Simplifications in the Behavior of Viscoelastic Composites With Growing Damage

Abstract

Some analytical results for the mechanical behavior of elastic composite materials and structures with growing damage are summarized and then extended to viscoelastic media. The effect of strain rate only at crack tips is considered first; it is shown that if the crack speed is a strong function of energy release rate, the overall mechanical response is like that for an aging elastic material. Both stable crack growth and unstable crack growth followed by arrest produce this aging-like behavior. Viscoelastic behavior throughout one or more of the phases is then introduced. A simplification is used in which only one relaxation modulus characterizes the viscoelasticity, apart from that at crack tips. Upon replacing the physical displacements in the response for an elastic material by quantities called pseudo displacements, a simple model for viscoelastic composites with growing damage is obtained. (jes)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1990
Accession Number
ADA225788

Entities

People

  • R. A. Schapery

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Civil Engineering
  • Composite Materials
  • Constitutive Equations
  • Crack Tips
  • Cracks
  • Displacement
  • Elastic Materials
  • Elastic Properties
  • Engineering
  • Equations
  • Fiber Reinforced Polymers
  • Free Energy
  • Materials
  • Mechanics
  • Time Dependence
  • Viscoelasticity
  • Work Functions

Readers

  • Calculus or Mathematical Analysis
  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.