CAREER: Fundamentals of Modeling Deformation Twinning in Polycrystalline Materials Driven by Diffraction-Based Micromechanical Data

职业:基于衍射的微机械数据驱动的多晶材料变形孪生建模基础

基本信息

  • 批准号:
    2143808
  • 负责人:
  • 金额:
    $ 52.46万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2022
  • 资助国家:
    美国
  • 起止时间:
    2022-08-15 至 2027-07-31
  • 项目状态:
    未结题

项目摘要

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). NON-TECHNICAL SUMMARYStructural components in modern automobiles and aircraft are tasked with performing under increasingly strenuous conditions to reduce weight and increase efficiency. This requires a higher confidence in understanding the strength of materials, which is used directly by engineers to design safe, long-lasting components. In metals, atoms are arranged in a structured, periodic way. Changes in the arrangement of these atoms due to an applied force influences the strength of metals. These regions of disruption among atoms are known as defects. This study aims to develop a better understanding of why and how these phenomena occur in order to better predict how and when metal components will fail. This project pairs experimental observations with high-fidelity simulations to formulate a predictive model. This model forms the basis of a state-of-the-art simulation software to increase fundamental understanding of metals at their microscopic levels, to better predict their strength and ultimately design safer machines and new materials. The software developed in this study is disseminated free and open-source, with an interactive website devoted to teaching others how to use it and incorporated into undergraduate and graduate-level coursework. Additional outreach activities include yearly instructional workshops to guide users through the theory and operation of the simulations to encourage a wider, more diverse community of users. The workshops specifically recruit undergraduate students to foster on-campus research experiences and provide a pipeline of students to graduate school. TECHNICAL SUMMARY Modern engineering components are increasingly tasked with more strenuous performance demands, including operating under conditions closer to their failure limits. This necessitates a fundamental understanding of the various types of micromechanical responses of metallic alloys. While deformation twinning has been observed in many high-strength structural alloys, the mechanisms which govern their behavior are not well understood compared to crystallographic slip. Common models obscure the differences between twinning and crystallographic slip by homogenizing their local deformation response, ignoring the discrete nature of twinning; consequently, there is no universally accepted model describing deformation twinning. This study aims to formulate a phenomenological model governing the behavior of discrete deformation twinning at the grain scale to provide for better predictive models for the deformation of polycrystalline materials through a correlated experimental-theoretical approach. High energy X-ray diffraction experiments are performed in situ to track the evolution of plasticity (specifically the nucleation and evolution of deformation twins) at the grain scale during deformation loading. The analysis of this experimental data allows for formulating a phenomenological model governing the behavior of twinning at the grain scale and implementing this model into a refined crystal plasticity finite element framework that considers discrete deformation twin regions. The software developed in this study is disseminated free and open-source, with an interactive website devoted to operational instruction, and is included in undergraduate and graduate-level coursework. Additional outreach activities include yearly instructional workshops to guide users through the theory and operation behind the simulations to encourage a broader, more diverse community of users. The workshops specifically recruit undergraduate students to foster on-campus research experiences and provide a pipeline of students to graduate studies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
该奖项全部或部分根据2021年美国救援计划法案(公法117-2)资助。非技术总结现代汽车和飞机中的结构部件的任务是在越来越艰苦的条件下执行,以减轻重量并提高效率。这就需要对材料强度有更高的信心,工程师可以直接使用材料强度来设计安全、耐用的部件。在金属中,原子以结构化的周期性方式排列。这些原子排列的变化由于施加的力影响金属的强度。这些原子间的分裂区域称为缺陷。这项研究旨在更好地了解这些现象发生的原因和方式,以便更好地预测金属部件何时以及如何发生故障。该项目将实验观察与高保真模拟配对,以制定预测模型。该模型构成了最先进的模拟软件的基础,以增加对金属微观水平的基本了解,更好地预测其强度,并最终设计更安全的机器和新材料。在这项研究中开发的软件是免费和开源的,有一个互动网站,专门教别人如何使用它,并纳入本科和研究生课程。其他外联活动包括每年举办一次指导讲习班,指导用户了解模拟的理论和操作,以鼓励更广泛、更多样化的用户群体。这些研讨会专门招收本科生,以促进校园内的研究经验,并提供学生到研究生院的管道。现代工程部件越来越多地承担着更苛刻的性能要求,包括在更接近其故障极限的条件下运行。 这需要对金属合金的各种类型的微观力学响应有基本的了解。虽然在许多高强度结构合金中观察到了变形孪晶,但与晶体学滑移相比,控制其行为的机制还没有得到很好的理解。常见的模型模糊了孪晶和晶体学滑移之间的差异,忽略了孪晶的离散性,忽略了它们的局部变形响应;因此,没有普遍接受的模型来描述变形孪晶。本研究的目的是制定一个唯象模型的离散变形孪晶在晶粒尺度上的行为,提供更好的预测模型的变形多晶材料通过相关的实验-理论方法。 高能X射线衍射实验进行原位跟踪塑性的演变(特别是变形孪晶的成核和演变)在变形加载过程中的晶粒尺度。这个实验数据的分析允许制定一个唯象模型,在晶粒尺度上的孪生行为,并将此模型实施到一个精细的晶体塑性有限元框架,认为离散变形孪晶区域。在这项研究中开发的软件是免费和开放源码的,有一个互动的网站,专门用于操作教学,并被列入本科和研究生一级的课程。其他外展活动包括年度教学研讨会,指导用户了解模拟背后的理论和操作,以鼓励更广泛、更多元化的用户社区。这个奖项反映了NSF的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Matthew Kasemer其他文献

Orientation reconstruction of transformation emα/em titanium alloys via polarized light microscopy: Methodology and assessment
通过偏振光显微镜对变形α/α'钛合金的取向重构:方法和评估
  • DOI:
    10.1016/j.matchar.2025.114841
  • 发表时间:
    2025-04-01
  • 期刊:
  • 影响因子:
    5.500
  • 作者:
    Amit Singh;Mark Obstalecki;Darren C. Pagan;Michael Glavicic;Matthew Kasemer
  • 通讯作者:
    Matthew Kasemer

Matthew Kasemer的其他文献

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