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The Dynamic Stress-Strain Relation of Annealed 2S Aluminum Under Compression Impact


Johnson, James Edgar (1953) The Dynamic Stress-Strain Relation of Annealed 2S Aluminum Under Compression Impact. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/3CM0-PH78.


This thesis presents the results of a study of the stress-strain relation of a metal when subjected to compression impact. An annealed 2S aluminum is used for this investigation. Two methods of securing the dynamic stress-strain curve are considered; namely, from the measurement of impact stress and of maximum plastic strain as functions of the impact velocity from 3.15 to 125 ft/sec. The dynamic stress-strain relations obtained by these methods are compared with the static stress-strain curve. Both of the dynamic stress-strain relations lie considerably above the static curve. However, the two dynamic relations are not coincident which indicates that a single dynamic stress-strain curve cannot properly describe the behavior of the material for all impact velocities. A family of stress-strain curves is postulated in order to explain the difference between these two relations. Each curve of the family depends upon the final strain or impact velocity. It is further concluded that the rise of the stress-strain curve under dynamic loading cannot be induced by moderate loading rates.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Mechanical Engineering and Electrical Engineering)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Minor Option:Electrical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Clark, Donald S. (advisor)
  • Wood, David Shotwell (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1953
Record Number:CaltechETD:etd-09242002-112143
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3741
Deposited By: Imported from ETD-db
Deposited On:25 Sep 2002
Last Modified:19 May 2023 22:16

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PDF (Johnson_j_1953.pdf) - Final Version
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