FiberReinforced Polymer

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The incorporation of FRP composite technology into the industrial world is less than a century old. The first known FRP product was a boat hull manufactured in the mid 1930’s as part of a manufacturing experiment using a fiberglass fabric and polyester resin laid in a foam mold.  

1. Description

2. Why

3. How

4. Future Trends

5. Related Links

Description

From this somewhat inauspicious beginning, FRP composites applications have revolutionized entire industries, including aerospace, marine, electrical, corrosion-resistance and transportation.Fiber-reinforced polymer (FRP) composite materials date back to the early 1940’s in the defense industry, particularly for use in aerospace and naval applications.  The U.S. Air Force and Navy capitalized on FRP composites high strength-to-weight ratio capability and inherent resistance to weather and the corrosive effects of salt air and sea. By 1945, over seven million pounds of fiberglass were being shipped, primarily for military applications.  Soon the benefits of FRP composites, especially its corrosion resistance capabilities, were communicated to the public sector.

Why

Fiberglass pipe, for instance, was first introduced in 1948 for what has become one of its widest areas of use within the corrosion market, the oil industry. FRP composites proved to be a worthy alternative to other traditional materials even in the high-pressure, large diameter situations of chemical processing. Besides superior corrosion resistance, FRP pipe offered both durability and strength thus eliminating the need for interior linings, exterior coatings, and/or cathodic protection.Since the early 1950’s, FRP composites have been (and still are) used extensively for equipment in the chemical processing, pulp and paper, power, waste treatment, metals refining and other manufacturing industries. Myriads of products and FRP installations help build a baseline of proven performance in the field in such products as chemical plant scrubbers, hoppers, hoods, ducts, fans, stacks, piping, pumps and pump bases, valve bodies and above-ground as well as underground tanks for chemicals or gasoline.

How

The decades after the 40’s brought new, and often times, revolutionary applications for FRP composites.  The same technology that produced the reinforced plastic hoops required for the Manhattan nuclear project in World War II, spawned the development of high performance composite materials for solid rocket motor cases and tanks in 60’s and 70’s. In fact, fiberglass wall tanks were used on the Skylab orbiting laboratory to provide oxygen for the astronauts. In 1953, the 1st production Chevrolet Corvette with fiberglass body panels rolled off the assembly line.During the late 1970’s and early 1980’s, many applications of composite reinforcing products were demonstrated in Europe and Asia.  In 1986, the world’s first highway bridge using composites reinforcing tendons was built in Germany.  The first all composites bridge deck was demonstrated in China.The marine market was the largest consumer of composite materials in the 1960’s.  In the 1970’s, the automotive market surpassed marine as the number one market; a position it retains.  Composites have also impacted the electrical transmission market with products such as pole line hardware, cross-arms, and insulators.Perspectives for fiber reinforced plastics (FRP) and FRP technologies have been summarized to the following items.

  • FRP shipping quantities according to the application during 1996-2005, in which the construction material field using corrosion resistance accounts for 60-65%
  • Types and properties of reinforced fibers such as glass fiber and carbon fiber.
  • Types and properties of matrix resins such as unsaturated polyester and epoxy resin.
  • New FRP structures using aramid fibers, three-dimensional fabrics, and glass fiber / carbon fiber hybrid.
  • FRP processing technolgies such as hand lay-up, spray-up, and gel coat.

The FRP industry is an industry that has constructed new materials meeting the needs as a primary material industry, and that has dramatically expanded its application fields.Now, high-performance racecars are the proving ground for technology transfer to passenger vehicles. In the 1960’s, the British and U.S. Navies were simultaneously developing minesweeper ships as FRP composites are not only superior to other materials in a harsh marine environment, they are also non-magnetic in nature.  It was also noticed at that time that one of the features of FRP is the ability of the materials to reduce the radar signature of the structure, such as a ship or an aircraft.High performance composites materials have been demonstrated in advanced technology aircraft such as the F-117 Stealth Fighter and B-2 Bomber.  Currently, FRP composites are being used for space applications and are involved in several NASA test initiatives.Composites have evolved since the 1950’s in architectural applications starting with semi-permanent structures and continuing with restoration of historic buildings and structural applications.  Typical products developed were domes, shrouds, translucent sheet panels, and exterior building panels.While the majority of the historical and durability data of FRP composite installations come from the aerospace, marine and corrosion resistance industries, FRP composites have been used as a construction material for several decades.  FRP composite products were first demonstrated to reinforce concrete structures in the mid 1950’s.  In the 1980’s, resurgence in interest arose when new developments were launched to apply FRP reinforcing bars in concrete that required special performance requirements such as non-magnetic properties or in areas that were subjected to severe chemical attack.

Future Trends

The first all composites pedestrian bridge was installed in 1992 in Aberfeldy, Scotland.  In the U.S., the first FRP reinforced concrete bridge deck was built in 1996 at McKinleyville, WV followed by the first all-composite vehicular bridge deck in Russell, KS. Numerous composite pedestrian bridges have been installed in U.S. state and national parks in remote locations not accessible by heavy construction equipment, or for spanning over roadways and railways.For the 21st century, composite fabricators and suppliers are actively developing products for the civil infrastructure, considered to be the largest potential market for FRP composites.  Concrete repair and reinforcement, bridge deck repair and new installation, composite-hybrid technology (the marriage of composites with concrete, wood and steel), marine piling and pier upgrade programs are just some of the areas that are currently being explored.

Keywords

Structural members; adhesives; bolted connections; bonded connections; composite materials; connections; fiber reinforced polymer; frame connections; FRP; interlocking connections; joints

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