Evolution and Stability of a Crack with a Process Zone. Experimental and Theoretical Studies. Two Parameter Crack Layer Model: Equilibrium, Evolution, Stability. Aging Phenomena and the Intrinsic Material Geometry.

Abstract

The report contains two parts: (1) Two parameter crack layer model and (2) Aging phenomena and the intrinsic material geometry. In the first part, the crack layer model is substantiated from the thermodynamic standpoint, the kinetic equations governing crack layer evolution are derived, and stability of the crack layer stationary state and propagation is analyzed. The proposed model is examined for the engineering thermoplastics studied in detail experimentally. In the second part, a variational approach to the derivation of constitutive equations of material aging is proposed. Elastic properties and irreversible deformations are represented by a 4D material metric tensor. Equations governing evolution of the tensor are obtained and studied. The theory is illustrated by examples.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 30, 1996
Accession Number
ADA322238

Entities

People

  • A. Chudnovsky
  • S. Preston
  • Y. Shulkin

Organizations

  • University of Illinois at Chicago

Tags

DTIC Thesaurus Topics

  • Angular Momentum
  • Computational Fluid Dynamics
  • Computational Science
  • Constitutive Equations
  • Continuum Mechanics
  • Differential Equations
  • Elastic Properties
  • Energy Transfer
  • Engineering
  • Equations
  • Geometry
  • Material Degradation Processes
  • Materials
  • Materials Engineering
  • Mechanics
  • Three Dimensional
  • Two Dimensional

Readers

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