Stress-Strain Relationships. in Yarns Subjected to Rapid Impact Loading

Abstract

When a textile yarn is impacted transversely, strain waves and transverse waves which " travel outwards away from the point of impact are initiated. Each strain-wave front travels at constant velocity. A transverse-wave front, however, changes its velocity each time it meets a reflected strain-wave front. This effect forms the basis of a new method used to measure strain-wave propagation velocities in a selection of textile yarns. Velocities obtained in this way are in good agreement with velocities obtained by two other methods. These velocities range in values from 1400 m. /sec. for undramn nylon to 5000 m./sec. for high tenacity rayon and glass fiber.