Composite Materials for Repair of Pressure Boundary and Structural Components

2009 ◽  
Author(s):  
John A. Charest
Keyword(s):  
Composite Materials ◽  
New Technology ◽  
High Strength ◽  
Fiber Reinforced Polymers ◽  
Material Technology ◽  
Reinforced Polymers ◽  
Frp Reinforcement ◽  
Personnel Safety ◽  
The Cost ◽  
Host Component

Deterioration of components and structures at power generating facilities has caused unscheduled plant outages, personnel safety concerns, and significant impact on operating budgets. However, new technology is now available that can increase the usable life of components and structures, while significantly reducing the economic burden normally associated with repair or replacement options. This technology, known as “Fiber Reinforced Polymers” or FRP, primarily utilizes carbon fibers and high strength epoxy resins to restore or enhance the structural and or pressure boundary capacity of plant components. The extent of the FRP reinforcement is determined by the targeted equipment operating parameters, and the inter-action of the composite materials with the host component. These repairs are typically accomplished in-place with small crews and completed during a relatively short duration. The material technology and engineering associated with FRP repair methods provides an effective mechanism to rehabilitate piping, pumps, heat exchangers, water boxes, structural shapes and numerous other items while minimizing the cost typically associated with direct replacement. This paper will focus on typical applications, design and installation of FRP technology as it relates to maintenance activities at power generating facilities.

scholarly journals Effectivenes of Strengthening Loaded RC Beams with FRCM System

2018 ◽  
Vol 64 (3) ◽  
pp. 3-13 ◽  
Author(s):  
Z. Blikharskyy ◽  
K. Brózda ◽  
J. Selejdak
Keyword(s):  
Composite Materials ◽  
Concrete Beams ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymers ◽  
Rc Beams ◽  
Aramid Fibers ◽  
Reinforced Polymers ◽  
Existing Structures ◽  
Synthetic Matrix

AbstractThe composite materials as FRP (Fiber Reinforced Polymers), which are characterized by benefits resulting from the combination of high strength reinforcement (as carbon, glass, steel or aramid fibers) with synthetic matrix are increasingly used to reinforce existing structures. Reinforcing System as FRCM (Fibre Reinforced Cementitious Matrix), which includes, among others, Ruredil X Mesh Gold System, is much less commonly used. However, the uniform and practical methods for calculating composite reinforced structures are not determined. Especially when considering the real conditions of structure exploitation, which requires further research in this field. In the paper the initial loading level influence on the efficiency of reinforced concrete beams strengthen using system Ruredil X Mesh Gold was investigated.

Analysis of Technology and Economy for Steel Structure Reinforced with Carbon Fiber Sheets

2013 ◽  
Vol 351-352 ◽  
pp. 1432-1435
Author(s):  
Jing Wang
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Market Potential ◽  
Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Technology Advancement ◽  
Technical And Economic Analysis ◽  
Frp Reinforcement ◽  
Technology And Economy ◽  
The Cost

Fiber reinforced polymers (FRP) can be used to restore the stiffness and bearing capacity of the damaged steel structures and improve their fatigue resistance. The reinforcement technology has the advantages of fast construction, short cycle, environmental protection and can greatly reduce the cost of the projects. Because there is a large number of steel structure need reinforced in our country, the market potential is tremendous. With localization of FRP and technology advancement of material production, the reinforcement technology will have a stronger competitiveness. Combined with material properties, comprehensive cost, construction method, maintenance and other aspects of FRP, a comprehensive technical and economic analysis has been done for FRP reinforcement and repair technology of steel structure. It could be provided a theory basis and application reference for existing steel repair reinforcement technology.

