Modulus, Elongation, Elastic Recovery, and Resilience

As discussed in Section 14.1.2, strength probably is the most essential mechanical property of fibers. Fibers must have adequate strength to survive the fabrication process and be made into end-products. Other mechanical properties, such as modulus, elongation, elastic recovery, resilience, etc., may be less essential, but they are needed for the products to be accepted by the customers. Most applications have basic requirements for these secondary mechanical properties. In addition, although secondary mechanical properties ate less essential than the fiber strength, they still may affect the processing parameters that are important for the production of the end-products. 

The modulus of a fiber is a measure of its stiffness. In tensile tests, the fiber modulus is defined as the ratio of the tensile stress over the tensile strain in the range of stress in which Hooke s law holds. Ejqterimentally, the fiber modulus is determined by the slope of a stress-strain curve. The fiber modulus is an intrinsic 

Spectra Natural Pofymer Fibers (inclnding regenerated fibers) 0.97 

Sources Hull, D., et. al., An Introduction to Composite Materials, Second Edition, Cambridge University Press, 1996. Mwaikambo, L.Y., African Journal of Science and Technology, 1, 120-133, 2006. Tortora, P.G., Understanding Textiles, Fourth Edition, Macmillian Publishing Company, 1992.  

Fiber Breaking Elongation (%) Elastic Recovery at % Elongation (%) 

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