Crack Branching in Homalite-100 Sheets

Abstract

Crack branching in Homalite-100 sheets of 1/8-inch and 3/8-inch thickness was studied by using dynamic photoelasticity. Dynamic stress intensity factors, crack velocities and branching angles were measured. Corresponding static stress intensity factors were determined by the method of finite element analysis. Dynamic stress intensity factors reached a peak value at branching with a value of three times larger than the fracture toughness of the material and preceded the actual branching. The dynamic stress intensity factor after branching drops and then increases again to the maximum stress intensity at which point branching occurs again. Roughness of the fracture surface can be related to dynamic stress intensity factor and crack velocities near the branching stress intensity factors and terminal crack velocities, respectively. Average branching angle was 26 degrees.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1972
Accession Number
AD0744661

Entities

People

  • Albert S. Kobayashi
  • B. G. Wade
  • S. T. Chiu
  • W. B. Bradley

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Cameras
  • Classification
  • Contracts
  • Crack Propagation
  • Crack Tips
  • Engineering
  • Equations
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Materials
  • Mechanics
  • Military Research
  • Near Field
  • Photographs
  • Photography
  • Stress Intensity Factors
  • Surface Roughness

Readers

  • Materials Science (Mechanical Engineering).