1. Different deformation modes
Sheet metals are very sensitive to the mode of deformation applied to them. For a given material, the forces required, as well as the deformation capacities, can differ profoundly from one mode to another, which is why we will approach the study of sheet metal formability by defining these different modes, using the terminology conventionally used in deep drawing.
1.1 Part examination
Figure 1 shows a simple part, a timing chain housing, which we'll use to identify the main deformation modes.
The starting point is a piece of sheet metal pre-cut to the desired shape, which is then called a blank (dashed line on figure
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Different deformation modes
Forming limit curves
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