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Applying Permanent, Robust Stenciled Patterns of Fine Particles to Elastomeric Surfaces.
Paul M Mitalski1, Jacob C McGough2, Chelsea S Davis3
1School of Materials Engineering, Purdue University.
Journal of Visualized Experiments : Jove
|July 28, 2025
Summary
Researchers developed a novel spray-casting method to apply durable surface patterns on elastomeric materials. This technique enables accurate deformation tracking for advanced material modeling in soft robotics and impact mitigation applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Polymer Science
Background:
- Developing accurate models for nonlinear, large deformation elastomeric composites is crucial for applications like soft robotics, prosthetics, and impact mitigation.
- Existing optical tracking methods (e.g., digital image correlation) require surface patterns, which are difficult to apply durably to low-surface-energy elastomers.
- Large deformations can cause conventional surface patterns to distort, crack, or detach, hindering experimental analysis.
Purpose of the Study:
- To develop a robust and facile method for applying permanent, high-fidelity surface patterns to elastomeric materials.
- To enable accurate experimental capture of surface deformation fields for developing constitutive relationships.
- To facilitate the creation of reliable nonlinear, large deformation models for elastomeric composites.
Main Methods:
- A novel spray-casting technique was developed to apply powder patterns onto the inner surfaces of molds.
- Patterns were applied prior to the reactive injection molding of elastomeric parts, integrating them during the manufacturing process.
- The method allows for various patterns, from random speckles for digital image correlation to detailed multicolor designs.
Main Results:
- The spray-casting method successfully created permanent, high-fidelity surface patterns on silicone and elastomeric specimens.
- The applied patterns demonstrated robustness, withstanding large strain cyclic loadings without fading or cracking.
- The technique allows for facile marking of elastomers, suitable for both laboratory and industrial settings.
Conclusions:
- The developed spray-casting method provides a significant advancement for surface deformation analysis of elastomers.
- This technique overcomes the limitations of traditional pattern application methods for low-surface-energy materials.
- The ability to create durable, high-fidelity patterns will improve the accuracy of material behavior models and simulations for demanding applications.
