scholarly journals An innovative tubular standing support incorporating PVC and FRP composites: laboratory tests

2021 ◽  
Author(s):  
Baisheng Zhang ◽  
Hongchao Zhao
Keyword(s):  
Weight Ratio ◽  
High Strength ◽  
Test Results ◽  
Compression Tests ◽  
Frp Composites ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Deformation Ability ◽  
Fibre Reinforced Polymer ◽  
Infill Material

Abstract With the depletion of shallow resources, the drawbacks of conventional bolting system in sustaining the integrity of the roadway have drawn much attention. Developing the innovative secondary standing support is therefore to be urgent. This paper presents a hybrid tubular standing support, which consists of an exterior container made of PVC and fibre-reinforced polymer (FRP) composites and the infill material made of coal rejects and high flowable cementitious grout material. Compared with other marketable standing support, the combination application of the large rupture strain PVC tube and the FRP composite with high strength-to-weight ratio can provide the effective confinement to infill material, which may result in the strain hardening behaviour. The use of coal reject to generate the backfill material is believed to be effective and thus is attractive from the design aspect. To verify these mentioned advantages, a series of compression tests were conducted on this FRP-PVC tubular standing support (FPTSS) with different thickness of the FRP jacket. In addition, the compression tests were also conducted to investigate the compressive behaviour of FRP tubular standing support (FTSS) and PVC tubular standing support (PTSS). Test results indicated that the combination of FRP and PVC composite achieve the superior behaviour either in terms of the compressive strength or the deformation ability.

scholarly journals Sequential Laser–Mechanical Drilling of Thick Carbon Fibre Reinforced Polymer Composites (CFRP) for Industrial Applications

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2136
Author(s):  
Sharizal Ahmad Sobri ◽  
Robert Heinemann ◽  
David Whitehead
Keyword(s):  
Carbon Fibre ◽  
Polymer Composites ◽  
Weight Ratio ◽  
High Strength ◽  
Industrial Applications ◽  
Fibre Laser ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Thrust And Torque

Carbon fibre reinforced polymer composites (CFRPs) can be costly to manufacture, but they are typically used anywhere a high strength-to-weight ratio and a high steadiness (rigidity) are needed in many industrial applications, particularly in aerospace. Drilling composites with a laser tends to be a feasible method since one of the composite phases is often in the form of a polymer, and polymers in general have a very high absorption coefficient for infrared radiation. The feasibility of sequential laser–mechanical drilling for a thick CFRP is discussed in this article. A 1 kW fibre laser was chosen as a pre-drilling instrument (or initial stage), and mechanical drilling was the final step. The sequential drilling method dropped the overall thrust and torque by an average of 61%, which greatly increased the productivity and reduced the mechanical stress on the cutting tool while also increasing the lifespan of the bit. The sequential drilling (i.e., laser 8 mm and mechanical 8 mm) for both drill bits (i.e., 2- and 3-flute uncoated tungsten carbide) and the laser pre-drilling techniques has demonstrated the highest delamination factor (SFDSR) ratios. A new laser–mechanical sequence drilling technique is thus established, assessed, and tested when thick CFRP composites are drilled.

The all-composite road bridge – a proposal for rapid urbanisation

2018 ◽  
Author(s):  
Tomasz Siwowski ◽  
Aleksander Kozlowski ◽  
Leonard Ziemiański ◽  
Mateusz Rajchel ◽  
Damian Kaleta
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Construction Materials ◽  
Fast Growing ◽  
Frp Composites ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Composite Bridge ◽  
Fibre Reinforced Polymer ◽  
Traditional Construction

<p>Technology and materials can help cities get smarter and cope with rapid urbanisation. Life cycle assessment (LCA) is one of the approaches applied in evaluation of material sustainability. Many significant LCA comparisons of innovative and traditional construction materials indicate that fibre- reinforced polymer (FRP) composites compare very favourably with other materials studied. As a proposal for rapid urbanisation, the FRP all-composite road bridge was developed and demonstrated in Poland. The paper describes the bridge system itself and presents the results of research on its development. The output of the R&amp;D project gives a very promising future for the FRP composite bridge application in Poland, especially for cleaner, resilient and more environmentally efficient infrastructure of fast-growing cities.</p>

scholarly journals Numerical Modeling of GFRP Reinforced Concrete Slabs

2017 ◽  
Vol 1 (4) ◽  
Author(s):  
Omer R EL Zaroug, John P Forth, Jianqiao YE
Keyword(s):  
Finite Element ◽  
Mechanical Load ◽  
Weight Ratio ◽  
High Strength ◽  
Load Range ◽  
Finite Element Program ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Element Program ◽  
Fibre Reinforced Polymer

