Collaborative Research: Understanding Acoustoplasticity through Multiscale Computational and In-Situ, Time-Resolved Experimental Approach

合作研究：通过多尺度计算和原位时间分辨实验方法了解声塑性

• 批准号: 2148646
• 负责人: Sunil Kishore Chakrapani
• 金额: $ 40.72万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2148646&HistoricalAwards=false
• 关键词: Collaborative; Research; Understanding; Acoustoplasticity; through

Materials, especially metals, can be deformed more easily when exposed to high frequency elastic waves. Such phenomenon is called acoustoplasticity and has been used in several applications, such as metal forming, extrusion, welding, flip-chip bonding, and ultrasonic additive manufacturing. Despite its widespread use, these processes are still at a “trial and error” stage due to the lack of a clear understanding of the underlying mechanisms. This award supports fundamental research to unravel the deformation processes that drive acoustoplasticity through a combined computational and experimental approach, from the atomistic up to the microstructural scale. The knowledge gained from this award can improve vibration/ultrasonic assisted manufacturing methods, especially ultrasonic additive manufacturing, which has the potential for on-demand, in-space manufacturing. This award will support cross-cutting research between mechanics, high performance computing, data science, material characterization, and testing. Student recruitment, including for summer undergraduate research opportunities, will focus on underrepresented minorities. Additionally, hands-on computational and experimental workshops will target K-12 school children and teachers.The mechanisms behind acoustoplasticity in metals are not fully understood because: (1) acoustic excitation occurs in the macroscale, but its effects can be spread over orders of magnitude in the spatio-temporal scale; (2) single-scale models smear out the mechanisms spread over multiple scales and cannot address the full complexity; and (3) probing the acoustic-affected dislocation plasticity is challenging due to the fast time scale of the events. This research will fill these knowledge gaps by combining multiscale simulations, time resolved nonlinear waves, and microscopy. The complex dynamics of plastic deformation under ultrasonic vibrations will be characterized through concurrent atomistic-continuum simulations. The in-situ, time-resolved experiments will be used to capture the microstructural evolution under ultrasonic vibrations, e.g., with the use of scanning electron microscopy and electron back scatter diffraction. Finally, a mechanism-based parameter will be calibrated to bridge the simulations and experiments across multiple spatio-temporal scales for a multiscale understanding of acoustoplasticity.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.

材料，尤其是金属，在暴露于高频弹性波时更容易变形，这种现象称为声塑性，并已用于金属成型、挤压、焊接、倒装芯片键合和超声波增材制造等多种应用中。尽管其广泛使用，但由于缺乏对潜在机制的清晰了解，这些过程仍处于“试错”阶段。该奖项支持揭示驱动变形过程的基础研究。通过计算组合和实验方法实现从原子到微观结构尺度的声塑性，从该奖项中获得的知识可以改进振动/超声波辅助制造方法，特别是超声波增材制造，它具有按需、空间内的潜力。该奖项将支持力学、高性能计算、数据科学、材料表征和测试之间的交叉研究，包括暑期本科生研究机会，此外，还将重点关注少数群体的实践计算和实践。实验研讨会将针对 K-12 学童和教师。金属声塑性背后的机制尚未完全了解，因为：(1) 声激发发生在宏观尺度，但其影响可以在时空尺度上传播多个数量级（2）单尺度模型掩盖了跨多个尺度的机制，无法解决全部复杂性；（3）由于事件的时间尺度很快，探测受声波影响的位错塑性具有挑战性。研究将通过结合多尺度模拟、时间分辨非线性波和显微镜来填补这些知识空白，将通过同时进行的原子连续模拟来表征超声振动下的复杂塑性变形动力学。捕获超声波振动下的微观结构演变，例如使用扫描电子显微镜和电子背散射衍射最后，将得到基于机制的参数。经过校准，可以在多个时空尺度上连接模拟和实验，以实现对声塑性的多尺度理解。该奖项是 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。