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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.
Subject(s):Strain Rate
Temperature Dependence
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.
Issue Date:1959-12
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 156
Genre:Technical Report
Sponsor:Wright Air Development Center, Contract No. AF 33(616)-5153, Project No. 7024
Rights Information:Copyright 1959 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    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.

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