The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Syed Minhaj Saleem Kazmi - One of the best experts on this subject based on the ideXlab platform.
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axial stress strain behavior of macro Synthetic Fiber reinforced recycled aggregate concrete
Cement & Concrete Composites, 2019Co-Authors: Syed Minhaj Saleem Kazmi, Muhammad Junaid Munir, Indubhushan Patnaikuni, Yingwu Zhou, Feng XingAbstract:Abstract This study aims to investigate the axial stress-strain behavior of macro-Synthetic Fiber reinforced recycled aggregate concrete. Concrete cylinders reinforced with macro-Synthetic Fibers were tested under axial compression, with the variation of three different replacement ratios of recycled aggregates (i.e., 0, 50 and 100%) and three different dosages of macro polypropylene Fibers (i.e., 0, 0.5 and 1% of volume of recycled aggregate concrete). A comparative study of the existing stress-strain models for steel Fiber reinforced normal and recycled aggregate concrete with the test results indicates that the stress-strain behavior of steel Fiber reinforced normal and recycled aggregate concrete can be well predicted by these existing models. No stress-strain model for macro-Synthetic Fiber reinforced normal and recycled aggregate concrete has been developed. Based on the test results, a stress-strain model is developed in this work by modifying the parameters of best performing stress-strain model for steel Fiber reinforced normal aggregate concrete. The proposed model can effectively predict the stress-strain behavior of both steel and macro-Synthetic Fiber reinforced normal and recycled aggregate concrete. Test results show that the peak stress, peak strain and ultimate strain of concrete specimens increase with the increase in Fiber dosage and the addition of Fibers has a better effect on recycled aggregate concrete and as compared to normal aggregate concrete.
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Effect of macro-Synthetic Fibers on the fracture energy and mechanical behavior of recycled aggregate concrete
Construction and Building Materials, 2018Co-Authors: Syed Minhaj Saleem Kazmi, Muhammad Junaid Munir, Indubhushan PatnaikuniAbstract:Abstract In order to achieve sustainability in construction industry, recycling of construction and demolition wastes in new concrete is gaining a lot of attention. However, extensive research is needed to explore the complete behavior of resulting recycled aggregate concrete (RAC). This study aims to investigate the fracture behavior, mechanical performance and microstructure of macro-Synthetic Fiber reinforced RAC. For this purpose, notched beam specimens were produced using three different replacement ratios of recycled concrete aggregates (RCA) (i.e., 0, 50% and 100%) and three different dosages of macro-Synthetic Fibers (i.e., 0, 0.5% and 1% of volume of RAC). Three-point bending and other mechanical tests were performed to investigate the post peak behavior (residual flexural tensile strength, fracture energy and toughness) and mechanical properties (compressive strength, flexural strength and split tensile strength) of macro-Synthetic Fiber reinforced normal and RAC. Fracture surface analysis was also performed to develop the empirical relationships between number of Fibers and post peak behavior of Fiber reinforced RAC. Furthermore, microstructure characteristics of macro-Synthetic Fiber reinforced normal and RAC were also investigated using scanning electron microscopy (SEM). Results showed that reduction in mechanical properties of concrete was observed with the increase in RCA replacement ratio. However, increase in mechanical properties particularly split tensile strength of normal and RAC was observed with the increase in dosage of macro-Synthetic Fibers. Concrete specimens also showed increase in residual flexural tensile strengths with the increase in dosage of macro-Synthetic Fibers. RAC reinforced with 1% dosage of macro-Synthetic Fibers showed increase in fracture energy and toughness by 380% and 129%, respectively. A strong influence of number of Fibers on residual flexural tensile strength and fracture energy of concrete mixtures was observed during the study. Microstructural analysis also showed the existence of bond between mortar paste and macro-Synthetic Fiber, which improved the mechanical properties and post peak behavior of macro-Synthetic Fiber reinforced concrete. Based on this study, it can be concluded that macro-Synthetic Fibers improve the fracture energy and mechanical properties of RAC leading towards higher ductility and better energy dissipation. Moreover, number of Fibers strongly influences the residual flexural tensile strength and fracture energy of RAC.
