Forming limit curves
Metal sheet drawing - Importance of deformation modes
Article REF: BM7510 V2
Forming limit curves
Metal sheet drawing - Importance of deformation modes

Author : Alain COL

Publication date: October 10, 2011 | Lire en français

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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 (e ). The former is preferred in the workshop, while the latter is used for...

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