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Forming-Analysis
2.7
FLC RR St14
203 Articles  2254 Elements

FLC RR St14

2.7
FLC RR St14
Fig. 1
Forming limit curve FLC RR St14 different sheet thicknesses19

The limit curves are shifted to higher φ1 values for thicker sheets.

Eqn. 1
\require{color}\definecolor{myred}{RGB}{255,0,0} \varphi_{\color{myred}1}=\ln\left(\frac{l_{\color{myred}1}}{d}\right),\varphi_{\color{myred}2}=\ln\left(\frac{l_{\color{myred}2}}{d}\right),\varphi_{\color{myred}3}=-\varphi_{\color{myred}1}-\varphi_{\color{myred}2}
Eqn. 2
\require{color}\definecolor{myred}{RGB}{255,0,0} \varepsilon_{\color{myred}n}=\left(e^{\color{myred}\varphi_{\color{myred}n}}-1\right)\cdot100
Eqn. 3
\require{color}\definecolor{myred}{RGB}{255,0,0} s_{\color{myred}1}=s_{\color{myred}0}\cdot\left(1+\frac{\varepsilon_{\color{myred}3}}{100}\right)
Natural strainφ1=0.41 
φ2=0 
φ3=-0.41 
Elongationε1=50% 
ε2=0% 
ε3=-33.3% 
Sheet thicknesss1=0.67mm 
Lengthl1 = 7.5mm
l2 = 5mm
Circle diameterd = 5mm
Sheet thicknesss0 = 1mm
7.50
Calc 1
True strains to the circle element
19
Lange / Umformtechnik Blechbearbeitung / Springer Verlag / Berlin / 1990 / 2. Auflage
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