CAREER: Innovations in Microscale Plasticity and Failure Mechanics to Enable Microforming Processes, with Bending and Hydroforming as Paradigms

职业：以弯曲和液压成形为范例的微尺度塑性和失效力学创新，以实现微成形工艺

• 批准号: 1150523
• 负责人: Ioannis Korkolis
• 金额: $ 40万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-01 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1150523&HistoricalAwards=false
• 关键词: CAREER; Innovations; Microscale; Plasticity; Failure

This Faculty Early Career Development (CAREER) grant aims at enhancing the understanding of deformation and failure of microtubes (diameter 1mm) with few (10) grains through the thickness. Such components abound in microelectronic, microfluidic and biomedical applications. Their mechanical behavior is dominated by the limited number of through-thickness grains, which renders the continuum approximation unsuitable. In this research, stainless steel 304 and CuZn 30 brass microtubes will be inflated under internal pressure and axial load and taken to failure, using a testing machine to be created for this purpose. These experimental findings will then help establish a microstructurally-informed, crystal plasticity constitutive model, with the aid of the research partner in South Korea. Finite element simulations of the experiments will be coupled with this material model to capture the deformation and failures observed. Subsequently, two micromanufacturing processes (microtube bending and hydroforming) will be examined using a combination of experiments and analysis. A microtube bending device will be created for the purposes of this project, while an existing apparatus in Cologne, Germany, will be used for the microtube hydroforming experiments. The performance of the numerical and constitutive models established above will be examined in light of these experiments and will be improved as needed, to capture the failures observed. If successful, this research will contribute to the scientific understanding of grain-dominated deformation and failure of materials. It will enable the broader implementation of microtube bending and hydroforming in innovative microelectronic, microfluidic and biomedical products, benefiting the American industry. The award will also provide two graduate students with the opportunity to perform research for a total of 18-24 months in Germany and South Korea, preparing them well for the globalization of research and industry. Lastly, training and integrating minorities will result in a more diverse, fair and internationally competitive workforce.

该学院早期职业发展（CAREER）资助旨在提高对微管（直径1 mm）变形和失效的理解，其中厚度很少（10）颗粒。此类组件在微电子、微流体和生物医学应用中大量存在。它们的力学行为主要由有限数量的贯穿厚度的晶粒决定，这使得连续近似不合适。在这项研究中，不锈钢304和铜锌30黄铜微管将在内部压力和轴向载荷下膨胀并失效，使用为此目的而创建的试验机。这些实验结果将有助于在韩国研究合作伙伴的帮助下建立一个微观结构的晶体塑性本构模型。实验的有限元模拟将与该材料模型相结合，以捕获观察到的变形和失效。随后，两个微制造工艺（微管弯曲和液压成形）将使用实验和分析相结合的检查。一个微管弯曲装置将创建用于本项目的目的，而现有的设备在科隆，德国，将用于微管液压成形实验。上述建立的数值和本构模型的性能将根据这些实验进行检查，并根据需要进行改进，以捕获观察到的故障。如果成功，这项研究将有助于科学地理解材料的晶粒主导变形和破坏。它将使微管弯曲和液压成形在创新的微电子，微流体和生物医学产品中得到更广泛的应用，使美国工业受益。该奖项还将为两名研究生提供在德国和韩国进行为期18-24个月的研究的机会，为研究和产业的全球化做好准备。最后，培训和融合少数群体将产生更加多样化、公平和具有国际竞争力的劳动力队伍。