechanical properties in unidirectional glass reinforced vinyl ester composite materials. Interlaminar shear strength and...

article

Effect of notch and test conditions on the fatigue of a glass-fibre-reinforced polypropylene composite

J.A.M. Ferreira, J.D.M. Costa, M.O.W. Richardson

Composites Science and Technology > 1997 > 57 > 9-10 > 1243-1248

This paper is concerned with fatigue studies of polypropylene/glass-fibre thermoplastic composites produced from a bidirectional woven cloth of commingled E-glass and polypropylene fibres (the latter becoming the matrix after the application of heat and pressure). This composite was manufactured with a fibre volume fraction of 0.338. The effects of frequency, stress ratio, temperature and stress concentration...

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Search results for: M.O.W. Richardson

Mixed Mode interlayer fracture of glass fiber/nano-enhanced epoxy composites

Impact strength of composites with nano-enhanced resin after fire exposure

Impact response of Kevlar composites with nanoclay enhanced epoxy matrix

Influence of surface treatments on the physicochemical properties of short sisal fibers: Ethylene vinyl acetate composites

Impact response of Kevlar composites with filled epoxy matrix

Effect of layered silicate reinforcement on the structure and mechanical properties of spent polyamide-12 nanocomposites

A study of the mechanical properties on polypropylene enhanced by surface treated nanoclays

A study of water absorption characteristics of a novel nano-gelcoat for marine application

Fatigue life evaluation for carbon/epoxy laminate composites under constant and variable block loading

The low velocity impact response of non-woven hemp fibre reinforced unsaturated polyester composites

Low velocity impact induced damage evaluation and its effect on the residual flexural properties of pultruded GRP composites

Effect of water absorption on the mechanical properties of hemp fibre reinforced unsaturated polyester composites

Thermogravimetric analysis of aluminised E-glass fibre reinforced unsaturated polyester composites

Water absorption characteristics of aluminised E-glass fibre reinforced unsaturated polyester composites

Visualisation of barely visible impact damage in polymer matrix composites using an optical deformation and strain measurement system (ODSMS)

Experimental investigation and flow visualisation of the resin transfer mould filling process for non-woven hemp reinforced phenolic composites

Micro-heterogeneity of urethane vinylester resin networks

Monitoring the corrosion behaviour of chromate-passivated aluminium alloy 2014 A-T6 by electrochemical impedance spectroscopy during salt fog exposure

Glass fibre coating for optimum mechanical properties of vinyl ester composites

Effect of notch and test conditions on the fatigue of a glass-fibre-reinforced polypropylene composite

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