Prediction of limit drawing ratio in deep drawing process of Mg alloy AZ31 using Fuzzy Logic

Abstract

The interest in magnesium alloys has progressively increased in several industrial fields in recent years, and AZ31 has become an object of study for lightweight development. Due to its low density and high specific strength, magnesium alloys represent a promising alternative to aluminum alloys and high-strength steels, especially for automotive industry applications, where they are used in structural components to reduce weight and improve fuel efficiency. In recent decades, several tests were conducted to evaluate the formability of AZ31, showing its high dependency on the temperature range. The main objective of the present study is to propose a fuzzy model to predict the limit drawing ratio (LDR) of an AZ31 sheet by varying its thickness, temperature, and speed in wide ranges. To validate the proposed model, comparisons were made with 6 studies performed by other authors – covering 46 experimental tests – showing a very good agreement between experimental results and fuzzy results. The model predicts the limit drawing ratio with an accuracy of 92.1%.