University of Illinois Urbana-Champaign

Strain rate and temperature dependence of ductile to brittle transition in molybdenum subjected to torsional loading

Weinstein, D.; Sinclair, G.M.; Wert, C.A.

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https://hdl.handle.net/2142/111865

Description

Title
Strain rate and temperature dependence of ductile to brittle transition in molybdenum subjected to torsional loading
Author(s)
  • Weinstein, D.
  • Sinclair, G.M.
  • Wert, C.A.
Issue Date
1959-12
Keyword(s)
  • Strain Rate
  • Temperature Dependence
  • Molybdenum
  • Torsional Loading
Abstract
Brittle failure in annealed arc-cast molybdenum in torsion was studied as a function of strain rate and temperature. Strain rates ranged from a maximum of 12.5 per second to a minimum of .005 per second. The temperature dependence of the yield point for these different strain rates was used to calculate a heat of activation for the yield point. The heat of activation was not a constant but was approximately a linear function of the stress at yield. The value extrapolated to zero stress is 36,000 cal/mole. This is close to the reported value of 33, 400 cal/mole for C diffusing in molybdenum. It is proposed that the rate effect in yielding is determined in part by diffusion of C (or other interstitial atom) in the metal.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 156
  • 1967-0452
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/111865
Sponsor(s)/Grant Number(s)
Wright Air Development Center, Contract No. AF 33(616)-5153, Project No. 7024
Copyright and License Information
Copyright 1959 Board of Trustees of the University of Illinois

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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.