چكيده به لاتين
Abstract:
In the last few decades, the use of materials that have unique and significant physical properties has expanded. Materials with the fine-grained structure are such materials that their high strength at ambient temperature and high corrosion resistance give them great attention. Such materials can be produced by the use of severe plastic deformation (SPD). On the other hand, given the high importance of these materials, predicting failure in these metals is also an important issue for researchers.
In this research aluminum alloy 1050 (AA 1050) sheet produced by Accumulative Roll Bonding (ARB) is used as the main material due to its high use in industry. The forming limit diagram (FLD) of the fine-grained aluminum sheet is obtained using the Nakazima test. The Gurson-Tvergaard-Needleman (GTN) ductile damage model is used to predict sheet failure and obtain its FLD using ABAQUS software. The GTN damage model is based on the nucleation and growth of voids in the material during deformation. This damage model has nine basic parameters that obtaining them through experimental tests, is time-consuming and costly and in some cases impossible. For this purpose, the present study tries to obtain the above parameters for fine-grained aluminum 1050 fabricated by ARB using finite element method. Therefore, after considering the interval for each parameter, anti-inference method and numerical simulation of the uniaxial tensile test is used for identification of GTN parameters for AA 1050 sheet using FEM. Proper parameters of GTN model is imported to the FEM of Nakazima test for FLD prediction. Finally, numerical and experimental FLDs were compared for validation.
Keywords: Accumulative Roll Bonding (ARB) - Forming Limit Diagram (FLD) – Finite Element Method (FEM) – Response surface method (RSM) - GTN Damage Model.
