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.*****

越来越严格的燃油经济性和排放标准驱动了汽车行业提高车辆效率，以实现Obama政府规定的54.5 MPG（到2025年）的公司平均燃油经济性（CAFE）目标。这刺激了车辆光重量领域的研发活动最近大幅增加，并有望在实现CAFE目标方面发挥关键作用。轻巧技术的实施取决于先进的制造工艺和新型材料，以产生功能性且保持高碰撞标准的车辆结构组件。重点关注金属形成的一些当前和新兴的轻巧技术包括（i）量身定制的钢（ii）高强度铝制的热压和热冲压，以及（iii）第三代Q＆P钢的常规冲压。这些轻巧的加权技术及其相关的材料是拟议的发现研究计划的重点，该计划将研究温度形成升高和室温变形对这些材料微机械行为的影响。拟议的研究的目标将解决：****（1）相变，三轴性和温度变形升高对铝合金在温暖形成过程中铝合金的微机械行为的影响***（2）多数的影响相互作用和轻巧金属的损伤演变****（3）代表性体积元素（RVE）有限元模型的开发，以模拟轻质加权金属的测得的本构和断裂行为***将在纳米分辨率场发射扫描电子显微镜（FE-SEM）中进行ART ART机械测试，以研究（i）多相显微结构（II）温度（III）压力态（triaxiality）（IV）（IV）（IV）（IV） ）应变速率和（v）对这些材料微机械行为的相位转换。然后，实验结果将导致RVE有限元模型的开发，以模拟这些轻巧加权过程的本构和断裂行为。表征结果和RVE模型将由行业（材料生产商，零件制造商，汽车制造商）采用，以改善先进的制造工艺并增强轻度加权零件的服务性能。长期，车辆轻巧将通过减少的排放来使我们的健康和环境受益，而轻巧技术的发展也将通过确保加拿大作为高级制造商的实力来使我们的经济受益。***** *****