Yield Stress According to Swift
1.3.2
One of the disadvantages of the Ludwik equation is that at φ0 the slope is infinite. Swift's approach brings an improvement.10
Eqn. 1
| Yield stress | kf | = | MPa |
| Strain hardening constant | C | = | MPa | |||
| Natural Strain | φ0 | = | ||||
| Natural strain | φ | = | ||||
| Strain hardening exponent | n | = |
Calc 1
Yield stress according to Swift10
Eqn. 2
Eqn. 3
| Strain hardening constant | C | = | MPa |
| Tensile strength | Rm | = | MPa | |||
| Strain hardening exponent | n | = |
Calc 2
Strain hardening constant C & strain hardening exponent n1011
The material-specific constant C can be approximately estimated using the tensile strength and uniform elongation from the tensile test.
10
Birkert, A. et al. / Umformtechnische Herstellung komplexer Karosserieteile / Springer Vieweg / Berlin - Heidelberg / 2013 / …
11
Doege, E. et. al. / Fließkurvenatlas metallischer Werkstoffe / Hanser Verlag / München / 1986 / …