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The initiation of yielding and brittle fracture in annealed mild steel

Citation

Hendrickson, James A. (1957) The initiation of yielding and brittle fracture in annealed mild steel. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-07272004-155051

Abstract

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The initiation of brittle fracture and the transition between ductile and brittle behavior of an annealed mild steel has been investigated. A theoretical and experimental investigation has been made on notched tensile specimens to determine the state of stress beneath a notch which governs the initiation of a brittle fracture. The experimental investigation was conducted for constant rates of stress application of from [...] to [...] [...] sec at temperatures of -110[degrees] F (-79 [degrees] C) and -200[degrees] F (-129[degrees] C). The stress analysis of the notched specimen includes the effect of limited plastic deformation known to precede brittle fracture.

The true tensile stress at the position and instant of initiation of brittle fracture in the notched tensile specimens is determined from the experimental results, a knowledge of the yielding behavior of the material, and the elastic-plastic stress analysis. In this manner it is shown that brittle fracture occurs when a critical value of the maximum tensile stress is attained. This critical value of the tensile stress is found to be constant, independent of rate and temperature, and is shown to occur at the elastic-plastic boundary beneath the root of the notch.

The information gained from the investigation of the initiation of brittle fracture in notched tensile specimens is applied to the prediction of the transition temperature in the case of the Izod impact test. The prediction is checked by experiment and the agreement is found to be good.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Wood, David Shotwell
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1957
Record Number:CaltechETD:etd-07272004-155051
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-07272004-155051
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2985
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:28 Jul 2004
Last Modified:26 Dec 2012 02:56

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