CAREER: On the Engineering of Light Metals for Enhanced Dynamic Properties and Fatigue Performance

职业：关于增强动态性能和疲劳性能的轻金属工程

• 批准号: 1151588
• 负责人: Diana Lados
• 金额: $ 52.5万
• 依托单位: Worcester Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1151588&HistoricalAwards=false
• 关键词: CAREER; Engineering; Light; Metals; Enhanced

TECHNICAL SUMMARY:The goal of this CAREER award to Worcester Polytechnic Institute is to build and integrate fundamental knowledge of materials science and fracture mechanics to aid in the optimization of existing light metal alloys and the development of new and lighter alloys designed for improved fatigue and fatigue crack growth resistance in structural applications. This research will also lead to the creation of original experimental, analytical, and computational tools and strategies for accurate fatigue life predictions and design of fatigue-critical and high-integrity structural components. The proposed work will provide a fundamental understanding of the fatigue crack growth mechanisms at the micro-/nano-structural scale of light metals, as well as methods for improved design. In addition to their contributions to the scientific community, the results of this work will also impact the industry -- both the materials and processing and design communities. On a larger scale, complementary to the improvements in materials design and fatigue performance, these developments will contribute to important reductions in fuel consumption and carbon emissions.NON-TECHNICAL SUMMARY:Our nation's ambitious energy goals and reduced carbon pollution can only be achieved if the transition to renewable and clean energy will be complemented by effective venues to reduce vehicle weight. Weight reductions will translate into reductions in fuel consumption, and consequently, reductions in the carbon footprint. One way to reduce vehicle weight is to replace ferrous materials in structural components with well-engineered lighter metals. In structural components, the dynamic properties and fatigue performance of the materials are critical as more than 90% of all mechanical failures are fatigue related. Therefore, a transition to lighter metals in such applications needs to be based on a fundamental understanding and optimization of the fatigue behavior of the materials. Another means to reduce weight is to use accurate life prediction tools to design structural components with a higher degree of confidence, which requires appropriate fatigue data generation, interpretation, and use. This will allow applying sufficient yet not excessive safety factors, which will result in further weight and cost reductions. The CAREER award to Worcester Polytechnic Institute will support both fronts by providing a mechanistic understanding of fatigue in light metals, as well as methods for improved design. The ultimate goal of the work is to facilitate the design of better, lighter, and more reliable structural components for the transportation sector. Through direct collaborations with the industry, the knowledge, data, and techniques emerging from this work will be effectively validated and implemented. In the broader impact of this award, a wide spectrum of activities will be used to stimulate the interest and engagement in fundamental and applied science and materials science of a range of students from undergraduate and graduate to middle- and high-school to professionals.

技术摘要：伍斯特理工学院获得这一职业奖项的目标是建立和整合材料科学和断裂力学的基本知识，以帮助优化现有的轻金属合金，并开发新的和更轻的合金，旨在提高结构应用中的疲劳和疲劳裂纹扩展抗力。这项研究还将导致创造独创的实验、分析和计算工具和策略，用于准确的疲劳寿命预测和疲劳关键和高完整性结构部件的设计。这项拟议的工作将提供对轻金属微/纳米结构尺度上疲劳裂纹扩展机制的基本理解，以及改进设计的方法。除了他们对科学界的贡献外，这项工作的结果也将影响该行业--包括材料以及加工和设计社区。在更大的范围内，与材料设计和疲劳性能的改进相辅相成，这些发展将有助于重要的燃料消耗和碳排放的减少。非技术总结：只有在过渡到可再生和清洁能源的同时，有效地减轻车辆重量，才能实现我国雄心勃勃的能源目标和减少碳污染。重量减轻将转化为燃料消耗的减少，从而减少碳足迹。减轻车辆重量的一种方法是用设计精良的更轻的金属取代结构部件中的铁质材料。在结构部件中，材料的动态性能和疲劳性能至关重要，因为90%以上的机械故障与疲劳有关。因此，在这种应用中过渡到较轻的金属需要建立在对材料疲劳行为的基本了解和优化的基础上。另一种减重手段是使用精确的寿命预测工具，以更高的置信度设计结构部件，这需要适当的疲劳数据生成、解释和使用。这将允许应用足够而不是过多的安全系数，从而进一步降低重量和成本。伍斯特理工学院的职业生涯奖将通过提供对轻金属疲劳的机械理解以及改进设计的方法来支持这两个方面。这项工作的最终目标是促进为交通部门设计更好、更轻、更可靠的结构部件。通过与业界的直接合作，这项工作中产生的知识、数据和技术将得到有效的验证和实施。在该奖项的更广泛影响中，将利用广泛的活动来激发从本科生和研究生到初中和高中再到专业人员的一系列学生对基础科学和应用科学以及材料科学的兴趣和参与。