Accession Number:

ADA379759

Title:

Certain Physical Properties and Applications of Nitinol.

Descriptive Note:

Corporate Author:

ASTRO RESEARCH CORP CARPINTERIA CA

Personal Author(s):

• Schuerch, H. U.

Report Date:

1968-11-01

Pagination or Media Count:

67.0

Abstract:

Experimental investigations have been performed of a number of physical properties of the nickel-titanium alloy known as Nitinol. The program was limited to wires and tapes of two specific compositions. Four types of tests were undertaken to characterize some of the thermomechanical memory effects observed in this alloy 1 Stress-strain, for repeated load applications at constant temperature. 2 Temperature-elongation, for repeated temperature cycles at constant stress level. 3 Temperature-elongation for repeated temperature cycles at discontinuously variable stress levels simulating a thermodynamic power generation cycle. 4 Differential thermal analysis of unstressed samples for the complete transition temperature range during repeated cooling and heating cycles. Based upon evaluation of the data obtained, a hypothesis of the deformation mechanism is postulated. Several engineering models demonstrating different applications of Nitinol were designed, fabricated, and tested. Descriptions of the physical properties characterized in the tests and of the various models and devices are presented in this report.

Descriptors:

• *PHYSICAL PROPERTIES
• *NICKEL ALLOYS
• *TITANIUM ALLOYS
• THERMOMECHANICS
• TEMPERATURE
• WIRE
• LOADS(FORCES)
• DEFORMATION
• ALLOYS
• COOLING
• CYCLES
• TRANSITION TEMPERATURE
• ENGINEERING
• HEATING
• ELECTRIC POWER PRODUCTION
• THERMODYNAMIC CYCLES
• HYPOTHESES
• DIFFERENTIAL THERMAL ANALYSIS

Subject Categories:

• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE