Carbon fiber is a brittle material, and the tensile strength is controlled by various defects. Defects are also divided into surface defects and internal defects. As for the source of defects, it can be divided into congenital defects and acquired defects. The former is derived from the original silk &ldquo, hereditary &rdquo, and the latter is produced in the process of production. Today, give you a brief introduction of the tensile strength and defects of carbon fibers.
Among the various defects of carbon fiber, the surface defect is about 90%, which is one of the main factors affecting the tensile strength. The continuous improvement of the tensile strength of carbon fibers is due to the constant decrease in the size of the defects. That is to say, 1980s, defects of large size is below 4GPa micron, the tensile strength of the fibers. The equivalent of the products of T300 and T400; and in late 1980s, defect size has been controlled at sub micron level, the tensile strength of carbon fiber has been increased to 7GPa left and right, the carbon fiber type, T700 T800 and T1000.
At the beginning of the 21 century, people are still taking various technical measures to continue to reduce the defect size, which is expected to increase the tensile strength of carbon fiber to about 1OGPa. At present, a PAN based carbon fiber with a tensile strength of 9.03GPa has been developed in the laboratory. In other words, basic idea of improving the tensile strength of carbon fiber is to reduce all kinds of defect size, which is consistent with the Glasgow Griffith micro crack theory and weakest link theory.
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