Cooperative Research Center for Advanced Composite Structures

Port Melbourne, Australia

Cooperative Research Center for Advanced Composite Structures

Port Melbourne, Australia

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Joosten M.W.,University of New South Wales | Dutton S.,University of New South Wales | Kelly D.,University of New South Wales | Thomson R.,Cooperative Research Center for Advanced Composite Structures
Composites Part A: Applied Science and Manufacturing | Year: 2010

An experimental evaluation of the energy absorption of constrained triggered sandwich structures is presented. Four configurations of embedded ply-drop triggering mechanisms were analysed and compared. A composite pi-joint was then developed to provide a constraint fixture that is representative of an in-service integrated energy absorbing structure. The specimens tested within the pi-joints obtained slightly lower specific energy absorption compared to the equivalent specimens tested in a rigid test fixture. The potential of an integrated energy absorbing triggered sandwich structure contained within a composite pi-joint was demonstrated. The interface between the sandwich panel and the pi-joint was not bonded, and further research will focus on the development of a bonded joint configuration suitable for structural applications. © 2010 Elsevier Ltd. All rights reserved.


Ashraf M.A.,University of New South Wales | Ashraf M.A.,Cooperative Research Center for Advanced Composite Structures | Morozov E.V.,University of New South Wales | Shankar K.,Cooperative Research Center for Advanced Composite Structures
Journal of Reinforced Plastics and Composites | Year: 2014

This article is concerned with the numerical modelling and analysis of the mechanical behaviour of composite pipes used for offshore oil and gas applications. Specifically, the bending of the reinforced thermoplastic pipes during the reeling process of reel-lay installation is modelled using non-linear finite-element procedures. In particular, the possible buckling of the reeled composite pipes has been investigated. Composite pipes reinforced with one angle-ply and two angle-ply layers are considered and the effects of different diameter-to-thickness ratios and different angle-ply combinations on the mechanical behaviour of these pipes have been studied. © 2014 The Author(s).


Agarwal A.,University of New South Wales | Agarwal A.,Cooperative Research Center for Advanced Composite Structures | Foster S.J.,University of New South Wales | Hamed E.,University of New South Wales | And 2 more authors.
Composites Part B: Engineering | Year: 2014

The long term durability of FRP strengthened steel structures under freeze thaw cycles is a key parameter in their design. This paper presents an experimental investigation of the effect of freeze-thaw exposure on the bond strength and the mode of failure of steel-CFRP lap joints. A total of 48 single lap shear specimens were prepared and exposed to varying numbers of freeze-thaw cycles before being tested to failure at room temperature. The results show that the freeze-thaw cycling decreases the bond strength by about 28% and leads to variations in the mode of failure. A separate set of tests was also conducted on adhesive tensile specimens under similar conditions as those of the steel-CFRP joints, which showed a reduction in the initial elastic modulus after exposure to freeze-thaw cycling. A simple shear stress-slip model is used to predict the failure load of the specimens, which reveals a good correlation with the experimental results. © 2013 Elsevier Ltd. All rights reserved.


Jackson A.,University of New South Wales | Dutton S.,University of New South Wales | Gunnion A.J.,Cooperative Research Center for Advanced Composite Structures | Kelly D.,University of New South Wales
Composite Structures | Year: 2011

The effect laminate design on the crush performance of carbon-fibre/epoxy "DLR" crush elements has been experimentally investigated. A quasi-isotropic lay-up was found to result in the highest Specific Energy Absorption (SEA) for Four-Harness (4HS) reinforced laminates; however a hybrid of unidirectional weave and 4HS fabric produced the highest SEA of 114 kJ/kg. Interleaving with thin thermoplastic films increased the steady state crushing force, however the increase in laminate density associated with the addition of the film caused no improvement and in some cases a reduction in SEA depending on material and lay-up. Dynamic crush testing of selected laminate designs resulted in a reduction in SEA of between 6% and 15% compared to the quasi-static case. © 2011 Elsevier Ltd.


