The Ways to Develop Steel Reinforcing and Concrete Cohesion Testings

2018 ◽  
Vol 931 ◽  
pp. 624-627
Author(s):  
Lyubov V. Morgun ◽  
Anton V. Visnap ◽  
Vladimir N. Morgun
Keyword(s):  
Corrosion Resistance ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Experimental Evaluation ◽  
Strength Assessment ◽  
Real Nature ◽  
Reinforced Polymer ◽  
Deformation Properties ◽  
Strength And Deformation ◽  
Compatibility Of Materials

The article oversees the topicality of an appropriate strength assessment of bonding of steel reinforcing rod with concrete. It is shown that in the technology of reinforcing concrete framing, metal reinforcing has seen a new alternative in the form of fiberglass, basalt plastic reinforced polymer and carbon fiber. Efficiency of application of reinforcing construction made of composite materials includes not only increased corrosion resistance, but also better compatibility of materials in strength and deformation properties. The article suggests experimental evaluation of the adhesion of the steel reinforcing with concrete to account for its real nature.

Composite Materials for Hybrid Aerospace Gears

2020 ◽  
Vol 65 (4) ◽  
pp. 1-11
Author(s):  
Matthew D. Waller ◽  
Sean M. McIntyre ◽  
Kevin L. Koudela
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Power Transmission ◽  
Fiber Reinforced Polymer ◽  
Thermal Testing ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Hybrid Laminates ◽  
Steel Composite ◽  
Bismaleimide Resins

Hybrid steel-composite gears, which combine steel teeth with a fiber-reinforced polymer composite core, are a rapidly emerging technology for weight reduction in aerospace drivetrain systems. However, power transmission gears—and especially the requirement of rotorcraft gearboxes to operate under loss of lubrication—are a very challenging application for composite materials, due to the combination of mechanical and thermal loads. In this work, composite materials, including newly developed hybrid laminates featuring multiple grades of carbon fiber, are fabricated. Mechanical and thermal testing, along with ply-level finite element analysis, are employed to assess the suitability of these composite materials for hybrid aerospace gear applications. Particular focus is given to high-temperature epoxy and bismaleimide resins and to hybrid laminates reinforced by multiple grades of carbon fiber. This hybrid drivetrain technology would manifest significant weight reductions without compromising gear performance.

Investigation of crevice corrosion of metallic fastened joints in carbon fiber reinforced polymer (CFRP) exposed to coastal seawater

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mohammed I. Abdulsalam ◽  
Francisco Presuel-Moreno
Keyword(s):  
Corrosion Resistance ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Crevice Corrosion ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Content Type ◽  
Coastal Seawater ◽  
High Impedance ◽  
Reinforced Polymer

Purpose The purpose of this paper is to study the susceptibility of these three commonly used corrosion resistance fasteners in seawater. For a more practical scenario, a local Atlantic coastal seawater as received was used. Design/methodology/approach Carbon fiber reinforced polymer (CFRP) was fabricated with T700 carbon fiber (Toray Inc.) and VE8084 vinyl ester resin (Ashland) to make a unidirectional composite panel of thickness 1.8 mm. A conductive paint was applied to one of the sample edges that was perpendicular to the fiber direction, providing an electrical contact with carbon fibers to connect a copper wire. This external electric connection was used for potential measurements of both the open circuit potential (OCP) of the CFRP sample, and the mixed potential of the fastened set: consisting of the CFRP and the metallic fastener fastened to it. Three common fastener alloys were selected: 316SS, Monel and Titanium. For this purpose, a high impedance voltmeter was used in conjunction with a saturated calomel reference electrode. Measurements were taken daily. For longer time measurements, a four-channel high impedance analog data logger was used with 30 min sampling rate. Findings For both 316SS and Monel fastened sets, crevice corrosion occurred inside the occluded regions of the set, when immersed in coastal seawater. The attack was more severe for 316 stainless steel set. An isolated island attack of faceted surfaces morphology was seen for 316SS set. While, a circular ring of preferential grain boundary attack appeared for Monel set, indicating an IR (voltage) drop mechanism is more likely operating. Titanium-fastened sets showed high resistance to crevice corrosion when simmered in seawater. However, for long-time exposure, the sets became more susceptible to crevice corrosion attack supported by CFRP attachment (oxygen reduction reaction taking place at the carbon fibers). Originality/value Evidently, titanium, stainless steels and Monel are good candidates for galvanic corrosion resistance. However, their susceptibility to crevice corrosion when coupled with CFRP is a new challenging topic that needs further investigation. This is very important today because the vast application witnessed for CFRP material. This work involves developing an original methodology for this kind of investigation and was done at advanced laboratories of SeaTech at Florida Atlantic University by the Atlantic coastline.

