Journal
BIOMIMETICS
Volume 8, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/biomimetics8060477
Keywords
adhesion; simultaneous normal and tangential contact; elastomer; friction; adhesive strength; work of adhesion; experiment; simulation
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This study investigates the process of indentation and detachment of a steel indenter in a soft elastomer layer under different inclination angles. Experimental and theoretical analysis reveals the differences in characteristics between small indentation angles and angles close to the normal angle.
In reported experiments, a steel indenter was pressed into a soft elastomer layer under varying inclination angles and subsequently was detached under various inclination angles too. The processes of indentation and detachment were recorded with a video camera, and the time dependences of the normal and tangential components of the contact force and the contact area, as well as the average contact pressure and average tangential stresses, were measured as functions of the inclination angle. Based on experimental results, a simple theoretical model of the indentation process is proposed, in which tangential and normal contacts are considered independently. Both experimental and theoretical results show that at small indentation angles (when the direction of motion is close to tangential), a mode with elastomer slippage relative to the indenter is observed, which leads to complex dynamic processes-the rearrangement of the contact boundary and the propagation of elastic waves (similar to Schallamach waves). If the angle is close to the normal angle, there is no slipping in the contact plane during the entire indentation (detachment) phase.
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