Ultimate and Yield Plastic Bending Allowables Using Cozzone Stresses

The following analysis calculates the Cozzones stresses and plastic bending allowables given material modulus, ultimate strength, yield, ultimate strain, and section shape factor.

• Use of Cozzone method for plastic bending in short tranverse (ST) direction is not recommended
• Elevated temperature values of f_m and f_o must be based on a corrected full range stress-strain curve at temperature
• Use smaller of tension or compression stress-strain curves and assume other is identical - small conservative error

Material Properties Input

---

Units: English / Metric

---

Material Allowables

Tension Modulus - E:
Ultimate Tension - F_tu:
Tension Yield - F_ty:
Ultimate Tension Strain (%) - ε_u:

Bending Section Properties

Section Shape Factor - k:1.000 | 2-Noded Beam 1.273 | Thin Round Tube1.333 | Hour-glass1.500 | Rectanglar1.698 | Round2.000 | Diamond

or, Custom Section Shape Factor - k:

---

MADE IT HERE

References

Bruhn, E. F. (1973). Analysis and Design of Flight Vehicle Structures. Indianaponlis, IN.

Peery, D. J. (1950). Aircraft Structures. New York, NY.

Timoshenko, S. P. (1961). Theory of Elastic Stability. New York, NY.

Niu, M. C. (2001). Airframe Stress Analysis and Sizing. Hong Kong.

Flabel, J. C. (1997). Practical Stress Analysis for Design Engineers. Hayden Lake, ID.

Boresi, A. P. (1993). Advanced Mechanics of Materials. New York, NY.

---

DISCLAIMER: The methods and calculation on aNOWysis.com are provided as means to educate the reader. There is no warranty, expessed or implied, as to the relevance or accuracy of the methods or calculations. All calculations should be checked by a qualified analyst for appropriateness and accuracy. We will not be held liable for any damages, injuries or deaths caused by using methods or calculations from this site.