The Experts below are selected from a list of 270975 Experts worldwide ranked by ideXlab platform
Y.-x. Zhang - One of the best experts on this subject based on the ideXlab platform.
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high velocity Impact Behaviour of a new hybrid fibre reinforced cementitious composite
Advances in Structural Engineering, 2018Co-Authors: Y.-x. Zhang, Zachary Kerr, Brian Jarvis, Rhys J VolantAbstract:In this article, a new engineered cementitious composite reinforced with 0.6% volume steel fibres and 1.5% volume polyvinyl-alcohol fibres is developed aiming for enhanced Impact resistance compare...
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high velocity Impact responses of sandwich panels with metal fibre laminate skins and aluminium foam core
International Journal of Impact Engineering, 2017Co-Authors: Y.-x. Zhang, Lin YeAbstract:Abstract In this paper, high velocity Impact responses of newly designed sandwich panels with aluminium (AL) foam core and metal fibre laminate (FML) skins, which are comprised of aluminium sheets and plain woven E glass fibre composite plies are investigated. Gas gun Impact tests were conducted to investigate the high velocity Impact response of the panels subjected to the Impact from a steel ball bearing at an Impact velocity of around 210 m/s. The effect of the thickness of the foam core and FML skin on the Impact resistance of the panels is also investigated via experimental study. A finite element model is developed for effective numerical modelling of the Impact Behaviour of the sandwich panels using the commercially finite element software ANSYS LS-DYNA for more extensive study of the Impact response of the sandwich panels. The simplified Johnson Cook material model, the composite damage material model based on the Chang-Chang criteria, and the crushable foam material model are used to model the aluminium sheets, composite plies and the AL foam respectively. Three types of contact algorithms, i.e. the erosion contact type, the tie-break contact type and the general 3D contact type are employed to define the various contacts during the Impact and to model the delamination between the FML layers and debonding between the FML skin and the AL foam. The finite element model is validated by comparing the simulated Impact Behaviour to that from experimental for a sandwich panel subjected to high speed Impact and demonstrated to be effective and accurate. The effect of the shape of projectile and Impact angle on the Impact Behaviour of the sandwich panels is studied using the developed finite element model. The research findings are summarized and concluded finally.
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high velocity Impact responses of sandwich panels with metal fibre laminate skins and aluminium foam core
International Journal of Impact Engineering, 2017Co-Authors: Chengjun Liu, Y.-x. ZhangAbstract:Abstract In this paper, high velocity Impact responses of newly designed sandwich panels with aluminium (AL) foam core and metal fibre laminate (FML) skins, which are comprised of aluminium sheets and plain woven E glass fibre composite plies are investigated. Gas gun Impact tests were conducted to investigate the high velocity Impact response of the panels subjected to the Impact from a steel ball bearing at an Impact velocity of around 210 m/s. The effect of the thickness of the foam core and FML skin on the Impact resistance of the panels is also investigated via experimental study. A finite element model is developed for effective numerical modelling of the Impact Behaviour of the sandwich panels using the commercially finite element software ANSYS LS-DYNA for more extensive study of the Impact response of the sandwich panels. The simplified Johnson Cook material model, the composite damage material model based on the Chang-Chang criteria, and the crushable foam material model are used to model the aluminium sheets, composite plies and the AL foam respectively. Three types of contact algorithms, i.e. the erosion contact type, the tie-break contact type and the general 3D contact type are employed to define the various contacts during the Impact and to model the delamination between the FML layers and debonding between the FML skin and the AL foam. The finite element model is validated by comparing the simulated Impact Behaviour to that from experimental for a sandwich panel subjected to high speed Impact and demonstrated to be effective and accurate. The effect of the shape of projectile and Impact angle on the Impact Behaviour of the sandwich panels is studied using the developed finite element model. The research findings are summarized and concluded finally.
