Accession Number:

ADA235525

Title:

Crazing in Polymeric and Composite Systems

Descriptive Note:

Final rept. 15 Mar 1987-14 Mar 1990

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND MECHANICS

Personal Author(s):

Report Date:

1990-04-23

Pagination or Media Count:

137.0

Abstract:

The technical report on crazing polymeric and composite systems encompasses several phases of mesomechanics studies which lead into continuum and non-continuum microdamage mechanics investigations. It is based upon the first principles of physics and mechanics and the sciences of the microstructure of materials. Ideas have been introduced in developing new theories in time dependent deformation, strength theories and damage criteria for solids and composite systems. The initiation and propagation of crazing as quasifracture, the time dependent fracture strength of oriented polymers, the associated molecular orientation and ultimate strength in and around a craze, and the interaction of crazes in polymeric and composite materials are some of the features to be understood. The determination of the time dependent fracture strength of polymers and composite systems, the displacement field and the distribution of stresses in the vicinity of craze-crack transition regions as well as the behavior of craze and crack propagation are problems to be considered.

Subject Categories:

  • Polymer Chemistry
  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE