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NNA: Bridging the Atomistic Deformation Mechanisms to the Microscopic Adhesive-to-Cohesive Fracture at Ice-Metal Interfaces

NNA：将原子变形机制与冰-金属界面处的微观粘着-内聚断裂联系起来

基本信息

批准号：
1824840
负责人：
Hui Hu
金额：
$ 46.5万
依托单位：
Iowa State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2024-02-29
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1824840&HistoricalAwards=false
关键词：
NNA Bridging Atomistic Deformation Mechanisms

项目摘要

Ice accretion over cold surfaces is a topic of great concern for numerous engineering applications, including airplanes, wind turbines, and marine vessels sailing near polar seas. However, a strategy of de-icing (detaching ice from cold surfaces) with minimal power input is not well-established yet due to the lack of answers to many fundamental questions, such as how does the ice shed from a metallic surface and what controls the conversion of fracture type from adhesive (fracture at an ice-metal interface) to cohesive (fracture within ice itself) cracking? This research project will advance the science of interfacial mechanics by identifying the fundamental mechanisms for the adhesive-to-cohesive fracture in an ice-metal material system; correlate an ice-metal interface structure with its ice adhesion strength; and support the search of de-icing strategies that consume far less power than existing approaches. The project would also advance the national health, prosperity, and welfare by enabling a rational design of materials that either inhibit or enhance ice adhesion, with implications for a wide range of safety-critical infrastructures operating in arctic and cold weathers, including telecommunication equipment, power lines, automotive vehicles, marine vessels, and offshore oil platforms, along with the food and transport sectors in everyday environment. With these advancements, this project will support the NSF Big Idea on Navigating the New Arctic (NNA) through impact on the design and engineering of civil infrastructure for an increasing marine commerce in the Arctic. As part of project, education and outreach activities will focus on hiring undergraduate students for the summer, performing outreach to women and minority students through university-based programs, and dissemination of software from a web-portal.This project will combine multi-physics, multi-scale simulation and experimentation, i.e., coarse-grained modeling of water, novel concurrent atomistic-continuum modeling of metallic materials, and experiments in a unique Icing Research Tunnel facility, to elucidate the underlying physics pertinent to adhesive-to-cohesive interface fracture in ice-metal material systems. The computer models will be integrated to enable multiscale simulation of solid-liquid interaction from the atomistic to the microscale, while accounting for the realistic microstructure of ice-metal material specimens fabricated in the experimental facility. The research will determine the role of dislocation-mediated plasticity in an adhesive-to-cohesive interface fracture, and quantify the ice-metal adhesion strength and its sensitivity to metal surface topology, chemistry, and ice microstructure. The models will be calibrated and validated with experimental measurements at relevant scales. This project will also provide participating students a broad range of knowledge and skills in icing physics, anti-/de-icing technology, mechanics, supercomputing, material processing and characterization, and icing tunnel testing. Several kits of ice-metal material systems will be designed, fabricated and distributed in local middle and high schools for illustrating how slight changes of a metal surface can significantly change its ice adhesion strength.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.

寒冷表面的积冰是许多工程应用非常关注的话题，包括飞机、风力涡轮机和在极地海域附近航行的船舶。然而，由于缺乏许多基本问题的答案，例如冰如何从金属表面脱落以及什么控制着断裂类型从粘合剂（冰-金属界面处的断裂）到内聚性（冰本身内部的断裂）裂纹的转换，因此以最小功率输入进行除冰（从冷表面分离冰）的策略尚未完善。该研究项目将通过确定冰-金属材料系统中粘合-内聚断裂的基本机制来推进界面力学科学；将冰-金属界面结构与其冰粘附强度相关联；并支持寻找比现有方法消耗更少电力的除冰策略。该项目还将通过合理设计抑制或增强冰粘附的材料来促进国民健康、繁荣和福利，对在北极和寒冷天气下运行的各种安全关键基础设施产生影响，包括电信设备、电力线、汽车、船舶和海上石油平台，以及日常环境中的食品和运输部门。凭借这些进步，该项目将通过影响民用基础设施的设计和工程来支持国家科学基金会关于航行新北极（NNA）的大构想，以增加北极的海洋贸易。作为项目的一部分，教育和外展活动将侧重于暑期聘用本科生，通过大学项目向女性和少数民族学生进行外展，以及从门户网站传播软件。该项目将结合多物理、多尺度模拟和实验，即水的粗粒度建模、金属材料的新颖并发原子连续体建模以及独特的结冰实验。研究隧道设施，旨在阐明与冰-金属材料系统中的粘合-内聚界面断裂相关的基础物理原理。计算机模型将被集成，以实现从原子到微观尺度的固液相互作用的多尺度模拟，同时考虑到在实验设施中制造的冰金属材料样本的真实微观结构。该研究将确定位错介导的塑性在粘合-内聚界面断裂中的作用，并量化冰-金属粘合强度及其对金属表面拓扑、化学和冰微观结构的敏感性。这些模型将通过相关规模的实验测量进行校准和验证。该项目还将为参与的学生提供广泛的结冰物理、防/除冰技术、力学、超级计算、材料加工和表征以及结冰隧道测试方面的知识和技能。将在当地初中和高中设计、制造和分发几套冰-金属材料系统，以说明金属表面的微小变化如何显着改变其冰的粘附强度。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。