Stephen J. Banfield - One of the best experts on this subject based on the ideXlab platform.
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A review of Synthetic Fiber moorings for marine energy applications
5th International Conference on Ocean Energy, 2014Co-Authors: Peter Davies, Sam D Weller, Lars Johanning, Stephen J. BanfieldAbstract:Many marine renewable energy (MRE) conversion systems including wave, floating wind, Ocean Thermal Energy Conversion (OTEC) and some tidal energy devices, are moored in place. The choice of mooring system is critical as it directly affects installation, energy take-off, and long term reliability, and hence has a significant influence on costs. Installation has been estimated to account for 27% of lifetime cost for a tidal turbine [1]. This is an area where the other marine industries, notably offshore oil and gas, have extensive experience, but the high energy regions in which MRE devices are deployed pose particular installation difficulties and operating conditions. There has been a strong movement towards replacing steel with Synthetic Fiber ropes offshore in recent years, particularly in deep water off Brazil and in the Gulf of Mexico [2,3]. Lightweight materials can simplify handling and reduce vessel and crane size but this is not the prime mover towards Synthetic Fiber moorings for marine energy. The main arguments are the possibility to adapt the mooring to the large movements of floating devices, using rope compliance to reduce peak loads while minimizing energy loss, and reduced cost. This requires both a detailed knowledge of the material options and design tools which can optimize stiffness, strength, damping and long term behavior. The large range of Fibers and rope constructions available offers extensive possibilities for tailoring the mooring to the response of the device and maximizing energy recovery.
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The prediction of cyclic load behaviour and modulus modulation for polyester and other large Synthetic Fiber ropes
Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492), 2003Co-Authors: C.m. Leech, Stephen J. Banfield, M. LemoelAbstract:Fibre Rope Modeller (FRM) is a computer program for the analysis and prediction of Synthetic Fiber rope behaviour. It calculates the static tension-extension and torque-twist behaviour of fibre ropes using the basic fibre or yarn properties and the rope constructional parameters. It accounts for internal friction, internal polymer heating and material abrasion and fatigue to predict rope performance and life. This paper outlines the modulus modeling modifications recently made to FRM and describes how cyclic loading and its consequences are implemented into FRM. This paper also describes how the program has been validated using data from cyclic loading tests. A full assessment of rope axial stiffness must include the effects of cyclic loading. Cyclic tension generates loops in the rope tension-extension plot. The area enclosed in these loops represents work done on the rope, and results in damping and hysteresis. For polyester ropes these loops do not follow the static tension-extension curve but a steeper curve; the analogy for this steeper curve is the unloading curve for post yield loading of steel. This steeper curve results in axial stiffening or modulus modulation, which produces a higher rope modulus than predicted by the static model. FRM has been enhanced to use these material properties and to predict their effect on rope behaviour. These improvements now enable FRM to predict hysteretic damping, modulus stiffening and rope set caused by polymer residual strain. Further recent enhancements include the modelling of plaited and braided ropes, distortion and dilation of rope diameter due to bedding-in and creep strain.
Peter Davies - One of the best experts on this subject based on the ideXlab platform.
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A review of Synthetic Fiber moorings for marine energy applications
5th International Conference on Ocean Energy, 2014Co-Authors: Peter Davies, Sam D Weller, Lars Johanning, Stephen J. BanfieldAbstract:Many marine renewable energy (MRE) conversion systems including wave, floating wind, Ocean Thermal Energy Conversion (OTEC) and some tidal energy devices, are moored in place. The choice of mooring system is critical as it directly affects installation, energy take-off, and long term reliability, and hence has a significant influence on costs. Installation has been estimated to account for 27% of lifetime cost for a tidal turbine [1]. This is an area where the other marine industries, notably offshore oil and gas, have extensive experience, but the high energy regions in which MRE devices are deployed pose particular installation difficulties and operating conditions. There has been a strong movement towards replacing steel with Synthetic Fiber ropes offshore in recent years, particularly in deep water off Brazil and in the Gulf of Mexico [2,3]. Lightweight materials can simplify handling and reduce vessel and crane size but this is not the prime mover towards Synthetic Fiber moorings for marine energy. The main arguments are the possibility to adapt the mooring to the large movements of floating devices, using rope compliance to reduce peak loads while minimizing energy loss, and reduced cost. This requires both a detailed knowledge of the material options and design tools which can optimize stiffness, strength, damping and long term behavior. The large range of Fibers and rope constructions available offers extensive possibilities for tailoring the mooring to the response of the device and maximizing energy recovery.
