Format

Send to

Choose Destination
Proc Natl Acad Sci U S A. 2019 Jul 30;116(31):15368-15377. doi: 10.1073/pnas.1907732116. Epub 2019 Jul 17.

Harnessing the interface mechanics of hard films and soft substrates for 3D assembly by controlled buckling.

Liu Y1,2, Wang X3, Xu Y4, Xue Z1,2, Zhang Y5, Ning X6, Cheng X1,2, Xue Y7,8, Lu D9, Zhang Q4, Zhang F1,2, Liu J1,2, Guo X1,2, Hwang KC1, Huang Y10,7,8,9, Rogers JA10,7,8,9,11,12,13,14, Zhang Y15,2.

Author information

1
Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, P.R. China.
2
Center for Flexible Electronics Technology, Tsinghua University, 100084 Beijing, P.R. China.
3
Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211.
4
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60201.
5
Department of Biomedical, Biological, and Chemical Engineering, University of Missouri, Columbia, MO 65211.
6
Department of Aerospace Engineering, Pennsylvania State University, State College, PA 16803.
7
Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208.
8
Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208.
9
Center for Bio-Integrated Electronics, Northwestern University, Evanston, IL 60208.
10
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60201; y-huang@northwestern.edu jrogers@northwestern.edu yihuizhang@tsinghua.edu.cn.
11
Department of Chemistry, Northwestern University, Evanston, IL 60208.
12
Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208.
13
Department of Neurological Surgery, Northwestern University, Evanston, IL 60208.
14
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208.
15
Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, P.R. China; y-huang@northwestern.edu jrogers@northwestern.edu yihuizhang@tsinghua.edu.cn.

Abstract

Techniques for forming sophisticated, 3D mesostructures in advanced, functional materials are of rapidly growing interest, owing to their potential uses across a broad range of fundamental and applied areas of application. Recently developed approaches to 3D assembly that rely on controlled buckling mechanics serve as versatile routes to 3D mesostructures in a diverse range of high-quality materials and length scales of relevance for 3D microsystems with unusual function and/or enhanced performance. Nonlinear buckling and delamination behaviors in materials that combine both weak and strong interfaces are foundational to the assembly process, but they can be difficult to control, especially for complex geometries. This paper presents theoretical and experimental studies of the fundamental aspects of adhesion and delamination in this context. By quantifying the effects of various essential parameters on these processes, we establish general design diagrams for different material systems, taking into account 4 dominant delamination states (wrinkling, partial delamination of the weak interface, full delamination of the weak interface, and partial delamination of the strong interface). These diagrams provide guidelines for the selection of engineering parameters that avoid interface-related failure, as demonstrated by a series of examples in 3D helical mesostructures and mesostructures that are reconfigurable based on the control of loading-path trajectories. Three-dimensional micromechanical resonators with frequencies that can be selected between 2 distinct values serve as demonstrative examples.

KEYWORDS:

3-dimensional assembly; buckling; interface mechanics; reconfigurable 3D structures

PMID:
31315983
PMCID:
PMC6681730
[Available on 2020-01-17]
DOI:
10.1073/pnas.1907732116

Conflict of interest statement

The authors declare no conflict of interest.

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center