2. Forming limit curves
2.1 Representation of deformations
To make the preceding notions more quantitative, we measure local deformations and plot them on a graph, generally observing the following conventions:
main deformation (index 1): the largest in algebraic value, it determines the main direction of deformation;
secondary deformation (index 2): the smallest in algebraic value. In practice, the secondary direction is considered to be perpendicular to the previous one.
As we have seen, deformations can be expressed in percent (conventional deformation e ) or in rational form (ε ). The former is preferred in the workshop, while the latter is used for more...
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Forming limit curves
Characterization of sheet metal formability
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