First Evaluations on Structural Response of FRP Pultruded Applications Subjected to Seismic Actions

2014 ◽  
Vol 900 ◽  
pp. 449-454
Author(s):  
Giosuè Boscato
Keyword(s):  
New Technology ◽  
Structural Response ◽  
Independent Solution ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Seismic Behaviour ◽  
Reinforced Polymers ◽  
Historical Structures ◽  
Glass Fiber Reinforced ◽  
Innovative Solution

The present work proposes and analyses the solution for seismic behaviour of GFRP (Glass Fiber Reinforced Polymers) applications to evaluate the performances respect to dynamic actions considering the global effect on historical structures. The good strength-self-weight relationship defines the GFRP pultruded profile as an efficacious and innovative solution for structural rehabilitation of historical buildings. The composite material with polymeric matrix, FRP (Fiber Reinforced Polymers), is widely used in civil engineering as sheets, bars and strips. Recently a new technology was adopted to improve the structural response with limited increment of dead load with reversible and independent solution.

scholarly journals State-of-the-art of fiber-reinforced polymers in additive manufacturing technologies

2017 ◽  
Vol 36 (15) ◽  
pp. 1061-1073 ◽  
Author(s):  
Thomas Hofstätter ◽  
David B Pedersen ◽  
Guido Tosello ◽  
Hans N Hansen
Keyword(s):  
Additive Manufacturing ◽  
State Of The Art ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Material Technology ◽  
Reinforced Polymers ◽  
Recent Developments ◽  
Multiple Materials ◽  
Manufacturing Technologies ◽  
Fiber Reinforced Material

Additive manufacturing technologies have received a lot of attention in recent years for their use in multiple materials such as metals, ceramics, and polymers. The aim of this review article is to analyze the technology of fiber-reinforced polymers and its implementation with additive manufacturing. This article reviews recent developments, ideas, and state-of-the-art technologies in this field. Moreover, it gives an overview of the materials currently available for fiber-reinforced material technology.

A Review of Damage Tolerant Design, Certification and Repair in Metals Compared to Composite Materials

2014 ◽  
Vol 891-892 ◽  
pp. 1597-1602 ◽  
Author(s):  
Nabil Chowdhury ◽  
Wing Kong Chiu ◽  
John Wang
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Failure Modes ◽  
Structural Integrity ◽  
Fiber Reinforced Polymers ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Repair Efficiency ◽  
Mechanically Fastened ◽  
Damage Tolerant

A review of some of the various fatigue models introduced over the years for both metallic materials, in particular aluminium alloys followed by fatigue and durability concerns associated with composite materials. The move towards light weight and high stiffness structures that have good fatigue durability and corrosion resistance has led to the rapid move from metal structures to composite structures. With this brings the added concern of certifying new components as the damage mechanisms and failure modes in metals differ significantly than composite materials such as carbon fiber reinforced polymers (CFRP). The certification philosophy for composites must meet the same structural integrity, safety and durability requirements as that of metals. Hence this is where the challenge now lies. Substantial work has been conducted in the reparability of composite structures through bonding using various adherend thicknesses and joint types and has been shown to have higher durability than mechanically fastened repairs for thin adherends however these are currently unacceptable repair methods as they cannot be certified. Repairs are designed on the basis that the repair efficiency can be predicted and should be designed conservatively with respect to the various failure modes and include the surrounding structure.

scholarly journals Effects of Elevated Temperatures on the Compressive Strength Capacity of Concrete Cylinders Confined with FRP Sheets: An Experimental Investigation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Sherif El-Gamal ◽  
Khalifa Al-Jabri ◽  
Ahmed Al-Mahri ◽  
Saud Al-Mahrouqi
Keyword(s):  
Compressive Strength ◽  
Elevated Temperatures ◽  
High Strength ◽  
Strength Loss ◽  
Exposure Period ◽  
Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Strength Capacity ◽  
Concrete Cylinders ◽  
Strengthening Technique

Due to their high strength, corrosion resistance, and durability, fiber reinforced polymers (FRP) are very attractive for civil engineering applications. One of these applications is the strengthening of concrete columns with FRP sheets. The performance of this strengthening technique at elevated temperature is still questionable and needs more investigations. This research investigates the effects of exposure to high temperatures on the compressive strength of concrete cylinders wrapped with glass and carbon FRP sheets. Test specimens consisted of 30 unwrapped and 60 wrapped concrete cylinders. All specimens were exposed to temperatures of 100, 200, and 300°C for periods of 1, 2, and 3 hours. The compressive strengths of the unwrapped concrete cylinders were compared with their counterparts of the wrapped cylinders. For the unwrapped cylinders, test results showed that the elevated temperatures considered in this study had almost no effect on their compressive strength; however, the wrapped specimens were significantly affected, especially those wrapped with GFRP sheets. The compressive strength of the wrapped specimens decreased as the exposure period and the temperature level increased. After three hours of exposure to 300°C, a maximum compressive strength loss of about 25.3% and 37.9%, respectively, was recorded in the wrapped CFRP and GFRP specimens.

