Determination of Forming Limits in Automotive Stampings
650535
02/01/1965
- Event
- Content
- Forming limits are determined by analyzing strain distributions obtained from 0.2–0.05 in. grids imprinted on blanks by photographic or electrochemical marking techniques. Failure generally occurs in a region of stretch forming where all strains are positive (tensile) in the plane of the sheet. Experimental results derived from laboratory specimens and production automotive stampings indicate a predictable critical strain level beyond which failure is anticipated. The most effective method of increasing the stretching limits is the development of a more nearly uniform strain distribution. Factors controlling this distribution are material strain hardening characteristics, die design, stamping geometry, and lubrication.
- Pages
- 9
- Citation
- Keeler, S., "Determination of Forming Limits in Automotive Stampings," SAE Technical Paper 650535, 1965, https://doi.org/10.4271/650535.