Thermal-Mechanical Fatigue Behavior of Nickel-Base Superalloys.

Abstract

This report presents the main achievements of a 36-month research program the main objective of which was to gain more insight into the problem of crack growth under thermal mechanical fatigue (TMF) conditions. The program was arranged into five technical tasks. Under Task I, the goal was to identify the crack propagation conditions in aircraft engines (hot section) and to assess the validity of conventional fracture mechanics parameters to address TMF crack growth. The second task defined the test facilities, test specimen and the testing conditions needed to establish the effectiveness of data correlation parameters identified in Task I. Under Task III, a computerized testing system to measure the TMF behavior (LCF and CG behaviors) of various alloy systems was built. A crack propagation test program was defined and conducted under Task IV. The test variables included strain range, strain rate (frequency) and temperature. Task V correlated and generalized the Task IV data for isothermal and variable temperature conditions so that several crack propagation parameters could be compared and evaluated.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1986
Accession Number
ADA170599

Entities

People

  • N. Marchand
  • R. M. Pelloux

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Control Systems
  • Crystal Structure
  • Data Acquisition
  • Fatigue Tests (Mechanics)
  • Fracture (Mechanics)
  • Gas Turbines
  • Materials
  • Materials Science
  • Measurement
  • Mechanics
  • Plastic Explosives
  • Stress Strain Relations
  • Tensile Strength
  • Turbine Components
  • Turbines
  • Waveforms

Readers

  • Instructional Design and Training Evaluation.
  • Materials Science (Mechanical Engineering).