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analytical modeling of Synthetic Fiber ropes part ii a linear elastic model for 1 6 fibrous structures
International Journal of Solids and Structures, 2007Co-Authors: Seyed Reza Ghoreishi, Peter Davies, Patrice Cartraud, Tanguy MessagerAbstract:Abstract In part I of this study it was shown that, to model Synthetic Fiber ropes, two scale transition models can be used in sequence. The first model (continuum model) has been presented in the part I and the present paper examines the behavior of a fibrous structure consisting of 6 helicoidal strands around a central core (1 + 6 structure). An analytical model will be presented which enables the global elastic behavior of such a cable under tension–torsion loading to be predicted. In this model, first, the core and the strands are described as Kirchhoff–Love beams and then the traction–torsion coupling behavior is taken into account for both of them. By modeling the contact conditions between the strands and the core, with certain assumptions, it is possible to describe the behavior of the cable section as a function of the degrees of freedom of the core. The behavior of the cable can thus be deduced from the tension–torsion coupling behavior of its constituents. Tensile tests have been performed on the core, the strands and then on a full scale 205 ton failure load cable. Finally, predicted stiffness from the analytical models is compared to the test results.
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Analytical modeling of Synthetic Fiber ropes subjected to axial loads. Part I: A new continuum model for multilayered fibrous structures
International Journal of Solids and Structures, 2007Co-Authors: Seyed Reza Ghoreishi, Peter Davies, Patrice Cartraud, Tanguy MessagerAbstract:Synthetic Fiber ropes are characterized by a very complex architecture and a hierarchical structure. Considering the Fiber rope architecture, to pass from Fiber to rope structure behavior, two scale transition models are necessary, used in sequence: one is devoted to an assembly of a large number of twisted components (multilayered), whereas the second is suitable for a structure with a central straight core and six helical wires (1 + 6). The part I of this paper first describes the development of a model for the static behavior of a fibrous structure with a large number of twisted components. Tests were then performed on two different structures subjected to axial loads. Using the model presented here the axial stiffness of the structures has been predicted and good agreement with measured values is obtained. A companion paper presents the second model to predict the mechanical behavior of a 1 + 6 fibrous structure.
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Analytical modeling of Synthetic Fiber ropes. Part II : A linear elastic model for 1 + 6 fibrous structures
International Journal of Solids and Structures, 2007Co-Authors: Seyed Reza Ghoreishi, Peter Davies, Patrice Cartraud, Tanguy MessagerAbstract:In part I of this study it was shown that, to model Synthetic Fiber ropes, two scale transition models can be used in sequence. The first model (continuum model) has been presented in the part I and the present paper examines the behavior of a fibrous structure consisting of 6 helicoidal strands around a central core (1 + 6 structure). An analytical model will be presented which enables the global elastic behavior of such a cable under tension-torsion loading to be predicted. In this model, first, the core and the strands are described as Kirchhoff-Love beams and then the traction-torsion coupling behavior is taken into account for both of them. By modeling the contact conditions between the strands and the core, with certain assumptions, it is possible to describe the behavior of the cable section as a function of the degrees of freedom of the core. The behavior of the cable can thus be deduced from the tension-torsion coupling behavior of its constituents. Tensile tests have beer, performed on the core, the strands and then on a full scale 205 ton failure load cable. Finally, predicted stiffness from the analytical models is compared to the test results.
Muhammad Junaid Munir - One of the best experts on this subject based on the ideXlab platform.
