Thermomechanical Characteristics of Nitinol

Abstract

The flow stress of a common shape memory alloy, a particular alloy of nitinol, is investigated and presented as a function of temperature and strain. The reversion stress, that stress necessary to maintain a constant strain as a result of a martensitic phase transforming to the parent phase, is presented as a function of temperature and amount of prestrain. This reversion stress is demonstrated to approximate, during the cooling process, the flow stress. The stability of the reversion stress is investigated and is presented as a function of time at 220 deg C. A model of a shipboard device using a shape memory alloy is constructed and studied to compare with pure tensile data.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1975
Accession Number
ADA009986

Entities

People

  • John M. Johnson

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Composite Materials
  • Elastic Properties
  • Energy
  • Engineering
  • High Temperature
  • Materials
  • Materials Science
  • Mechanical Working
  • Metal Matrix Composites
  • Model Tests
  • Modulus Of Elasticity
  • Phase Transformations
  • Schools
  • Shipboard
  • Strain Rate
  • United States

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Powder metallurgy of Titanium alloys.