MCG 4328 Lecture Notes - Lecture 1: Forming Limit Diagram, Tensile Testing, Work Hardening

• School: University of Ottawa
• Department: Mechanical Engineering
• Course: MCG 4328
• Professor: Fabio Variola

Document Summary

Changing the shape of a sheet material (no significant change in thickness occurs) Used to manufacture final components without following deformation. Economical mass prod (ex: automobiles, airplanes, railway cars) Metal inside of na = compressed; outside na stretched. Forming of sheet into convex/concave shapes beverage cans. Sheet metal clamped along edges and stretched over a male die (form block) Punching: similar to blanking except cut piece is scrap/slug. Shearing: cut along a straight line between two cutting edges. During cutting: punch causes plastic deformation penetration fracture. Rollover: region at top of cut surface. Fracture zone: rough surface, downward movement of punch makes fracture. Burr: sharp corner on edge caused by metal elongation during separation. Ability to undergo desired shape change without failure or defects. Large region of uniform deformation is desired. Localized thinning from non-uniform thickness across part, this can lead to failure similar to necking in tensile tests.