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axial stress strain behavior of macro Synthetic Fiber reinforced recycled aggregate concrete
Cement & Concrete Composites, 2019Co-Authors: Syed Minhaj Saleem Kazmi, Muhammad Junaid Munir, Indubhushan Patnaikuni, Yingwu Zhou, Feng XingAbstract:Abstract This study aims to investigate the axial stress-strain behavior of macro-Synthetic Fiber reinforced recycled aggregate concrete. Concrete cylinders reinforced with macro-Synthetic Fibers were tested under axial compression, with the variation of three different replacement ratios of recycled aggregates (i.e., 0, 50 and 100%) and three different dosages of macro polypropylene Fibers (i.e., 0, 0.5 and 1% of volume of recycled aggregate concrete). A comparative study of the existing stress-strain models for steel Fiber reinforced normal and recycled aggregate concrete with the test results indicates that the stress-strain behavior of steel Fiber reinforced normal and recycled aggregate concrete can be well predicted by these existing models. No stress-strain model for macro-Synthetic Fiber reinforced normal and recycled aggregate concrete has been developed. Based on the test results, a stress-strain model is developed in this work by modifying the parameters of best performing stress-strain model for steel Fiber reinforced normal aggregate concrete. The proposed model can effectively predict the stress-strain behavior of both steel and macro-Synthetic Fiber reinforced normal and recycled aggregate concrete. Test results show that the peak stress, peak strain and ultimate strain of concrete specimens increase with the increase in Fiber dosage and the addition of Fibers has a better effect on recycled aggregate concrete and as compared to normal aggregate concrete.
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Effect of macro-Synthetic Fibers on the fracture energy and mechanical behavior of recycled aggregate concrete
Construction and Building Materials, 2018Co-Authors: Syed Minhaj Saleem Kazmi, Muhammad Junaid Munir, Indubhushan PatnaikuniAbstract:Abstract In order to achieve sustainability in construction industry, recycling of construction and demolition wastes in new concrete is gaining a lot of attention. However, extensive research is needed to explore the complete behavior of resulting recycled aggregate concrete (RAC). This study aims to investigate the fracture behavior, mechanical performance and microstructure of macro-Synthetic Fiber reinforced RAC. For this purpose, notched beam specimens were produced using three different replacement ratios of recycled concrete aggregates (RCA) (i.e., 0, 50% and 100%) and three different dosages of macro-Synthetic Fibers (i.e., 0, 0.5% and 1% of volume of RAC). Three-point bending and other mechanical tests were performed to investigate the post peak behavior (residual flexural tensile strength, fracture energy and toughness) and mechanical properties (compressive strength, flexural strength and split tensile strength) of macro-Synthetic Fiber reinforced normal and RAC. Fracture surface analysis was also performed to develop the empirical relationships between number of Fibers and post peak behavior of Fiber reinforced RAC. Furthermore, microstructure characteristics of macro-Synthetic Fiber reinforced normal and RAC were also investigated using scanning electron microscopy (SEM). Results showed that reduction in mechanical properties of concrete was observed with the increase in RCA replacement ratio. However, increase in mechanical properties particularly split tensile strength of normal and RAC was observed with the increase in dosage of macro-Synthetic Fibers. Concrete specimens also showed increase in residual flexural tensile strengths with the increase in dosage of macro-Synthetic Fibers. RAC reinforced with 1% dosage of macro-Synthetic Fibers showed increase in fracture energy and toughness by 380% and 129%, respectively. A strong influence of number of Fibers on residual flexural tensile strength and fracture energy of concrete mixtures was observed during the study. Microstructural analysis also showed the existence of bond between mortar paste and macro-Synthetic Fiber, which improved the mechanical properties and post peak behavior of macro-Synthetic Fiber reinforced concrete. Based on this study, it can be concluded that macro-Synthetic Fibers improve the fracture energy and mechanical properties of RAC leading towards higher ductility and better energy dissipation. Moreover, number of Fibers strongly influences the residual flexural tensile strength and fracture energy of RAC.
Indubhushan Patnaikuni - One of the best experts on this subject based on the ideXlab platform.