Application of Polymer Plaster Composites in Additive Manufacturing of High-Strength Components

2015 ◽  
Vol 825-826 ◽  
pp. 763-770 ◽  
Author(s):  
Stefan Junk ◽  
Rebecca Matt
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Low Cost ◽  
New Technology ◽  
High Strength ◽  
Testing Specimen ◽  
Whole Process ◽  
Infiltration Technique ◽  
Cost Of Materials ◽  
The Cost

Today, 3D-printing with polymer plaster composites is a common method in Additive Manufacturing. This technique has proven to be especially suitable for the production of presentation models, due to the low cost of materials and the possibility to produce color-models. But nowadays it requires refinishing through the manual application of a layer of resin. However, the strength of these printed components is very limited, as the applied resin only penetrates a thin edge layer on the surface. This paper develops a new infiltration technique that allows for a significant increase in the strength of the 3D-printed component. For this process, the components are first dehydrated in a controlled two-tier procedure, before they are then penetrated with high-strength resin. The infiltrate used in this process differs significantly from materials traditionally used for infiltration. The result is an almost complete penetration of the components with high-strength infiltrate. As the whole process is computer-integrated, the results are also easier to reproduce, compared to manual infiltration. On the basis of extensive material testing with different testing specimen and testing methods, it can be demonstrated that a significant increase in strength and hardness can be achieved. Finally, this paper also considers the cost and energy consumption of this new infiltration method. As a result of this new technology, the scope of applicability of 3D-printing can be extended to cases that require significantly more strength, like the production of tools for the shaping of metals or used for the molding of plastics. Furthermore, both the process itself and the parameters used are monitored and can be optimized to individual requirements and different fields of application.

scholarly journals Fiber Reinforced Composite Materials for Proton Radiation Shielding

2018 ◽  
Vol 55 (1) ◽  
pp. 5-8 ◽  
Author(s):  
Mihaela Raluca Condruz ◽  
Cristian Puscasu ◽  
Lucia Raluca Voicu ◽  
Ionut Sebastian Vintila ◽  
Alexandru Paraschiv ◽  
...  
Keyword(s):  
Composite Materials ◽  
Penetration Depth ◽  
Ion Beam ◽  
Radiation Shielding ◽  
Fiber Reinforced Polymers ◽  
Space Structures ◽  
Fiber Reinforced ◽  
Beam Irradiation ◽  
Proton Beam Irradiation ◽  
Reinforced Polymers

Nowadays scientific researchers aim to develop new material designs for space structures that can withstand the harsh conditions in space environment. Another goal is to reduce the weight and the launching cost of the structures. A solution to those needs is to integrate fiber reinforced polymers in spacecraft structural components. Radiation shielding is a requirement that has to be met by the materials used to manufacture space structures. Protons are one of the many charged particles that can influence the integrity of materials in space. In the present study three material designs were developed and their ability to shield proton beam irradiation was evaluated. The material designs consist in advanced composite materials (carbon fiber reinforced polymers - CFRPs) that integrate the concept Low Z - High Z - Low Z (tantalum foil) and metallic coatings. Simulations were performed to determine the penetration depth of an ion beam (energy 15 MeV) in the proposed material designs. It was observed that the beam�s penetration depth through a CFRP sample with Ta foil (sample�s thickness 2.08 mm) was about 75% of the sample�s thickness, 58% for CFRP sample with Babbitt coating (sample�s thickness 2.28 mm), 56% for the CFRP sample with Zn coating (sample�s thickness 2.28 mm) and 55% for the CFRP sample with Zn/Monel coating (sample�s thickness 2.28 mm). It seems that the proposed material designs provide ion beam protection similar with an aluminum sample of 2 mm thickness. The experimental procedure confirmed the results obtained from the simulations, all the material designs providing protection in case of proton beam irradiation with an energy of 15.8 MeV.

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