Accession Number : AD0650578

Title :   PLASTIC FLOW RATES IN NYLON INTERPRETED IN TERMS OF DISLOCATION MOTION,

Corporate Author : ILLINOIS UNIV URBANA DEPT OF MINING METALLURGICAL AND PETROLEUM ENGINEERING

Personal Author(s) : Dey,B. N.

Report Date : 1967

Pagination or Media Count : 25

Abstract : Observations of the propagation of plastic band-fronts in non-oriented Nylon 6-10 monofilaments were made as a function of load and temperature; and analyzed in terms of dislocation dynamics. From the shapes and the velocities of the band-fronts, dislocation velocities are estimated and found to have a stress-dependence similar to that found for non-polymeric crystalline materials. The maximum strain required to initiate flow in Nylon is about 40%, independent of the load and strain-rate, and in agreement with previous experiments of Miklowitz, and of Williams and Bender. Measurements by Williams and Bender for Nylon 66 were also analyzed. From the stress-dependence of creep incubation times reasonable values for the mean dislocation velocity in Nylon 66, and the associated activation energy, were obtained. It is tentatively concluded that the rate of breaking of hydrogen bonds limits dislocation mobility in Nylons 6-10 and 66. (Author)

Descriptors :   (*NYLON, PLASTIC PROPERTIES), FILAMENTS, DISLOCATIONS, PROPAGATION, CREEP, MOLECULAR ASSOCIATION, CRYSTAL STRUCTURE, LOADS(FORCES), TEMPERATURE, HEAT OF ACTIVATION, STRAIN(MECHANICS)

Subject Categories : Polymer Chemistry
      Textiles
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE