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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Amplification factor in shear-activated adhesives: effect of elasticity
Jae-Kang Kim1,2, Michael Varenberg1
1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. varenberg@gatech.edu.
Soft Matter
|September 24, 2021
Summary
Directional adhesives enable dynamic attachment and detachment. Increasing the material
Area of Science:
- Materials Science
- Adhesion Science
- Surface Engineering
Background:
- Common adhesives are for permanent joining.
- Directional adhesives offer controlled attachment and detachment.
- Performance evaluation requires assessing both activated and disactivated modes.
Purpose of the Study:
- Investigate the effect of Young's modulus on directional adhesive properties.
- Analyze attachment and detachment forces and the shear-driven amplification factor.
- Determine optimal elasticity for flap-shaped polyurethane contact elements.
Main Methods:
- Combined numerical and experimental approach.
- Fabrication of flap-shaped contact elements from polyurethane.
- Measurement of activated and disactivated pull-off forces.
- Calculation of the shear-driven amplification factor.
Main Results:
- Increasing Young's modulus decreased activated and disactivated pull-off forces.
- Increasing Young's modulus increased the shear-driven amplification factor.
- A trade-off exists between peak adhesive strength and amplification factor.
Conclusions:
- Young's modulus significantly influences directional adhesive performance.
- Material elasticity must be carefully selected for optimal attachment and detachment.
- Optimizing directional adhesives requires balancing pull-off force and amplification factor.
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