Debonding dynamics of pressure-sensitive adhesives: 3D block model

Area of Science:

• Materials Science
• Mechanical Engineering
• Adhesion Science

Background:

• The probe-tack test is crucial for evaluating adhesive performance.
• Understanding debonding mechanisms in viscoelastic materials is complex.
• Existing models may not fully capture the nuances of cavity expansion during debonding.

Purpose of the Study:

• To develop a comprehensive 3D mechanical model for cavity expansions.
• To describe the debonding phase in viscoelastic solids during probe-tack tests.
• To correlate model predictions with experimental data for pressure-sensitive adhesives.

Main Methods:

• Development of a 3-dimensional mechanical model.
• Simulation of cavity expansions in a viscoelastic solid medium.
• Analysis of stress-strain relationships and separation speed dependence.

Main Results:

• The model accurately replicates experimental stress-strain curves for typical pressure-sensitive adhesives.
• Cavity expansion dynamics during debonding are effectively described.
• Separation speed dependence is explained through viscous dissipation at high strain rates.

Conclusions:

• The developed 3D model provides a robust framework for understanding adhesive debonding.
• Viscous dissipation plays a key role in the observed speed dependence of the probe-tack test.
• The model offers valuable insights for designing and predicting the behavior of viscoelastic adhesives.