车用轻量化铝合金材料本构关系研究进展

Progress in Constitutive Relationship Research of Aluminum Alloy for Automobile Lightweighting

综述了车用轻量化铝合金材料塑性流变行为的建模。随着成形技术与设备的进步,铝合金的成形方式已不再局限于传统的冷成形,热成形与高速成形的新工艺不断涌现,对本构模型的准确性要求也不断提高。由此,高温下材料的本构关系已成为研究的热点,并进一步将微观组织结构的演变包括位错运动和损伤演化等耦合到本构模型中,提高了本构模型的准确性。这些模型被证明能够较好地描述材料的塑性流变行为。

The progress of modeling the plastic rheological behavior of aluminum alloy which can be used for automobile lightweighting is reviewed. With the development of forming technology and equipment, the forming methods of aluminum alloy are not confined to traditional cold forming any more. The technology of hot forming and high-velocity forming continuously appears and the requirement for the accuracy of constitutive model is improving. In consequence, the constitutive relationship of aluminum alloy at elevated temperature becomes a research focus and microstructure evolution is incorporated into constitutive model in order to improve its accuracy, including the dislocation movement and damage evolution. These models are proved to be able to describe the plastic rheological behavior of materials well.