The use of non-metallic fibre reinforced polymer reinforcement as an alternative to steel reinforcement in concrete is gaining acceptance mainly due to its high corrosion resistance. High strength-to-weight ratio, high stiffness-to-weight ratio and ease of handling and fabrication are added advantages. Other benefits are that they do not influence to magnetic fields and radio frequencies and they are thermally non-conductive. However, the stress-strain relationship for Glass fibre reinforced polymer reinforcement (GFRP) is linear up to rupture when the ultimate strength is reached. Unlike steel reinforcing bars, GFRP rebars do not undergo yield deformation or strain hardening before rupture. Also, GFRP reinforcement possesses a relatively low elastic modulus of elasticity compared with that of steel. As a consequence, for GFRP reinforced sections, larger deflections and crack widths are expected than the ones obtained from equivalent steel reinforced sections for the same load. This investigation provides details of the numerical analysis of GFRP reinforced slabs loaded mechanically using the commercial finite element program (DIANA). To prove the validity of the proposed finite element approach, a comparison is made with experimental test results obtained from full-size slabs. The comparisons are made on the basis of first cracking load, load-deflection response at midspan, cracking patterns, mode of failure and loads at failure. Using the DIANA software for the analysis of GFRP reinforced slabs under mechanical load is possible and can produce acceptable predictions throughout the load range in terms of final load and crack patterns. However, DIANA overestimated the first cracking load and tended to over predict the experimental deflections.  

scholarly journals Modelling and Validation of the Composite Shell of a Train Seat

2020 ◽  
Vol 64 (189) ◽  
pp. 75-84
Author(s):  
Łukasz Gołębiowski ◽  
Marcin Siwek ◽  
Marcin Ciesielski ◽  
Andrzej Zagórski ◽  
Sławomir Krauze ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Composite Shell ◽  
Strength Analysis ◽  
Material Structure ◽  
Frp Composites ◽  
Frp Composite ◽  
Industry Standard ◽  
Reinforced Polymer ◽  
Physical Prototype ◽  
Fibre Reinforced Polymer

The subject of the modelling work and the conducted experiments is the composite shell of a train seat. The activities carried out involved designing the geometry, planning the material structure, and selecting the materials to be used. The shell was built using polymer matrix fibrous composites (i.e. FRP – Fibre Reinforced Polymer – composites), which are lighter than steel and comply with the relevant standards for strength and safety at the same time. This was followed by creating a computational model for the shell and conducting a strength analysis in accordance with the guidelines of the relevant industry standard and strength hypotheses adopted for FRP composites. The calculations were conducted using ANSYS Composite PrepPost software based on the finite element method. The article offers a strength analysis of an optimised composite shell of a train seat. Based on the guidelines obtained as a result of the conducted modelling work, a physical prototype (validation model) of the seat was created. Hot vacuum lamination technology was applied in the production process. The experimental validation of the model, producing a positive result, was conducted using a test stand owned by S.Z.T.K. TAPS – Maciej Kowalski. Keywords: train seat structure, FRP composite, FEM modelling, experimental validation

Reinforcing Fibre Reinforced Polymer Bridge Decks with Steel Rods

2016 ◽  
Vol 708 ◽  
pp. 64-69
Author(s):  
Mehmet Alpaslan Köroğlu ◽  
Yunus Dere
Keyword(s):  
Bridge Decks ◽  
High Strength ◽  
Fe Analysis ◽  
Fe Model ◽  
Bond Slip ◽  
Shell Elements ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Existing Bridges

Fibre reinforced polymer (FRP) bridge decks have become an innovative alternative and they have offered many advantages and this has been increasing attention for applications in not only reinforcement of existing bridges decks but also construction of new bridges decks. The advantages of these FRP decks are; lightweight, high-strength FRP materials, corrosion resistance. However, this high strength deck is not ductile. In this study, the behaviour of hybrid FRP-steel decks are investigated. All FRP decks was analysed with the commercial package ABAQUS. In the FE model, the webs and flanges were discretised by 4 nodes shell elements. A full composite action between the steel and the FRP composite was assumed in the FE analysis because the bond-slip behaviour was unknown at that time. The performance of the proposed hybrid FRP deck panel was evaluated by means of FE analysis.

