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Textile Research Journal, Vol. 21, No. 12, 867-875 (1951)
DOI: 10.1177/004051755102101203

Effect of a Dynamic Fatigue Test on the Mechanical Properties of Tire Cords

James N. Grant

Southern Regional Research Laboratory, New Orleans, Louisiana

Geraldine M. Couturier

Southern Regional Research Laboratory, New Orleans, Louisiana

Mary W. Rhodes

Southern Regional Research Laboratory, New Orleans, Louisiana

Changes in the mechanical properties of cords subjected to dynamic fatigue were measured for cotton, mercerized cotton, and rayon tire cords. These data were obtained by the use of an instrument which subjected the cords under tension to localized dynamic forces under con trolled atmospheric conditions. The forces, when observed on an oscilloscope screen, were found to vary during the flex cycle. Flex life and ultimate elongation were found to be cumulative, regardless of whether the cords were fatigued continuously or were allowed to relax with or without static tension between periods of flexing. Calculated activation energies for fatigue failure were less than those for heat degradation. From the differences in properties a quali tative evaluation of tire cord behavior could be made.


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