Forming Limit Diagram Of Metal Sheet In Actual Strain Path With Respect To Forming Process
Author(s)
M. Shakeri, B.M. Dariani & A. Sadough
Abstract
Forming limit diagram of metal sheet in actual
strain path with respect to forming process
M. Shakeri, B.M. Dariani & A.Sadough
Mechanical Engineering Department, Amirkabir University of
Technology, Tehran, Iran.
Abstract
Sheet metal forming is generally limited by plastic instability in the form of
diffuse necking followed by localized necking and final failure. The forming limit
diagram (FLD) is dependent upon the material properties such as strain
hardening exponent (n), strain rate sensitivity parameter (m), Anisotropy
parameter (r), grain size as well as strain path. Since the actual strain path in the
sheet metal forming is not always linear, thus the FLDs that are obtained
throughout linear strain path do not have good agreement with experiments. In
this paper the FLD of sheet is obtained throughout actual strain path (nonlinear)
in both theoretical and experimental approaches. In the theoretical analysis, a
localized necking model is used and a "many slices" approach i
Keywords
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