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Description of stress-strain curves by three parametersA simple formula is suggested for describing the stress-strain curve in terms of three parameters; namely, Young's modulus and two secant yield strengths. Dimensionless charts are derived from this formula for determining the stress-strain curve, the tangent modulus, and the reduced modulus of a material for which these three parameters are given. Comparison with the tensile and compressive data on aluminum-alloy, stainless-steel, and carbon-steel sheet in NACA Technical Note No. 840 indicates that the formula is adequate for most of these materials. The formula does not describe the behavior of alclad sheet, which shows a marked change in slope at low stress. It seems probable that more than three parameters will be necessary to represent such stress-strain curves adequately.
Document ID
19930081614
Document Type
Other
Authors
Ramberg, Walter (National Bureau of Standards)
Osgood, William R (National Bureau of Standards)
Date Acquired
September 6, 2013
Publication Date
July 1, 1943
Report/Patent Number
NACA-TN-902
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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