University of Illinois Urbana-Champaign

Torsional properties of steels at high rates of strain tr 1

Jones, P.G.; Dolan, Thomas J.

Permalink

https://hdl.handle.net/2142/112495

Description

Title
Torsional properties of steels at high rates of strain tr 1
Author(s)
  • Jones, P.G.
  • Dolan, Thomas J.
Issue Date
1954-05
Keyword(s)
  • Steel
  • Torsion
  • Strain
Abstract
An experimental study was made to determine the effects of strain-rate, temperature, type of notch, and size of specimen on two armor plate steels and S. A. E. 4340 steel in torsion. Unnotched specimens were ¼ in. in diameter and the root diameters of notched specimens were 3/16 in. and 3/8 in. Two sharpnesses of notch were used. Two rates of torsional strain were obtained by using angular velocities of 27 rpm. And 1300 rpm. for the flywheel which loaded the specimen. The tests were conducted at room temperature and 700 F. Torque, angle of twist, and time were continuously recorded and the torsional properties were determined. In general it was found that for the ranges of strain-rate and temperature used, an increase in strain-rate caused an increase in strength and a decrease in ductility and total energy absorbed. An increase in temperature caused a decrease in strength and energy that were accompanied by a decrease in ductility at low strain-rate or an increase in ductility at high strain rates. It was found that strength decreased with an increase in sharpness of notch. Although there was a decrease in yield or ultimate strength with increased size of specimen, the “size-effect” on strength was small. The ratio of total energy absorbed for the two sizes of specimens varied from about 3 to 9 depending on the material, notch sharpness, and test conditions.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 74
  • 1967-0370
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112495
Sponsor(s)/Grant Number(s)
Office of Naval Research, U. S. Navy, Contract N6 ori-07149
Copyright and License Information
Copyright 1954 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.