DYNAMIC SHEAR STRESS - STRAIN - STRAIN RATE RELATIONS OF IRON,
Abstract
The mechanical behavior of Armco iron and Ferrovac E iron under torsional impact loading was studied, and an experimental technique similar to the split Hopkinson pressure bar method was used. The shear stress--strain curves were determined at shear strain rates from 1,000,000 to 800 per sec. The tested specimens were examined metallographically. The flow stress of both irons was sensitive to the strain rate and exhibited similar trends. The upper yield point of Armco iron was more sensitive to the strain rate than the Ferrovac E iron when the shear strain rate was higher than 2 per sec. When the shear strain rate was >250 per sec, the Armco iron became brittle and failed catastrophically without appreciable plastic flow. In the brittle fracture, the main cracks ran along about 45 deg to the specimen length, indicating a tension failure instead of shear, and followed the grain boundaries. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1967
- Accession Number
- AD0664888
Entities
People
- Charles C. S. Yen
- Ching H. Yew
Organizations
- The Aerospace Corporation