Accession Number:

ADA160510

Title:

Fracto-Emission from Polymers.

Descriptive Note:

Annual technical rept. Jun 84-Jun 85,

Corporate Author:

WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS

Personal Author(s):

Report Date:

1985-10-15

Pagination or Media Count:

125.0

Abstract:

Crack propagation through an insulating material or at an interface produces regions of high electronic and chemical activity on the freshly created surfaces. This activity causes the emission of particles, i.e. electrons, ions, and neutral species, as well as photons, from the surfaces both during and after crack propagation. This emission is called fratoemission FE, and in many ways serves as a probe of the electronic and chemical activity of the fracture surfaces. In this report we present our results on the fracto-emission from model propellents with a variety of formulations, the fracto-emission from a metal-polymer interface with and without an externally applied electric field, the photon and radiowave emission from peeling pressure sensitive adhesives, the detection of atom and molecular emission neutral charge emitted from the fracture of inorganic single crystals, and a study of the effect of electron bombardment of single fibers of a polymer, kevlar-49. In addition, we discuss briefly the work in progress in several areas related to the above projects the fracto-emission mechanisms from single crystal inorganics, the neutral emission from both polymers and inorganics, the fracto-emission from explosive crystals, a number of interfacial failure studies including the fracture of particulate-filled binders, and further work in the area of radiation induced fracture.

Subject Categories:

  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE