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

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Overview

Project Abstract

Time sequences of the polycrystalline ice formation from freezing a water slab confined by two cold substrates

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.

Logistics Summary

Through integrating multiscale computations with experiments, the goal of this project is (i) to identify the atomistic origin of the microscopic-level adhesive-to-cohesive fracture near an ice-metal interface; (ii) to correlate the multi-level material microstructure with the ice adhesion strength; and (iii) to explore the innovative strategies of de-icing with a minimum power requirement. This research integrates computations with experiments to fill a knowledge gap in correlating the atomistic mechanisms with the microscopic-level material interface fracture in an ice-metal system. It combines the strengths of a coarse-grained model of water (mW), a CAC model of crystalline solids, and the unique facility in an Icing Research Tunnel (IRT). Experiments in IRT mimic the real icing conditions outdoors. No fieldwork will be conducted.

Keywords

Navigating the New Arctic; NNA Track 1; icing and de-icing; ice-metal adhesion; crack propagation in ice; multiscale simulation

Members

Principal Investigator

Photo

Liming Xiong

Iowa State University

Xiong - link to SAM contact for fixing fields.

Co-Principal Investigator

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Hui Hu

Iowa State University

Hu - link to SAM contact for fixing fields.
Resources

April 2020 Lightning Talk Video for NNA Award 1824840

A Navigating the New Arctic (NNA) project update video produced for the April 2020 virtual NNA Investigators meeting. The video is narrated by Liming Xiong (Iowa State University).

Program: 
Navigating the New Arctic
Resource Type: 
video

April 2020 Project Update Report for NNA Award 1824840

A brief Navigating the New Arctic (NNA) project update report for NSF Award 1833165 produced for the April 2020 virtual NNA Investigators meeting.

Program: 
Navigating the New Arctic
Resource Type: 
report

Dates

1 September 2018 to 31 August 2021

Location

No field location

Additional URLs

Program

Award Year: 2018
Funding Track: