Mechanical Behavior of 97.2% W Alloy in Tension at High Temperatures
Abstract
The objective was to investigate the behavior of 97.2% tungsten alloy in tension. A modified button head specimen was heated using resistive heating techniques. The affect high temperatures, medium strain rates, and heating rates had on the stress-strain results were observed. A high speed optical pyrometer and an optical clip gage were utilized for temperature and strain measurements. The optical clip gage could measure strain at strain rates up to 11.8/s. The room temperature experiments were at strain rates of 10-(exp 4)/s, 10-(exp 2)/s, and 5/s. The high heating rate experiments were at temperatures of 727 deg C, and 1097 deg C, heating rates of 5.4 deg C/sec and 536 deg C/sec and a strain rate of 5/s. Increase in yield point and flow stress were observed as the heating rate was increased. A modified Johnson-Cook (MJ+C) material model was proposed to include the effect of heating rate. The constants in the MJ+C model were determined based on the experimental results. Tungsten, High temperatures, Strain rate, Material modeling.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1994
- Accession Number
- ADA284797
Entities
People
- John L. Green
Organizations
- United States Army Research Laboratory