Elastic-Plastic Fracture Mechanics Analysis of Small Cracks

Abstract

For many materials the fracture strength and fatigue lifetime is controlled by small cracks that can grow at sizes and applied stress levels which are below those predicted from data for long cracks. The objective of this paper is to describe how elastic-plastic fracture mechanics analysis can be used to interpret small crack behavior. The results of the elastic-plastic analysis indicate that deviations from LEFM begin at about 0.7 of the yield stress and that the trend of the small crack data can be predicted. The results of 3-D elastic-plastic analysis of a surface crack show a unique variation of the crack driving force along the crack front. This information is used to predict crack shapes during cyclic crack growth.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1982
Accession Number
ADP000011

Entities

People

  • G. G. Trantina
  • H. G. Delorenzi

Organizations

  • General Electric

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Contour Integrals
  • Crack Tips
  • Cracks
  • Elastic Materials
  • Elements
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Geometry
  • Integrals
  • Materials
  • Mechanics
  • Plastic Properties
  • Stress Intensity Factors
  • Stress Strain Relations
  • Stresses
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Engineering

Readers

  • Materials Science (Mechanical Engineering).