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Ramberg-Osgood Stress-Strain curve

This page generates a stress-strain curve according to the Ramberg-Osgood method, ref 1.

ε = σ / E + 0.002 * (σ / t₂)^m [ref. 3 equation 9.8.4.1.2(b)]

Material Properties

Young's modulus :	E =	psi	Required field. 0 < E < ∞
0.2% yield stress	t₂ =	psi	Required field. 0 < t₂ < ∞
Curvature parameter :	m =	-	Required field. 0 < m < ∞
Ultimate stress	f_tu =	psi	Required field. 0 < f_tu < ∞
Max strain	ε_max =	-	Required field. 0 < ε_max < ∞

To update the curve, click here

NB. The output is stopped when either the stress exceeds f_tu or the strain exceeds 20%.

Tabulated Results

Stress	Strain
0	0.000000
29,442	0.002858
32,713	0.003176
35,984	0.003494
39,255	0.003811
42,527	0.004129
45,798	0.004449
49,069	0.004779
52,340	0.005166
55,612	0.005829
58,883	0.007717
60,674	0.010369
62,465	0.015858
64,255	0.027190
66,046	0.050306
67,837	0.096742
69,628	0.188495

References

NACA Technical Note No. 902 "Description of Stress-Strain Curves by Three Parameters" by Walter Ramberg and William R. Osgood.
NACA Technical Note No. 927 "Determination of Stress-Strain Values from 'Offset' Yield Strength Values" by H. N. Hill.
MMPDS-01 §9.8.4.1.2