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Published in:
2011 | OriginalPaper | Chapter
11. Speed Effects
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Abstract
The forming speed affects the forming operation by (in order of increasing magnitude): inertia effects, metallurgical effects, and tribological effects. Metallurgical effects (strain-rate hardening) can lower the uniform strain in a tensile test but slow down the development of necks. Enhanced formability in true high-speed forming operations however are not caused by strain-rate hardening, but by secondary inertia effects. At extreme speeds the formability can also be increased by viscous drag.