Joosten M.W.,University of New South Wales | Dutton S.,University of New South Wales | Kelly D.,University of New South Wales | Thomson R.,Cooperative Research Center for Advanced Composite Structures
Composite Structures | Year: 2011

The quasi-static crushing response of carbon epoxy composite hat-shaped crush elements is described herein. A steeple-type triggering mechanism was used to ensure the specimens exhibited a continuous stable crushing mode of failure. The explicit finite element software PAM-CRASH was used to predict the crushing failure of these energy absorbing elements. A four-layer, stacked-shell model of the composite hat-shaped element, after calibration against experimental test data, was found to be capable of closely approximating the failure modes and provide agreement with the load vs. displacement behaviour observed during the experiments. The predicted steady state load and specific energy absorption were respectively within 1.5 and 0.2% of the experimental average. With further validation, the developed stacked-shell methodology could help provide a predictive tool to characterise the energy absorption of open section crush elements and significantly reduce the cost associated with an extensive experimental material characterisation test program. © 2010 Elsevier Ltd.


Kim M.K.,RMIT University | Elder D.J.,Cooperative Research Center for Advanced Composite Structures | Wang C.H.,RMIT University | Feih S.,RMIT University
Composite Structures | Year: 2012

Impact tests were carried out on composite laminates and composite scarf repairs, while both were subjected to in-plane loading with tensile pre-strain levels up to 5000microstrain. The results show that pre-straining of the composite laminates has no noticeable influence on the size of the delamination area for the given impact energy of 8J, which represents a typical barely-visible impact on thin-skin composite structures. For composite scarf joints, however, resulting damage has been found to be a combination of adhesive disbonding and matrix cracking (delamination and intraply cracking) in the composite laminate. The size of this mixed type of damage increases significantly with increasing pre-strain levels. A finite element model was developed to investigate the interaction between adhesive disbonding and composite delamination. The computational results reveal that both delamination and adhesive disbonding are dominated by the mode II fracture. Since the critical mode II fracture energy release rate for composite laminates (G IIC=1.08kJ/m 2) is much less than that pertinent to the adhesive (G IIC=3.73kJ/m 2), delamination tends to occur first in the composite laminates, which then shield the growth of disbonding in the adhesive. © 2011 Elsevier Ltd.


Ang J.,RMIT University | Li H.C.H.,RMIT University | Herszberg I.,Cooperative Research Center for Advanced Composite Structures | Bannister M.K.,Cooperative Research Center for Advanced Composite Structures | Mouritz A.P.,RMIT University
International Journal of Fatigue | Year: 2010

This paper presents an experimental study into the tensile strength and fatigue properties of uncoated optical glass fibres containing Bragg grating (FBG) sensors. The protective polymer coating of the optical fibres must be removed by chemical or mechanical stripping methods to produce the Bragg gratings in the fibre core. This paper investigates the effects of chemical or mechanical stripping on the sensor integrity, operating life and damage mechanisms of the fibres when they have not been recoated after producing the Bragg gratings. The fatigue properties of the chemically or mechanically stripped fibre sensors were evaluated under cyclic tension-tension loading when externally bonded to carbon fibre-epoxy substrates representative of aircraft composite structures. The tensile strength of the mechanically stripped fibre was lower than the chemically stripped fibre because larger surface flaws were created during removal of the polymer coating. Tension fatigue life (S-N) curves of the chemically and mechanically stripped fibres were measured, and the fatigue life and signal quality of the FBG sensors decreased rapidly with increasing maximum fatigue strain. The signal quality of the FBG sensors degraded with increasing number of load cycles due to the formation of sub-critical cracks within the fibre by stress-corrosion. The fatigue life and sensor performance under cyclic loading was superior for the chemically stripped sensors. The S-N curves exhibit a fatigue endurance limit (at 106 load cycles), below which chemically and mechanically stripped fibres have an infinite fatigue life and there is no degradation to the FBG sensor signal quality. © 2009 Elsevier Ltd. All rights reserved.


