However today, carbon fiber is being used in wind turbines, automobiles, sporting goods, and many other applications. Thirty years ago, carbon fiber was a space-age material, too costly to be used in anything except aerospace. With carbon fiber and ZOLTEK, the future has arrived. Additionally, their fatigue properties are superior to all known metallic structures, and they are one of the most corrosion-resistant materials available, when coupled with the proper resins. Thus, the strongest carbon fibers are ten times stronger than steel and eight times that of aluminum, not to mention much lighter than both materials, 5 and 1.5 times respectively.
As a comparison, steel has a tensile modulus of about 29 million psi (200 million kPa). Other classifications, in ascending order of tensile modulus, include “standard modulus,” “intermediate modulus,” “high modulus,” and “ultrahigh modulus.” Ultrahigh modulus carbon fibers have a tensile modulus of 72.5 -145.0 million psi (500 million-1.0 billion kPa). Carbon fibers classified as “low modulus” have a tensile modulus below 34.8 million psi (240 million kPa). The English unit of measurement is pounds of force per square inch of cross-sectional area, or psi. Carbon fibers are classified by the tensile modulus of the fiber.
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