Collaborative Research: Spatial and Dynamic Heterogeneity and Nonlinear Viscoelastic Constitutive Behavior of Glasses and Their Nanocomposites as Probed by Nonlinear Spectroscopies

合作研究：非线性光谱探测玻璃及其纳米复合材料的空间和动态异质性以及非线性粘弹性本构行为

• 批准号: 2219347
• 负责人: Hongbing Lu
• 金额: $ 26.17万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-11-01 至 2025-10-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2219347&HistoricalAwards=false
• 关键词: Collaborative; Research; Spatial; Dynamic; Heterogeneity

This research project will answer fundamental questions related to the performance of glassy polymers and their nanocomposites. These materials are important for a wide range of defense and commercial applications. Two mechanical spectroscopy techniques will be used to identify the unique “fingerprint” of these materials. Although normally used for soft materials, this research will employ this approach to investigate the nonlinear response of glassy polymers and their nanocomposites. The study combines experiment and computation to advance the science and engineering fundamentals of these advanced materials. The outreach programs at both universities provide opportunities for K-12 students and teachers to advance in their understanding and familiarity with STEM through activities exploring engineering, materials, and recycling. Students from underrepresented groups will be recruited to all activities of the work. The impact will be broadened by publication of results as well as technical presentation of the work at major conferences and incorporation of the findings in courses.The specific goals of the research are to use nanoparticle reinforced polymer glasses to elucidate the impact of different length scales and heterogeneity on the nonlinear viscoelasticity of polymer glasses and, simultaneously, their nanocomposites. The richness of the study arises from the facts that, in glass-forming systems including polymers, there is a consensus that the heterogeneities are on the scale of a few nanometers whereas in nanocomposites the size-scale range of interest can vary from that of the heterogeneity-scale of the polymer to the size of multiple particles, i.e., above 100 nm. There is significant evidence that properties of the polymer matrix itself are modified by the interphases and confinement effects, thus leading to a rich range of heterogeneity in these materials. The work uses the mechanical spectral hole burning (MSHB) and large amplitude oscillatory shear (LAOS) fingerprinting framework to elucidate the impact of different scales and heterogeneity on the nonlinear viscoelasticity of polymer glasses and their nanocomposites, something that has heretofore not been investigated. The intent is to systematically vary the scale and nature of the heterogeneity, to fingerprint it experimentally, and compare the results with computational models of behavior. The outcome will be a greatly improved understanding of how heterogeneity in glassy polymers and their nanocomposites impacts nonlinear behavior and, consequently, performance.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.

该研究项目将回答与玻璃状聚合物及其纳米复合材料的性能相关的基本问题，这些材料对于广泛的国防和商业应用非常重要，将使用两种机械光谱技术来识别这些材料的独特“指纹”。虽然通常用于软材料，但这项研究将采用这种方法来研究玻璃聚合物及其纳米复合材料的非线性响应。该研究结合了实验和计算，以推进这些先进材料的科学和工程基础。通过探索工程、材料和回收的活动，K-12 学生和教师将有机会增进对 STEM 的理解和熟悉。研究结果的公布将扩大影响力。以及在主要会议上的工作技术演示以及将研究结果纳入课程中。该研究的具体目标是使用纳米粒子增强聚合物玻璃来阐明不同长度尺度和异质性对非线性粘弹性的影响聚合物玻璃及其纳米复合材料的丰富性源于以下事实：在包括聚合物的玻璃形成系统中，人们一致认为，异质性在几纳米范围内，而在纳米复合材料中，异质性在尺寸上。感兴趣的尺度范围可以从聚合物的异质性尺度到多个颗粒的尺寸，即大于 100 nm，有显着的证据表明聚合物基质本身的性质被改变。该工作使用机械谱烧孔（MSHB）和大幅度振荡剪切（LAOS）指纹框架来阐明不同尺度和异质性对非线性的影响。聚合物玻璃及其纳米复合材料的粘弹性，迄今为止尚未得到研究，其目的是系统地改变异质性的规模和性质，对其进行指纹识别。实验，并将结果与​​行为计算模型进行比较，结果将大大提高对玻璃聚合物及其纳米复合材料的异质性如何影响非线性行为以及性能的理解。该奖项反映了 NSF 的法定使命，并被认为是值得的。通过使用基金会的智力优势和更广泛的影响审查标准进行评估来提供支持。

项目成果

Temporally continuous thermofluidic–thermomechanical modeling framework for metal additive manufacturing

用于金属增材制造的时间连续热流-热机械建模框架

• DOI: 10.1016/j.ijmecsci.2023.108424
• 发表时间: 2023-09
• 期刊: International Journal of Mechanical Sciences
• 影响因子: 7.3
• 作者: Mathews, Ritin;Nagaraja, Kishore Mysore;Zhang, Runyu;Sunny, Sumair;Yu, Haoliang;Marais, Deon;Venter, Andrew;Li, Wei;Lu, Hongbing;Malik, Arif
• 通讯作者: Malik, Arif

Integrating robotic wire arc additive manufacturing and machining: hybrid WAAM machining

集成机器人线弧增材制造和加工：混合 WAAM 加工

• DOI: 10.1007/s00170-023-12517-4
• 发表时间: 2023-10-24
• 期刊: The International Journal of Advanced Manufacturing Technology
• 作者: B. Li;Kishore M. Nagaraja;Runyu Zhang;Arif Malik;Hongbing Lu;Wei Li
• 通讯作者: Wei Li

Viscoelastic Characterization of Poly(3-hexylthiophene): Determination of Young’s Modulus

聚 (3-己基噻吩) 的粘弹性表征：杨氏模量的测定

• DOI: 10.1021/acsapm.3c00939
• 发表时间: 2023-07-11
• 期刊: ACS Applied Polymer Materials
• 影响因子: 5
• 作者: Branston E. Mefferd;V. V. Nambiar;Hongbing Lu;M. Stefan
• 通讯作者: M. Stefan

Processing aluminum alloy with hybrid wire arc additive manufacturing and ultrasonic nanocrystalline surface modification to improve porosity, surface finish, and hardness

采用混合丝电弧增材制造和超声波纳米晶表面改性加工铝合金，以提高孔隙率、表面光洁度和硬度

• DOI: 10.1016/j.jmapro.2023.08.047
• 发表时间: 2023-10-01
• 期刊: Journal of Manufacturing Processes
• 影响因子: 6.2
• 作者: Wei Li;A. Amanov;K. Nagaraja;B. Li;B. Ravich;er;er;Runyu Zhang;Hongbing Lu;Dong Qian;Golden Kumar;Y. Pyun
• 通讯作者: Y. Pyun