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axial stress strain behavior of macro Synthetic Fiber reinforced recycled aggregate concrete
Cement & Concrete Composites, 2019Co-Authors: Syed Minhaj Saleem Kazmi, Muhammad Junaid Munir, Indubhushan Patnaikuni, Yingwu Zhou, Feng XingAbstract:Abstract This study aims to investigate the axial stress-strain behavior of macro-Synthetic Fiber reinforced recycled aggregate concrete. Concrete cylinders reinforced with macro-Synthetic Fibers were tested under axial compression, with the variation of three different replacement ratios of recycled aggregates (i.e., 0, 50 and 100%) and three different dosages of macro polypropylene Fibers (i.e., 0, 0.5 and 1% of volume of recycled aggregate concrete). A comparative study of the existing stress-strain models for steel Fiber reinforced normal and recycled aggregate concrete with the test results indicates that the stress-strain behavior of steel Fiber reinforced normal and recycled aggregate concrete can be well predicted by these existing models. No stress-strain model for macro-Synthetic Fiber reinforced normal and recycled aggregate concrete has been developed. Based on the test results, a stress-strain model is developed in this work by modifying the parameters of best performing stress-strain model for steel Fiber reinforced normal aggregate concrete. The proposed model can effectively predict the stress-strain behavior of both steel and macro-Synthetic Fiber reinforced normal and recycled aggregate concrete. Test results show that the peak stress, peak strain and ultimate strain of concrete specimens increase with the increase in Fiber dosage and the addition of Fibers has a better effect on recycled aggregate concrete and as compared to normal aggregate concrete.
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Effect of macro-Synthetic Fibers on the fracture energy and mechanical behavior of recycled aggregate concrete
Construction and Building Materials, 2018Co-Authors: Syed Minhaj Saleem Kazmi, Muhammad Junaid Munir, Indubhushan PatnaikuniAbstract:Abstract In order to achieve sustainability in construction industry, recycling of construction and demolition wastes in new concrete is gaining a lot of attention. However, extensive research is needed to explore the complete behavior of resulting recycled aggregate concrete (RAC). This study aims to investigate the fracture behavior, mechanical performance and microstructure of macro-Synthetic Fiber reinforced RAC. For this purpose, notched beam specimens were produced using three different replacement ratios of recycled concrete aggregates (RCA) (i.e., 0, 50% and 100%) and three different dosages of macro-Synthetic Fibers (i.e., 0, 0.5% and 1% of volume of RAC). Three-point bending and other mechanical tests were performed to investigate the post peak behavior (residual flexural tensile strength, fracture energy and toughness) and mechanical properties (compressive strength, flexural strength and split tensile strength) of macro-Synthetic Fiber reinforced normal and RAC. Fracture surface analysis was also performed to develop the empirical relationships between number of Fibers and post peak behavior of Fiber reinforced RAC. Furthermore, microstructure characteristics of macro-Synthetic Fiber reinforced normal and RAC were also investigated using scanning electron microscopy (SEM). Results showed that reduction in mechanical properties of concrete was observed with the increase in RCA replacement ratio. However, increase in mechanical properties particularly split tensile strength of normal and RAC was observed with the increase in dosage of macro-Synthetic Fibers. Concrete specimens also showed increase in residual flexural tensile strengths with the increase in dosage of macro-Synthetic Fibers. RAC reinforced with 1% dosage of macro-Synthetic Fibers showed increase in fracture energy and toughness by 380% and 129%, respectively. A strong influence of number of Fibers on residual flexural tensile strength and fracture energy of concrete mixtures was observed during the study. Microstructural analysis also showed the existence of bond between mortar paste and macro-Synthetic Fiber, which improved the mechanical properties and post peak behavior of macro-Synthetic Fiber reinforced concrete. Based on this study, it can be concluded that macro-Synthetic Fibers improve the fracture energy and mechanical properties of RAC leading towards higher ductility and better energy dissipation. Moreover, number of Fibers strongly influences the residual flexural tensile strength and fracture energy of RAC.
