Collaborative Research: Identifying Hydrogen-Density Based Laws for Plasticity in Polycrystalline Materials

合作研究：确定基于氢密度的多晶材料塑性定律

• 批准号: 2303108
• 负责人: Zachary Harris
• 金额: $ 27.38万
• 依托单位: University of Pittsburgh
• 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: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303108&HistoricalAwards=false
• 关键词: Collaborative; Research; Identifying; Hydrogen; Density

Hydrogen-induced degradation of structural materials is responsible for unexpected component failures across the aerospace, marine, energy, and infrastructure sectors. Similarly, concerns over hydrogen-induced embrittlement are a primary factor hindering the broader adoption of a hydrogen-based fuel economy. Current efforts to prevent these failures are complicated by challenges with accurately predicting hydrogen-related damage and its dependence on hydrogen concentration. This study will use a combined experimental and modeling approach to address these questions, resulting in new fundamental understanding of how hydrogen affects material behavior. This research will also benefit the national welfare in clean energy efforts by enabling the prediction of hydrogen-induced damage under conditions where hydrogen-assisted fracture is of concern. Moreover, in addition to training multiple graduate students, this project will actively engage in educational outreach with middle and high school students through dedicated events, lectures, and laboratory demonstrations.The researched study will establish how hydrogen affects plastic damage accumulation and leverage developed insights to create a hydrogen-sensitive crystal plasticity framework. First, conventional (mechanical testing) and advanced (high-energy X-ray diffraction) techniques will be employed to elucidate the effect of hydrogen concentration on the deformation behavior of pure single crystal and polycrystal Ni under monotonic and cyclic loading conditions. Second, this dataset will be leveraged to derive consistent hydrogen-sensitive laws for crystallographic slip and hardening that incorporate hydrogen effects on backstress development and dynamic recovery, enabling use for a wide range of hydrogen concentrations and loading conditions. Third, these deformation laws will then be integrated into a crystal plasticity framework, which will undergo validation using both experimental mechanical testing data and spatial distributions of microstructure-scale elastic strains via electron backscatter diffraction techniques to demonstrate model efficacy. The researched study will have broad impact as the hydrogen-informed crystal plasticity framework will be critical to supporting a hydrogen-based fuel economy. Additionally, all experimental data from this effort will be made available to the research community. Middle and high school students will get exposure and insight into critical issues for hydrogen embrittlement based on interactive Virtual Labs, case studies, and hands-on laboratory investigations that illustrate hydrogen’s effect on deformation behavior and potential component failure.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.

氢引起的结构材料降解是导致航空航天、海洋、能源和基础设施领域意外部件失效的原因。同样，对氢引起的脆化的担忧是阻碍氢燃料经济性更广泛采用的主要因素。由于准确预测与氢相关的损伤及其对氢浓度的依赖性，防止这些故障的努力变得更加复杂。这项研究将使用实验和建模相结合的方法来解决这些问题，从而对氢如何影响材料行为产生新的基本认识。这项研究也将受益此外，除了培训多名研究生外，该项目还将积极参与初中和高中的教育推广活动。通过专门的活动、讲座和实验室演示，该研究将确定氢如何影响塑性损伤积累，并利用成熟的见解创建氢敏感晶体塑性框架。首先，传统（机械测试）和先进（高能-射线衍射）技术将被用来阐明单调和循环加载条件下氢浓度对纯单晶和多晶镍变形行为的影响，该数据集将用于推导晶体滑移和硬化的一致氢敏感定律，其中包含氢对背应力发展的影响。第三，这些变形定律将被整合到晶体塑性框架中，该框架将使用实验机械测试数据和空间分布进行验证。通过电子背散射衍射技术进行微观结构尺度的弹性应变以证明模型功效，该研究将产生广泛的影响，因为氢信息晶体塑性框架对于支持氢基燃料经济性至关重要。将向研究界开放，中学生和高中生将通过交互式虚拟实验室、案例研究和动手实验室研究来了解和深入了解氢脆的关键问题，这些研究说明了氢对变形行为和潜在成分的影响。该奖项反映了 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。