Photoelastic Study of Elastic and Plastic Stress Fields in the Vicinity of a Notch.

Abstract

The ability to calculate stresses in critical areas by measuring strains at far-field locations will be essential to the success of new fatigue monitoring equipment currently being developed. In this thesis the photoelastic method was utilized to study plastic zone characteristics and residual compressive stresses in critical areas modeled by notched specimens. Data reduction methods for photoelastic measurements were developed by a thorough investigation of reinforcement effects and by a careful determination of material properties of PS-1C Photoelastic Material and 7075-T6 aluminum. A modified Ramberg-Osgood data reduction method was developed for determining stresses from strains measured in the plastic region. Stresses obtained from slip-line theory for rigid-perfectly-plastic material were compared to the experimental results, and differences noted. Notch tip stresses and strains were compared to predictions using Neuber's relation. The measured data indicated stress concentrations 20.9% lower than predicted by Neuber. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1980
Accession Number
ADA096295

Entities

People

  • Frank E. Stenstrom

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Accuracy
  • Aluminum
  • Data Reduction
  • Experimental Data
  • Far Field
  • Geometry
  • Materials
  • Measurement
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Properties
  • Regression Analysis
  • Stress Concentration
  • Stress Strain Relations
  • Stresses
  • Thickness
  • United States Naval Academy

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.