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Surface Thinning and Strain Characteristics

Every sheet metal has a limit to how much it can be stretched or drawn before it necks or cracks. Every part puts stresses and strains into the sheet metal. Only when the strains from the sheet forming operation are below the sheet metal forming limit can a part/process be thought of as robust. Surface and thinning strain analysis are techniques that are combined with Forming Limit Diagrams that can assess your forming process and show if you can expect split-free and neck-free performance over the entire range of material properties.