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high velocity Impact Behaviour of hybrid fiber engineered cementitious composite panels
Advanced Materials Research, 2012Co-Authors: Joel Bell, Y.-x. Zhang, Khin Soe, Phillip HermesAbstract:High-velocity Impact Behaviour of hybrid-fibre engineered cementitious composite (ECC) panels subjected to an Impact from a hardened steel, ogive-nosed projectile at velocities between 300-700 m/s is investigated and reported in this paper. The new ECC mix contains a proportion of 0.75% volume high-modulus steel fibres and 1.25% volume low modulus polyvinyl-alcohol (PVA) fibres. The mix is designed to achieve a desired balance between the strain hardening Behaviour and Impact resistance of material required for Impact and blast resistant structures. The new hybrid-fibre ECC demonstrates its excellent capability for Impact resistance and strong potential as a protective material with reduced Impact damage and distributed micro cracking.
Luigi Sorrentino - One of the best experts on this subject based on the ideXlab platform.
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the role of interface strength on the low velocity Impact Behaviour of pp glass fibre laminates
Composites Part B-engineering, 2014Co-Authors: Giorgio Simeoli, Carosena Meola, Domenico Acierno, Luigi Sorrentino, Salvatore Iannace, Pietro RussoAbstract:Abstract The low velocity Impact Behaviour of composites made of polypropylene (PP) as matrix and glass fibre fabric as reinforcement has been investigated. Two PP grades, differing for their melt flow index, have been used as matrix, and maleic anhydride has been used to manage the polymer/glass fibre interface strength. Impact tests at four energies (5, 20, 40 and 105 J) have been carried out to evaluate the main dissipation mechanisms occurring in each Impact condition and to identify the role of the interface strength. Quasi-static flexural tests confirmed that the compatibilizer improves both flexural modulus and strength, as well as strain at yield. A different performance trend is shown by low velocity Impact tests. Not compatibilized samples have exhibited, since the lowest Impact energy (5 J), significant energy dissipation resulting from the interface failure occurring at very low strains, as confirmed by lock-in thermographic analysis. Conversely, compatibilized samples showed no or small damages. As the Impact energy increases not compatibilized samples outperformed compatibilized samples by large margins showing better Impact resistance. This result has been related to the large energy dissipation occurring at the polymer/fibre interface. Furthermore, the broad interface failure and slipping act as crack blocker, preserving the integrity of fibres and allowing for higher load bearing. Managing the interface strength can be a viable option to design thermoplastic based composites with improved Impact damage tolerance and balanced quasi-static properties.
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drop weight Impact Behaviour of woven hybrid basalt carbon epoxy composites
Composites Part B-engineering, 2014Co-Authors: Fabrizio Sarasini, Salvatore Iannace, Jacopo Tirillo, L Ferrante, Marco Valente, T Valente, Luca Lampani, Paolo Gaudenzi, Salvatore Cioffi, Luigi SorrentinoAbstract:Abstract This study addresses the effects of basalt fibre hybridization on quasi-static mechanical properties and low velocity Impact Behaviour of carbon/epoxy laminates. Interply hybrid specimens with two different stacking sequences (sandwich-like and intercalated) are tested at three different energies, namely 5, 12.5 and 25 J. Residual post-Impact properties of the different configurations of carbon/basalt hybrid laminates are characterized by quasi static four point bending tests. Post-Impact flexural tests and interlaminar shear tests are used for the mechanical characterization along with two non-destructive methods, namely acoustic emission and ultrasonic phased array, in order to get further information on both the extent of damage and failure mechanisms. Results indicate that hybrid laminates with intercalated configuration (alternating sequence of basalt and carbon fabrics) have better Impact energy absorption capability and enhanced damage tolerance with respect to the all-carbon laminates, while hybrid laminates with sandwich-like configuration (seven carbon fabric layers at the centre of the laminate as core and three basalt fabric layers for each side of the composite as skins) present the most favourable flexural Behaviour.
Paolo Gaudenzi - One of the best experts on this subject based on the ideXlab platform.
