Onset of yielding
1.3.3
Knowing the yield strength, tensile strength and strain hardening exponent n makes it possible to estimate when the sheet metal begins to flow. Sheet metal areas within a sheet metal field with lower elongation will tend to spring back.
Eqn. 1
Eqn. 2
| Yield strain | e0 | = | % | ||
| Natural strain | φ | = |
| Yield strength | Rp 0,2 | = | MPa | |||
| Tensile strength | Rm | = | MPa | |||
| Strain hardening exponent | n | = |
Calc 1
Minimum elongation for onset of yielding1110
Material characteristics, e.g. from the table for example materials.
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 / …