A New Calibration Method for FLCs in the M-K Frame-Work

Abstract

The main drawback of the method proposed by Marciniak and Kuczynski for prediction of the limit strains in sheet metal forming processes is requirement of an experimental point of the forming limit curve (FLC) in order to calibrate the curve. The purpose of this work is to introduce a new method to calibrate the FLC using the M-K model in which no experimental data is needed. To achieve this goal, many experimental FLCs were collected from the literature and the values of the initial inhomogeneity factors were determined for them with trial and error aproach. Using these data, an empirical law was developed to predict the value of inhomogeneity factor. The resultant curves show good agreement with the experiments.

A Modified M-K Method for Accurate Prediction of FLC of Aluminum Alloy

“…It is widely used because of its simplicity and high precision, and its original model has already been improved significantly by scholars. For further researches on the M-K method, the angle between the groove and direction of the principal stress has been introduced in prediction [11][12][13][14]. Although scholars have done a lot of research on it, there are still some disadvantages.…”