Plastic deformation and forming behavior of high strength aluminum alloys for automotive applications

汽车用高强度铝合金的塑性变形和成形行为

• 批准号: RGPIN-2017-06293
• 负责人: Jain, Mukesh
• 金额: $ 2.04万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=682690
• 关键词: Plastic; deformation; forming; behavior; strength

***The forming of low strength automotive aluminum alloys is relatively common for automotive body panels. The use of high strength aluminum alloys in forming applications to create automotive structures, however, has been a challenging problem in the past due to their lower formability. There has been renewed interest in these alloys due to the need for further weight reduction of automobiles to address automotive emission related environmental concerns. A fundamental understanding of the relationship between microstructure and formability, critical to the development and use of these alloys, is needed. This proposed research program is intended to fill this gap. ***The proposed research program deals with experimental and computational modeling studies at the scale of material microstructure on two high strength aluminum (HSA) sheet alloys, X615 and AA7075. The proposed study will characterize the 3D microstructures of these alloys in terms of grain and particle structure, perform mechanical tests at the scale of the microstructure, and develop relationship between microstructure and plastic flow, formability, and fracture of these materials. This study will make use of experimental techniques that are capable of quantifying 3D microstructures and spatial strain distributions in the vicinity of microstructural heterogeneities. The microstructure will be represented by statistically significant parameters and analyzed by modern statistical analysis tools. In addition, 3D spatial nature and constitutive properties of microstructural constituents will be incorporated into advanced computational models to systematically explore the role of microstructure constituents on plastic flow, formability, damage, and fracture behavior of test specimens and components made from HSA sheet materials. The computational model based on the FE method will be used to guide material development and prediction of forming performance of HSA sheet materials. Additionally, the computational models will be able to systematically evaluate the role of individual microstructural parameters on material deformation and damage behaviour in a parametric study. Such studies are costly and difficult to carry out experimentally due to precise control of the microstructure. ***The modeling study will lead to a better understanding of micro-scale mechanics of strain accommodation and localization, damage, and failure processes in high strength aluminum alloys. The results of the modeling study will accelerate further development of existing HSA and other sheets to provide better formability and service life of lightweight automotive aluminum parts, as well as provide clear guidelines for material selection for automotive part forming.

***低强度汽车铝合金的形成对于汽车车身面板相对常见。然而，由于它们的形成性较低，因此使用高强度铝合金在形成应用程序以创建汽车结构的应用中一直是一个具有挑战性的问题。由于需要进一步减轻汽车的体重来解决与汽车排放相关的环境问题，因此对这些合金产生了兴趣。需要对微观结构与形成性之间关系的基本理解，这对于这些合金的开发和使用至关重要。该建议的研究计划旨在填补这一空白。 ***拟议的研究计划介绍了两种高强度铝（HSA）合金（X615和AA7075）上材料微观结构规模的实验和计算建模研究。拟议的研究将以这些合金的3D微结构在晶粒和颗粒结构上，在微观结构的尺度上进行机械测试，并在微结构与塑性流，可将这些材料的骨折之间发展关系。这项研究将利用能够在微结构异质性附近量化3D微结构和空间应变分布的实验技术。微观结构将由统计学上的显着参数表示，并通过现代统计分析工具进行分析。此外，将将微观结构成分的3D空间性质和本构性特性纳入高级计算模型中，以系统地探索微结构成分对塑性流，形成性，损伤和测试样品的骨折行为以及由HSA板材料制成的组件的作用。基于FE方法的计算模型将用于指导材料开发和形成HSA材料材料性能的预测。此外，在参数研究中，计算模型将能够系统地评估单个微结构参数对材料变形和损伤行为的作用。由于对微观结构的精确控制，此类研究是代价高昂且难以在实验上进行的。 ***建模研究将使高强度铝合金中的应变适应和定位，损伤和故障过程的微尺度力学更好地理解。建模研究的结果将加速现有的HSA和其他床单的进一步开发，以提供轻巧的汽车铝制零件的更好的外观性和服务寿命，并为汽车零件形成的材料选择提供明确的指南。