Evaluating the Mechanical Properties of Carbon Fiber Reinforced Polymer Matrix Composite Materials at Room and Elevated Temperatures

2012 ◽  
Author(s):  
Mahdi Farahikia ◽  
Sunilbhai Macwan ◽  
Fereidoon Delfanian ◽  
Zhong Hu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Room Temperature ◽  
Polymer Matrix Composite ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Shear Tests ◽  
Reinforced Polymer

A series of tensile, compression and shear tests in room temperature were carried out on carbon fiber reinforced polymer matrix composite materials (IM7/PEEKEK) to evaluate their mechanical properties. Also tensile tests at 160 degrees Fahrenheit (72 degrees Celsius) in longitudinal and transverse directions were done to study the effects of such temperature on the tensile strength of the mentioned composite materials. The setup of the testing equipment and the furnace that was used to provide elevated temperature conditions limited the possibility of conducting compressive and shear tests at high temperature as well as raising the temperature to higher levels. The experiments were set up in accordance with ASTM standards that best corresponded to the test specifications. Specimens were categorized into groups according to their nature of testing. All the specimens were reinforced at both ends by means of tabs which were bonded on both faces to reduce the effects of the external pressure exerted on them through the grips of the testing machines and were tested until failure. Load, elongation (displacement) and strain data were recorded by means of strain gages and data acquisition systems. The accuracy of the experimental data for the room temperature portion of the experiments is verified by comparing them to those of the most equivalent composite family, as having not been given any information regarding the structural properties and manufacturing processes of the composite materials that were used throughout the experiments made it difficult to find exact ASTM standards and reference materials for the testing and comparison of results. The results of the experiments showed that the tensile strength of this particular composite material is not effected by the 160 degrees Fahrenheit temperature; a point that is proved by the literature indicating their specific and sensitive application in aircraft heat dissipation [1].

scholarly journals TECHNOLOGICAL-STRUCTURAL PECULIARITIES OF REINFORCED CONCRETE STRUCTURES STRENGTHENED WITH CARBON FIBER-REINFORCED POLYMER

2006 ◽  
Vol 12 (2) ◽  
pp. 77-83 ◽  
Author(s):  
Juozas Valivonis ◽  
Gediminas Marčiukaitis
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Reinforced Concrete Structures ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Deformation Properties ◽  
Carbon Fiber Reinforced

Carbon fiber‐reinforced polymer is used for strengthening of reinforced concrete structures with externally bonded reinforcement. This fiber has more strength and better deformation properties than steel. During glueing, the glue is absorbed in the surface layer of concrete. It changes physical and mechanical properties of concrete. This effect depends on the structure of concrete. Experimental investigations sustained absorbing of glue and strengthening of concrete. The rigidity between concrete and carbon fiber polymer layer is smaller in cracked zones. Shear deformations decrease rigidity and strength in a contact zone. The authors methods were investigated in fastening carbon fiber‐reinforced polymer to concrete. The efficiency of these methods was definited. Theoretical results are compared with experimental results.

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