Effect of interfacial slippage in peel test: theoretical model

Area of Science:

• Materials Science
• Adhesion Science
• Fracture Mechanics

Background:

• Peel testing is a standard method for evaluating adhesives and tapes.
• Experimental data indicates a link between measured adhesive strength and shear-induced interfacial slippage during delamination.
• The Poisson contraction effect of adhesives influences this slippage.

Purpose of the Study:

• To develop a theoretical model analyzing the impact of shear-induced interfacial slippage in peel tests.
• To investigate how interfacial slippage affects the fracture energy within the cohesive zone.
• To identify key parameters influencing adhesion and peeling behavior.

Main Methods:

• Development of a theoretical model based on experimental observations of peel tests.
• Analysis of interfacial slippage, defined as shear displacement in the cohesive zone.
• Application of an implicit expansion method coupled with a Gauss-Chebyshev quadrature scheme for solution derivation.

Main Results:

• The study quantifies the influence of interfacial slippage on the fracture energy of the decohesive zone.
• Identified the length of the slippage zone as a critical factor affecting fracture energy.
• Determined the receding contact angle of adhesives to be another major contributor to total fracture energy.

Conclusions:

• Interfacial slippage is a significant mechanism governing the adhesion and peeling characteristics of materials.
• The theoretical model provides insights into the complex relationship between slippage, contact angle, and adhesive performance.
• Findings enhance the understanding and prediction of adhesive behavior in peel tests.