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Simulation of aluminium sheet forming at elevated temperatures

机译：高温下铝板成型的模拟

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摘要

The formability of aluminium sheet can be improved by increasing the temperature in some parts of the sheet and cooling other parts. Simulation of this process requires an accurate material model for the yield function and the temperature and strain-rate dependent hardening. In simulations of cylindrical cup deep drawing, the quadratic Hill yield criterion results in too much thinning in the bottom of the cup. The Vegter yield function is more flexible and gives better predictions. The model for work hardening and the temperature and strain-rate sensitivity needs to be accurate over the complete temperature range between the cooled and the heated parts of the sheet. It is demonstrated that the Bergstroem model is able to model the flow stress of Al-Mg alloys up to 200 °C and medium strain rates. For higher temperatures and low strain rates the deviations with experiments increase.
机译：铝板的可成形性可以通过提高板的某些部分的温度并冷却其他部分来提高。此过程的仿真需要用于屈服函数以及与温度和应变率有关的硬化的精确材料模型。在圆柱杯深拉的模拟中，二次Hill屈服准则会导致杯底变薄太多。 Vegter屈服函数更灵活，并且可以提供更好的预测。在板材的冷却部分和加热部分之间的整个温度范围内，用于加工硬化以及温度和应变率敏感性的模型需要准确。证明了Bergstroem模型能够对高达200°C和中等应变速率的Al-Mg合金的流应力进行建模。对于较高的温度和较低的应变率，实验偏差会增加。

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