TENSILE RUPTURE OF TIRE CORDS IN VARIOUS TWISTS
1976 Volume 32 Issue 8 Pages T346-T354
Details
1976 Volume 32 Issue 8 Pages T346-T354
The tensile rupture of tire cords in various twists were investigated. The breaking strength-elongation curves were recorded with a synchroscope. The hightensile speed in this investigation was defined as the speed at the rate of 34, 650%/min. extension (57.7cm/sec) and the following results were obtained: (1) In the low tensile speed test (at the rate of 100%/min. extension (0.17cm/sec.)), the breaking strength of a single yarn of two-ply cord decreased with the increments of the twist, and experimental data showed good agreement with the theoretical values by Platt's equation.
(2) The breaking strength-twist curve showed two maximum values in the high tensile speed test for the nylon two-ply cord. One appeared at the value of 0.2 t/cm S twist of a single yarn of two-ply cord, and one at the value of 1.2 t/cm Z twist of a single yarn of its cord, respectively.
(3) The values of tan S corresponding to various twists of two-ply cord were found to have a correlation with the breaking strength of its cord in varied twists.