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high velocity Impact Behaviour of hybrid basalt carbon epoxy composites
Composite Structures, 2017Co-Authors: Jacopo Tirillo, Fabrizio Sarasini, L Ferrante, T Valente, Luca Lampani, Ever J Barbero, S Sanchezsaez, Paolo GaudenziAbstract:Abstract The aim of this work is to investigate the effect of basalt fibre hybridization on carbon/epoxy laminates when subjected to high velocity Impacts. In this regard, interply hybrid specimens with four different stacking sequences (sandwich-like and intercalated structures) are tested and compared to non-hybrid reference laminates made of either only carbon or only basalt layers. The response to high velocity Impact tests is assessed through the evaluation of the Impact and residual velocities of the projectile and the ballistic limit, calculated using experimental data, is compared with the results given by an analytical model, showing a good agreement. The damage in composite laminates is investigated by destructive (optical microscopy) and non-destructive (ultrasonic phased array) techniques. As a result of basalt hybridization, the ballistic limits of all sandwich configurations are enhanced if compared to those of carbon laminates. Therefore the observed decrease of static mechanical properties of hybrid composites is largely compensated by improved response to Impact. Advantages also come in terms of cost saving, since the basalt fibre is far less expensive than the carbon one.
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drop weight Impact Behaviour of woven hybrid basalt carbon epoxy composites
Composites Part B-engineering, 2014Co-Authors: Fabrizio Sarasini, Salvatore Iannace, Jacopo Tirillo, L Ferrante, Marco Valente, T Valente, Luca Lampani, Paolo Gaudenzi, Salvatore Cioffi, Luigi SorrentinoAbstract:Abstract This study addresses the effects of basalt fibre hybridization on quasi-static mechanical properties and low velocity Impact Behaviour of carbon/epoxy laminates. Interply hybrid specimens with two different stacking sequences (sandwich-like and intercalated) are tested at three different energies, namely 5, 12.5 and 25 J. Residual post-Impact properties of the different configurations of carbon/basalt hybrid laminates are characterized by quasi static four point bending tests. Post-Impact flexural tests and interlaminar shear tests are used for the mechanical characterization along with two non-destructive methods, namely acoustic emission and ultrasonic phased array, in order to get further information on both the extent of damage and failure mechanisms. Results indicate that hybrid laminates with intercalated configuration (alternating sequence of basalt and carbon fabrics) have better Impact energy absorption capability and enhanced damage tolerance with respect to the all-carbon laminates, while hybrid laminates with sandwich-like configuration (seven carbon fabric layers at the centre of the laminate as core and three basalt fabric layers for each side of the composite as skins) present the most favourable flexural Behaviour.
Jon Aurrekoetxea - One of the best experts on this subject based on the ideXlab platform.
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Impact Behaviour of glass fibre reinforced epoxy aluminium fibre metal laminate manufactured by vacuum assisted resin transfer moulding
Composite Structures, 2016Co-Authors: Ortiz I De Mendibil, Mariasun Sarrionandia, L Aretxabaleta, Modesto Mateos, Jon AurrekoetxeaAbstract:Abstract Fibre Metal Laminates have been manufactured by liquid moulding. Flow paths have been drilled to enable the impregnation through the aluminium sheets. The effect of these holes on the low velocity Impact Behaviour has been studied. Damage mechanisms, dissipated energy and peak force of drilled samples have been compared to those of reference samples without holes. Results show that the presence of the holes has no effect on the performance of the plate and that the internal damage is confined to the surrounding of the Impact zone. When the holes are inside the Impact contact zone cracks in aluminium sheets propagate through the holes, but their effect is mitigated by the fibre bridging mechanism. Holes located out of the Impact contact zone have no effect in the damage mechanisms.
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Impact Behaviour of basalt fibre reinforced furan composites cured under microwave and thermal conditions
Composites Part B-engineering, 2014Co-Authors: Unai Lopez De Vergara, Koldo Gondra, Mariasun Sarrionandia, Jon AurrekoetxeaAbstract:Abstract Basalt fibre reinforced furan composites were successfully manufactured by microwave technology. The samples were tested under instrumented falling weight Impact loading and compared with conventionally cured ones. The microwave cured composites present higher values for ILLS (13.1%), delamination threshold force (5.2%), maximum load (17.8%) and penetration threshold (14.5%). The better Impact performance of microwave curing composites is suggested to be due to its lower residual stresses and more homogeneous crosslinking induced by mass volumetric heating.
