An Investigation of Constitutive Models for Predicting Viscoplastic Response during Cyclic Loading.

Abstract

The Air Force's Engine Structural Integrity Program (ENSIP) (Ref 1) requires determination of damage tolerance for jet engine components in order to allow more economical rejection criteria to be adopted. To this end, means have been developed for predicting fatigue crack growth in jet engine components such as turbine disks made of nickel-based superalloys and operating at elevated temperatures. The presence of time-dependent plastic deformation greatly affects crack propagation rates, particularly at elevated temperatures and thus must be accounted for when modelling crack growth in turbine materials. The purpose of this thesis was to investigate the frequency response aspects of the Bodner-Partom constitutive law's behavior and to compare its results with those of other models and to cyclic and non-cyclic uniaxial tensile test data.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1988
Accession Number
ADA194875

Entities

People

  • David A. Shaffer

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Air Force
  • Cracks
  • Creep
  • Engineering
  • Frequency
  • Frequency Response
  • Fuel Systems
  • Hardening
  • High Temperature
  • Materials
  • Plastic Deformation
  • Plastic Properties
  • Strain Hardening
  • Stress Concentration
  • Stress Strain Relations
  • Stresses
  • Turbines

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.