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Forming Limit Diagram Generation

With your forming limit curve (FLC), you know how much deformation you can subject your sheet metal to before it necks/splits. But just what type of deformation are you doing to your sheet metal? Using the techniques of surface strain analysis (either circle grid or square grid) and thinning strain analysis, you can quantitatively determine the strains your forming process imparts on the sheet. Plotting these strains along with the metal's forming limit curve creates what is called a Forming Limit Diagram (FLD).

If your forming strains are sufficiently below the metal's FLC, congratulations, you have a "safe part", and your forming conditions are sufficiently robust to handle the normal and expected variation in sheet metal properties. If your forming strains are not below the FLC, then at least you now have a graphical representation of where trouble can occur if "low end" properties are shipped in. How do you attack these issues before they turn into problems?

Contact EQS for help!