Accession Number : AD0781318

Title :   On the Mechanical Constitution of Damageable Materials.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION MECHANICS AND MATERIALS RESEARCH CENTER

Personal Author(s) : Brockway,G. S. ; Allen,G. D.

Report Date : MAY 1974

Pagination or Media Count : 42

Abstract : In the investigation, the elements of a mechanical constitutive theory for materials subjected to accumulated local damage, such as that resulting from the growth of small flaws, are laid down within the framework of Noll's theory of simple materials. A macroscopic definition of deformation--induced damage in a material with memory undergoing a motion having finite deformation gradients having first been given, the question of quantifying the damage done by a particular strain history is addressed. It is found that there are constitutive functionals for which the damage cannot be meaningfully measured without a knowledge of the subsequent deformation. The remainder of the paper is devoted to a consideration of a class of damageable materials (termed simple) for which the accrued damage can be measured solely in terms of the history of strain. A suitably modified fading memory postulate on the stress-functionals of such materials is introduced and its consequences explored. The significance of these theoretical notions is illustrated through a number of examples pertinent to the behavior of composite materials. (Author)

Descriptors :   *Continuum mechanics, *Composite materials, Damage, Mechanical properties, Stresses, Functions(Mathematics)

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE