Everyone likes to have a rule of thumb to use as a quick and easy guide. To best use these maxims, it helps to understand where they came from and the limitations in their use. When it comes to taking the right steps to ensure a robust stamping process, the preferred approach is to conduct a surface-strain analysis generating a forming limit diagram (FLD). For most steel parts, the forming limit curve (FLC) should be based on the minimum allowable thickness and either the lower mill production limit or the minimum value allowed within the relevant material specification for the strain-hardening exponent (n-value). We should use the FLC provided by the material supplier for parts made from advanced high-strength steels, aluminum alloys or stainless-steel grades.
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