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characterisation of the Impact Behaviour of polymer thermoplastics
Polymer Testing, 2005Co-Authors: L Aretxabaleta, Jon Aurrekoetxea, I Urrutibeascoa, Miguel SanchezsotoAbstract:Abstract One of the most important features when predicting the Impact response of plastic components is the characterisation of the material in Impact conditions. In this work, a new method to obtain stress/strain curves of thermoplastics at constant strain-rates is proposed. Instrumented tensile-Impact tests have been performed on polypropylene samples at different Impact energies. The use of tensile-Impact techniques avoids some problems associated with flexural Impact tests, and permits to determine the stress/strain curves and the strain-rate dependence of thermoplastics' Behaviour in Impact conditions. The results show that in the range of strain-rates analysed, polypropylene has an elastic–plastic Behaviour with a slight plastic strain hardening. The isostrain-rate stress/strain curves can be used as material data in finite element simulations of Impact events.
Fabrizio Sarasini - One of the best experts on this subject based on the ideXlab platform.
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high velocity Impact Behaviour of hybrid basalt carbon epoxy composites
Composite Structures, 2017Co-Authors: Jacopo Tirillo, Fabrizio Sarasini, L Ferrante, T Valente, Luca Lampani, Ever J Barbero, S Sanchezsaez, Paolo GaudenziAbstract:Abstract The aim of this work is to investigate the effect of basalt fibre hybridization on carbon/epoxy laminates when subjected to high velocity Impacts. In this regard, interply hybrid specimens with four different stacking sequences (sandwich-like and intercalated structures) are tested and compared to non-hybrid reference laminates made of either only carbon or only basalt layers. The response to high velocity Impact tests is assessed through the evaluation of the Impact and residual velocities of the projectile and the ballistic limit, calculated using experimental data, is compared with the results given by an analytical model, showing a good agreement. The damage in composite laminates is investigated by destructive (optical microscopy) and non-destructive (ultrasonic phased array) techniques. As a result of basalt hybridization, the ballistic limits of all sandwich configurations are enhanced if compared to those of carbon laminates. Therefore the observed decrease of static mechanical properties of hybrid composites is largely compensated by improved response to Impact. Advantages also come in terms of cost saving, since the basalt fibre is far less expensive than the carbon one.
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drop weight Impact Behaviour of woven hybrid basalt carbon epoxy composites
Composites Part B-engineering, 2014Co-Authors: Fabrizio Sarasini, Salvatore Iannace, Jacopo Tirillo, L Ferrante, Marco Valente, T Valente, Luca Lampani, Paolo Gaudenzi, Salvatore Cioffi, Luigi SorrentinoAbstract:Abstract This study addresses the effects of basalt fibre hybridization on quasi-static mechanical properties and low velocity Impact Behaviour of carbon/epoxy laminates. Interply hybrid specimens with two different stacking sequences (sandwich-like and intercalated) are tested at three different energies, namely 5, 12.5 and 25 J. Residual post-Impact properties of the different configurations of carbon/basalt hybrid laminates are characterized by quasi static four point bending tests. Post-Impact flexural tests and interlaminar shear tests are used for the mechanical characterization along with two non-destructive methods, namely acoustic emission and ultrasonic phased array, in order to get further information on both the extent of damage and failure mechanisms. Results indicate that hybrid laminates with intercalated configuration (alternating sequence of basalt and carbon fabrics) have better Impact energy absorption capability and enhanced damage tolerance with respect to the all-carbon laminates, while hybrid laminates with sandwich-like configuration (seven carbon fabric layers at the centre of the laminate as core and three basalt fabric layers for each side of the composite as skins) present the most favourable flexural Behaviour.