Islam M.S.,University of Sydney | Islam M.S.,Cooperative Research Center for Advanced Composite Structures | Tong L.,University of Sydney
International Journal of Adhesion and Adhesives | Year: 2016

Installing and repairing of oil and gas infrastructure is required to be conducted out of water (OW) and in water (IW). In service, this infrastructure is subjected to various environmental ageing which may affect its mechanical performance. In this study the shear strength of metal-glass epoxy prepreg composites was investigated using single lap joint (SLJ) testing. For this, three different surface preparation methods (grit blasting, wire brushing and needle gunning) and two different manufacturing methods (OW and IW) were employed. Results showed that the specimens prepared by grit blasting had superior shear strength followed by these by needle gunning and wire brushed for both OW and IW methods. Manufactured specimens were also subjected to hygrothermal conditioning (WC) and ambient humidity conditioning (HC) to assess the durability of the produced SLJ specimens. The WC specimens absorbed more moisture than the HC specimens and the shear strength of the WC specimens were found to have deteriorated more than the HC specimens. For the conditioned SLJ specimens, the lower loss of shear strength was found with specimens manufactured IW when compared to specimens manufactured OW for grit blasted and needle gunned specimens and an opposite trend was seen for wire brushed specimens. However, the loss of shear strength was found to be varied with the moisture uptake for individual surface preparation technique and the variation was considered to be due to a combination of many factors other than the type of adhesive used such as metal surface profile, failure mode, rust formation and presence of black coloured metallic remnants. © 2016 Elsevier Ltd.


Islam M.S.,University of Sydney | Islam M.S.,Cooperative Research Center for Advanced Composite Structures | Tong L.,University of Sydney
Composites Part A: Applied Science and Manufacturing | Year: 2016

This study presents an experimental investigation into the effects of through-thickness pinning reinforcement on the static strength and damage tolerance of hybrid mild steel-glass fibre prepreg co-cured composite single lap joints (SLJ). Stainless steel pins of 0.3 mm in diameter were inserted as mechanical fastening, in addition to adhesive bonding, to form hybrid joints between metal and glass fibre reinforced polymer substrates. Using the hybrid SLJ tensile testing, the failure modes and static strength were experimentally determined for mild steel-glass fibre prepreg co-cured composites. It is revealed that pinning can improve the static failure load via bridging mechanism by as much as 58% depending on the number and location of pins and the presence of clamping due to bent-ends. © 2016 Elsevier Ltd. All rights reserved.


Shamsuddoha M.,University of Southern Queensland | Shamsuddoha M.,Cooperative Research Center for Advanced Composite Structures | Islam M.M.,University of Southern Queensland | Aravinthan T.,University of Southern Queensland | And 3 more authors.
Composite Structures | Year: 2013

Metal pipelines are the most efficient and safe ways for oil and gas transportation over a long distance. At present, almost all pipelines are made by ferrous steel which is sensitive to corrosion at harsh working environments, particularly in the presence of salty water and sulphur ingress media. For years, the most traditionally-credible solution for a damaged steel pipe is to remove the pipe entirely or just a localised damaged section and then replace it by a new one or cover with a steel patch through welding, respectively. Welding or fixing the steel patch is a bulky process especially if the location is underground or underwater. Thus, many researchers have been striving to find effective and safe repair solutions which are light, fast and easy to handle. Numerous literatures have shown that fibre-reinforced polymer-based composites can be effectively used for steel pipe repairs. Considerable research has been carried out on the repair of corroded and gouged pipes incorporating with fibre-reinforced composite wraps. This paper provides a comprehensive review on the use of fibre-reinforced polymer composites for in-air, underground and underwater pipeline repairs. Future developments and prospects on this are also discussed. Critical aspects of technical challenges, benefits and shortcomings in determining the feasibility and suitability for repair systems involving the composites are also presented. © 2013 Elsevier Ltd.

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