Abstract
The tensile tests of Polypropylene, Nylon 6 and polyester Tetoron fibers have been carried out with tensile speed varying from 3.3×10-3cm/sec to 1.6×102cm/sec, and the shape of fibers at the point of rupture has been investigated with microphotographs.
The following results have been obtained:
(1) All kinds of fibers are broken down at high tensile speed found to have a tip of the nailhead shape at the point of rupture, the shape of ruptare can easily be distinguished from rupture due to ductility or brittleness. This kind of rupture is named melting type rupture.
(2) With the increase of tensile speed, the type of rupture found at the breaking point of the fibers also changes in the order of ductile, brittle and melted rupture.
(3) The lowest tensile speed at which melting type rupture appears is 3.3×10-3cm/sec for polypropylene fibers, 1.6cm/sec for Nylon 6 fibers, and 1.6×102cm/sec for PET fibers. This shows that the lower the melting point of fiber the lower the impact speed at which melting type rupture appears will be.
