Accession Number:

AD0260775

Title:

AN INTERPRETATION OF LOWER YIELD POINT PLASTIC FLOW IN THE DYNAMIC TESTING OF MILD STEEL

Descriptive Note:

Corporate Author:

SHIP STRUCTURE COMMITTEE WASHINGTON D C

Personal Author(s):

Report Date:

1961-06-26

Pagination or Media Count:

1.0

Abstract:

Evaluation of the role of rapid plastic flow in the fracture process necessitates some measure of elastic and plastic strength which will be suitable for high strain rates. Strain distribution was measured after stopping a dynamic machine during the lower yield. From head displacement and load records obtained during the test and also from plastic flow rate sensitivity measured in other high-speed tests on the same material, the strain distribution was predicted. The predicted strain distribution behind the Luders band front was in good agreement with that measured. When the velocity of the band front is corrected for its diminution owing to continued flow behind the front it is related to driving stress with a sensitivity corresponding to that for the upper yield point--or the delayed yield. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE