Research On Material Model Of AA6016 Aluminum Alloy Under Hot Forming

Due to its process characteristics,aluminum alloy hot stamping can produce high-strength,high-precision,and complex-shaped body parts,making it possible for aluminum alloys to be widely used in automobile bodies.However,the mechanics and failure behavior of aluminum alloy hot stamping forming process are different from the traditional room temperature forming process.At the same time,the traditional theoretical prediction method of forming limit based on room temperature is not enough to effectively predict the forming performance of parts under hot stamping forming condition.Therefore,it is of academic and engineering significance to study the hot stamping properties of aluminum alloys and establish models that can predict their forming defects.In this thesis,the mechanical behavior of AA6016 aluminum alloy under hot stamping conditions is analyzed.Based on M-K model,a suitable constitutive relationship and yield criterion are used to establish a forming limit prediction model suitable for hot stamping conditions.Provide guidance on actual production.The main research contents and conclusions of this article are as follows:(1)Based on the solution treatment temperature and the quenching sensitive temperature,the temperature range of hot stamping was determined to be 350℃-560℃,and a reasonable hot-drawing experiment scheme was formulated.(2)The mechanical behavior of AA6016 aluminum alloy under hot stamping conditions was studied through hot tensile experiments.The results show that the effect of temperature on yield strength,elongation and anisotropy is far greater than the strain rate.(3)Based on the M-K theory,a forming limit prediction model of AA6016 aluminum alloy under hot stamping forming conditions is established,and the accuracy of the prediction model is verified by experimental data of forming limit in the literature.(4)Calculate and analyze the influence of different factors on the theoretical forming limit using the derived forming limit prediction model.The results show that the effect of temperature on the forming limit is much greater than the strain rate.The effect of the strain rate sensitivity index on the forming limit is greater than the hardening index.The forming limit increases exponentially with the increase in the initial thickness unevenness.