Damage Tolerance Evaluation of Structures with Small Cracks,

Abstract

This paper deals with the analytical determination of the linear-elastic stress intensity factor (SIF) for structures with small cracks. Two different cases are considered : (a) through-the-thickness-cracks emanating from a circular hole, (b) semi-elliptical surface cracks. the analytical methods studied herein are : the WEIGHT- FUNCTION METHOD by GRANDT for the case (a) and the ENGINEERING METHOD by NEWMAN for the case (b). Results obtained from analyses are compared with corresponding test results. The comparisons show good agreement. Analyses show that a cracked pin-loaded hole is the most critical case as compared with other crack-configurations. Furthermore, analyses indicate the degree of conservative assessment when assuming a through-crack instead of a surface crack as far as the crack propagation behaviour is concerned. Both methods studied herein are recommended for practical application in aircraft design.

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1983
Accession Number
ADP001606

Entities

People

  • Lueder Schwarmann

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Configurations
  • Agreements
  • Aircraft Design
  • Aircrafts
  • Airframes
  • Crack Propagation
  • Cracks
  • Damage
  • Damage Tolerance
  • Engineering
  • Intensity
  • Materials
  • Physical Properties
  • Stress Intensity Factors
  • Stresses
  • Structural Components

Fields of Study

  • Engineering
  • Materials science

Readers

  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.