Accession Number:

ADA183027

Title:

Fracto-Emission from Polymers

Descriptive Note:

Summary rept. 1 Jun 1985-30 May 1987

Corporate Author:

WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS

Personal Author(s):

• Dickinson, J. T.

Report Date:

1987-06-21

Pagination or Media Count:

182.0

Abstract:

Progress in the investigation of fracto-emission FE from polymers, crystalline materials, and interfaces are presented involving measurements of electron, photon, radiowave, and neutral atom and molecule emissions. We examine FE during the peeling of binder elastomer from single crystals of RDX these emissions show FE features unique to adhesive failure. We present images of the photon emission during the peeling of adhesives. We also present mass spectroscopic measurements of the neutral particles emitted from the fracture of single crystals of MgO. In an appendix, we present results of simultaneous measurements of photon and electron emission from single crystal MgO. In addition, we present experiments on the consequences of simultaneous exposure of polymers to electron beam radiation and mechanical stress. In these studies we show that cracks can be initiated andor propagated at stresses lower than critical stress values. The morphology of the stressed polymers plays a key role in the observed response.

Descriptors:

• *CRACKS
• *CRYSTALS
• *POLYMERS
• MECHANICAL PROPERTIES
• EXPOSURE(GENERAL)
• MOLECULES
• NEUTRAL
• MATERIALS
• ELASTOMERS
• FAILURE
• SINGLE CRYSTALS
• ATOMS
• MASS SPECTROSCOPY
• FRACTURE(MECHANICS)
• ELECTRONS
• ELECTRON BEAMS
• CRACK PROPAGATION
• PARTICLES
• ELECTRON EMISSION
• PHOTONS
• SYNCHRONISM
• ELECTRON IRRADIATION
• BINDERS
• ENERGETIC PROPERTIES
• RDX
• ADHESIVES
• RADIATION DAMAGE
• MEASUREMENT
• MICROCRACKING
• STRESSES
• EMISSION

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE