Strain-Energy-Density Factor Applied to Mixed Mode Crack Problems.

Abstract

The paper deals with the general problem of crack extension in a combined stress field where a crack can grow in any arbitrary direction with reference to its original position. In a situation, when both of the stress-intensity factors, k1, k2 are present along the crack front, the crack may spread in any direction in a plane normal to the crack edge depending on the loading conditions. Preliminary results indicate that the direction of crack growth and fracture toughness for the mixed problem of Mode I and Mode II are governed by the critical value of the strain-energy-density factor, S(cr). The analytical predictions are in good agreement with experimental data on the problem of an inclined crack in plexiglass and aluminum alloy specimens. The result of this investigation provides a convenient procedure for determining the critical crack size that a structure will tolerate under mixed mode conditions for a given applied stress. (Modified author abstract)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
AD0776019

Entities

People

  • George C. Sih

Organizations

  • Lehigh University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Agreements
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Experimental Data
  • Intensity
  • Mechanical Properties
  • Physical Properties
  • Stress Intensity Factors
  • Stresses
  • Toughness

Fields of Study

  • Engineering

Readers

  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design