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Recent progress on crack pattern formation in thin films.

Mengqi Liu1, Senjiang Yu2, Linghui He1

  • 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui, 230026, China. yni@ustc.edu.cn.

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Summary
This summary is machine-generated.

This review explores crack patterns in thin films, summarizing factors influencing their formation and propagation. Understanding these patterns aids in predicting thin film reliability and controlling their fabrication.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Quasi-static crack growth in thin films is crucial for interdisciplinary science and engineering.
  • Understanding crack pattern formation is key to thin film reliability and fabrication.

Purpose of the Study:

  • To review recent experimental and theoretical advancements in thin film crack pattern formation.
  • To summarize factors influencing crack path selection and pattern evolution.
  • To discuss the interplay between crack propagation and other stress-relaxation mechanisms.

Main Methods:

  • Literature review of experimental and theoretical studies on crack patterns in thin films.
  • Analysis of key factors affecting crack path selection (loading types, substrate confinement).
  • Discussion of coupled phenomena like interface debonding and buckling instability.

Main Results:

  • Identified key factors influencing crack path selection and pattern diversity.
  • Highlighted the impact of coupled stress-relaxation processes on crack pattern evolution.
  • Provided insights into the driving forces behind crack pattern changes.

Conclusions:

  • Crack pattern formation in thin films is influenced by loading, confinement, and coupled instabilities.
  • Understanding crack evolution aids in assessing thin film reliability and failure mechanisms.
  • This knowledge can guide the controllable fabrication of desired crack patterns.