Forming limit curves of AA۳۱۰۵ on multiple temperature conditions: numerical investigation and experimental verification

In this paper, Forming Limit curves (FLCs) of AA۳۱۰۵ aluminum alloy sheet were obtained at four different temperatures using the Nakazima test. A novel approach based on the Nakazima test was applied to fabricate the experimental setup for determining forming limit diagrams (FLDs) at elevated temperatures. First, the Nakazima-die-set was manufactured, and a thermal system was prepared for increasing sheet and die’s temperature; then AA۳۱۰۵ samples were tested at four different temperatures experimentally. Moreover, the ABAQUS finite element software was employed. Three different criterions including the ۲nd order of derivatives for major strain, equivalent plastic strain, and thickness strain were applied to estimate the onset of localized necking. The numerical results were verified by experiment. Both the experimental and finite element method results illustrated that the level of the forming limit diagram for the aluminum sheets improved by increasing its temperature. The forming limit improvement was not equal in every strain paths.

کلیدواژه ها:

Sheet Metal Forming ، Forming Limit Diagram ، Elevated Temperature ، AA۳۱۰۵ ، Finite Element Method