Investigation of the Micro-Mechanical Phenomena Operative during Elevated Temperature Forming and in the As-Received (and As-Formed) Condition of Novel Automotive Light Weighting Metals

新型汽车轻质金属高温成形过程中以及收到（和成形）状态下的微机械现象研究

• 批准号: RGPIN-2017-05195
• 负责人: Bardelcik, Alexander
• 金额: $ 1.68万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=644637
• 关键词: Investigation; Micro; Mechanical; Phenomena; Operative

Increasingly stringent fuel economy and emissions standards have driven the automotive industry to improve vehicle efficiency in an effort to meet the corporate average fuel economy (CAFE) target of 54.5 mpg (by 2025) as mandated by the Obama administration. This has spurred a recent and significant increase in R&D activity in the field of vehicle light weighting and is poised to play a key role in meeting the CAFE targets. Implementation of light weighting technologies depends on advanced manufacturing processes and novel materials to produce vehicle structural components that are both functional and maintain high crashworthiness standards. Some of the current and emerging light weighting technologies that focus on metal forming include (i) tailored hot stamping of steels (ii) warm forming and hot stamping of high strength aluminum and (iii) conventional stamping of 3rd Generation Q&P steels. These light weighting technologies, and the materials associated with them, are the focus of the proposed Discovery research program, which will investigate the effect of elevated temperature forming and room temperature deformation on the micro-mechanical behaviour of these materials. The objectives of the proposed research will address:****(1) The effect of phase transformations, triaxiality and elevated temperature deformation on the micro-mechanical behaviour of aluminum alloys during warm forming***(2) The effect of multi-phase interaction and damage evolution of light weighting metals****(3) The development of representative volume element (RVE) finite element models to simulate the measured constitutive and fracture behaviour of the light weighting metals***State-of-the-art in-situ mechanical testing will be conducted within a nanometer resolution field emission scanning electron microscope (FE-SEM) to investigate the effect of (i) multi-phase microstructures (ii) temperature (iii) stress-state (triaxiality) (iv) strain rate and (v) phase-transformations on the micro-mechanical behavior of these materials. The experimental results will then lead to the development of RVE finite element models to simulate the constitutive and fracture behavior of these light weighting processes metals. The characterization results and RVE models will be adopted by industry (material producers, parts manufacturers, car makers) to improve the advanced manufacturing processes and enhanced the in-service performance of light weighted parts. Long term, vehicle light weighting will benefit our health and the environment through reduced emissions and the advancement of light weighting technologies will also benefit our economy, by securing Canada's strength as advanced manufacturers.*****

日益严格的燃料经济性和排放标准已经驱使汽车工业提高车辆效率，以努力满足奥巴马政府授权的54.5 mpg（到2025年）的企业平均燃料经济性（CAFE）目标。这促使最近在车辆轻量化领域的研发活动显著增加，并准备在实现CAFE目标方面发挥关键作用。轻量化技术的实施依赖于先进的制造工艺和新型材料，以生产功能性和高耐撞性标准的车辆结构部件。目前和新兴的一些专注于金属成形的轻量化技术包括（i）钢的定制热冲压（ii）高强度铝的温成形和热冲压以及（iii）第三代Q&P钢的常规冲压。这些轻量化技术以及与之相关的材料是Discovery研究计划的重点，该计划将研究高温成形和室温变形对这些材料微观力学行为的影响。拟议研究的目标将涉及：* （1）相变的影响，三维度和高温变形对铝合金温成形过程中微观力学行为的影响 ***（2）多相相互作用和轻质金属损伤演化的影响 ****（3）开发代表性体积元（RVE）有限元模型，以模拟轻质金属的实测本构和断裂行为 *** 将在纳米分辨率场发射扫描电子显微镜（FE-SEM）内进行最先进的原位力学测试，以研究（i）多相微观结构（ii）温度（iii）的影响应力状态（三轴性）（iv）应变速率和（v）相变对这些材料的微观机械行为的影响。实验结果将导致RVE有限元模型的发展，以模拟这些轻质工艺金属的本构和断裂行为。表征结果和RVE模型将被行业（材料生产商，零件制造商，汽车制造商）采用，以改进先进的制造工艺，提高轻量化零件的使用性能。从长远来看，车辆轻量化将通过减少排放有利于我们的健康和环境，轻量化技术的进步也将通过确保加拿大作为先进制造商的实力而有利于我们的经济。