Accession Number:

AD0269862

Title:

ON EFFECTS OF CARBON AND MANGANESE CONTENT AND OF GRAIN SIZE ON DYNAMIC STRENGTH PROPERTIES OF MILD STEEL

Descriptive Note:

Corporate Author:

SHIP STRUCTURE COMMITTEE WASHINGTON D C

Personal Author(s):

Report Date:

1961-12-27

Pagination or Media Count:

1.0

Abstract:

The exceptionally low du tility of mild steel when separated by a rapidly moving crack may be attributed in part to its plastic flow strainrate sensitivity. The elevation in y eld strength under conditions of rapidly rising stress adjacent to the crack tip suppresses formation of the energy-absorbing plastic zone. Variation in composition, particularly of C and Mn content which affect the notched bar impact transition temperature, should also affect strain-rate sensitivity if this description is applicable. The general trends in yield point strain-rate sensitivity are found in agreement with effects of composition on the Charpy transition temperature. A good correlation is found to exist between the parameter k, found from the grain size dependency of dynamic upper yield strength, and the transition temperature expectancy for given composition. Plastic flow stress, at given high strain rate, can be correlated with free path in ferrite better than with ferrite grain size. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE