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Localization in an idealized heterogeneous elastic sheet
Bekele J Gurmessa1, Andrew B Croll1
1Department of Physics, North Dakota State University, Fargo, ND, USA. andrew.croll@ndsu.edu.
Soft Matter
|January 19, 2017
Summary
Heterogeneity in materials significantly impacts localized deformation. This study shows patterned elastic sheets exhibit distinct localized deformation compared to bulk regions, with outcomes tunable by pattern characteristics.
Area of Science:
- Materials Science
- Solid Mechanics
- Surface Science
Background:
- Localized deformation is critical in material failure, often studied using continuum models.
- Real materials are heterogeneous, but the effect of this heterogeneity on deformation is not fully understood.
Purpose of the Study:
- To investigate how surface heterogeneity influences localized deformation in elastic materials.
- To explore the relationship between pattern characteristics and material response under compression.
Main Methods:
- Fabrication of heterogeneous polydimethylsiloxane (PDMS) sheets using selective ultraviolet/ozone (UV/O3) treatment with a TEM grid.
- Tuning sample properties from continuous films to isolated plates by controlling UV/O3 exposure time.
- Uniaxial compression testing to observe deformation patterns.
Main Results:
- Patterned regions showed distinct localized deformation, while bulk regions exhibited uniform wrinkling.
- Local and global strains were found to depend on pattern pitch, UV/O3 exposure levels, and treatment protocol.
- Observed deformation behaviors could be modeled using existing theories by considering boundary distances and local strain.
Conclusions:
- Surface patterning is an effective method to control localized deformation in elastic materials.
- The study demonstrates that heterogeneity significantly alters material response to mechanical stress.
- Theoretical models can capture complex heterogeneous material behavior with simplified parameters.
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