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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
IJEMS Vol.17(4) [August 2010] >
| Title: | Calculation of Lankford coefficient from orientation distribution function and modelling of forming limit diagram using Marcniak-Kuczynski hypothesis of geometric instability |
| Authors: | Raj, A Kanni |
| Keywords: | Orientation distribution function (ODF)
Aluminium killed extra deep drawing (AK-EDD) steel sheet
Forming limit diagram (FLD)
Texture
Formability
Instability
Anisotropy |
| Issue Date: | Aug-2010 |
| Publisher: | CSIR |
| Abstract: | Complex
stampings are developed with the aid of data obtained from laboratory tensile
test and average plastic strain ratio that enables the press formability of sheet
metals to be reliably predicted. Formability is best assessed by Hecker’s
method of punch stretching and drawing the forming limit diagrams.
Analytically, the forming limit diagrams are modeled by geometric instability
analyses based on Marciniak & Kuczynski with a high degree of accuracy.
Also, texture analysis is used to get average plastic anisotropic ratio input
parameter to the above model. In the present research, texture is determined by
measuring four incomplete pole figures of the planes {110}, {200}, {112} and
{103} using Schulze back reflection technique. This analysis provided
orientation distribution function which is in turn used to calculate average
plastic anisotropic ratio. The data from texture and others experiments, such
as tensile test, roughness measurement and density measurement are used in the
analytical model to get forming limit diagrams. The theoretical forming limit
diagrams obtained show significant departure from the experimentally evaluated
ones only in plain strain condition. |
| Page(s): | 256-264 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.17(4) [August 2010]
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