scholarly journals Impact Properties of Hybrid Fibre Reinforced Polymer Composite Laminates

2020 ◽  
Vol 9 (3) ◽  
pp. 2763-2766
Keyword(s):  
Composite Laminates ◽  
Composite Laminate ◽  
High Strength ◽  
Peak Force ◽  
Pressing Method ◽  
Impact Properties ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
The Impact

The increasing demand for high-strength light-weight fibre reinforced polymer (FRP) composite materials has driven the researchers to further innovate and introduce hybrid reinforcement materials. The usage of hybrid FRP composite laminates in structural industries is still new and limited research has been reported in this area. Thus, this research is aimed to determine the impact properties of hybrid FRP composite laminate. The impact tests were carried out on three types of FRP composite laminates, i.e. Carbon, Glass and Hybrid, in order to determine the impact properties of the materials. The composite laminates were prepared using hot pressing method. It was found that the hybrid FRP composite laminate exhibited better impact properties with 13% higher specific energy absorption when compared to the neat carbon FRP composite laminate. The impact test on hybrid FRP composite laminate recorded higher peak force, deflection at peak force and energy absorbed values of 109%, 71% and 25% respectively, when compared to the neat CFRP composite laminate.

Investigation of CFRP- and GFRP-confined concrete cylinders under monotonic and cyclic loading

2014 ◽  
Vol 21 (4) ◽  
pp. 607-614 ◽  
Author(s):  
Ali A. Mortazavi ◽  
Mostafa Jalal
Keyword(s):  
Cyclic Loading ◽  
Axial Strain ◽  
Glass Fibers ◽  
Weight Ratio ◽  
High Strength ◽  
Confined Concrete ◽  
Strain Behavior ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Concrete Cylinders

AbstractFiber reinforced polymer (FRP) composites have found increasingly wide applications in engineering due to their high strength-to-weight ratio and high corrosion resistance. One important application of FRP composites is as a confining material for concrete, which can enhance both the compressive strength and the ultimate axial strain of concrete. With this respect, the stress-strain behavior of FRP-confined concrete, under both monotonic and cyclic compression, needs to be properly understood and modeled. This paper presents details of an experimental work carried out on concrete cylinders wrapped with FRP materials and subjected to both monotonic and cyclic loading. A total number of 12 FRP confined concrete specimens and 10 control specimens with a diameter of 100 mm and a height of 200 mm were cast and cured under the same conditions, and two FRP materials (carbon fibers (CFRP) and glass fibers (GFRP)) were used for the construction of the FRP jackets. The effect of the type of confinement material, reinforcement ratio based on the jacket stiffness, and type of loading is examined. A model that predicts the behavior of confined concrete, which takes into account the stiffness and effectiveness of different confinement materials is also briefly introduced.

Critical Thrust Force for On-Set Delamination of Hybrid FRP Composite during Drilling Process

2017 ◽  
Vol 740 ◽  
pp. 111-117 ◽  
Author(s):  
Chye Lih Tan ◽  
Azwan Iskandar Azmi ◽  
Noorhafiza Muhammad
Keyword(s):  
Thrust Force ◽  
Dimensional Accuracy ◽  
Limiting Factor ◽  
Drilling Process ◽  
Frp Composites ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Hybrid Fibre ◽  
Fibre Reinforced Polymer ◽  
Critical Thrust Force

Hole quality is one of the important criteria for hybrid composite components when assessing drilling behaviour because it influences the strength of composite parts post assembly. Nonetheless, some unique characteristics of hybrid Fibre-Reinforced Polymer (FRP) composites make them difficult to obtain the required quality and strict final dimensional accuracy. Based on previous studies, delamination has been recognized as one of the critical failure mechanisms in the drilling operation of FRP composites. It can often be the limiting factor for the final composite materials applications. Thus, in order to achieve a delamination-free in the drilling of hybrid FRP composites, an analytical model and a series of thrust force experiments are endeavoured in this study. The main purpose of the model is to compute the critical thrust force at the on-set of delamination during the drilling process. Results of this analytical study indicated that the delamination damage can be alleviated if the applied thrust force is lower than the critical thrust force value. Importantly, a good agreement was evident between the estimated critical thrust force and the measured thrust force in this particular study.

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