A simple microscopic model for the dynamics of adhesive failure

Area of Science:

• Materials Science
• Polymer Physics
• Adhesion Science

Background:

• Understanding adhesive failure is crucial for material design.
• Dynamic loading conditions can significantly alter material failure mechanisms.
• Existing models may not fully capture the complexities of soft adhesive failure.

Purpose of the Study:

• To develop a microscopic model for soft adhesive failure under dynamic tensile loading.
• To investigate the influence of finite polymer chain or bond length on adhesive failure.
• To characterize conditions leading to bimodal stress-strain behavior in adhesives.

Main Methods:

• Development of a microscopic model for bond rupture under dynamic loading.
• Analysis of adhesive failure under constant velocity loading.
• Comparison of model predictions with experimental data for unconfined adhesives.

Main Results:

• Demonstration that bimodal stress-strain curves can arise from finite polymer chain/bond length.
• Identification of specific loading conditions that promote bimodal failure behavior.
• Qualitative agreement between model results and experimental observations.

Conclusions:

• Finite polymer chain length is a key factor in observing bimodal stress-strain behavior in soft adhesives.
• The developed model provides insights into failure mechanisms under dynamic loading.
• The findings are relevant for adhesives failing without cavitation.