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Indentation of a square elastomeric thin film by a flat-ended cylindrical punch in the presence of long-range intersurface forces
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Image of FIG. 1.
FIG. 1.

The schematic view of the instrumentation system for measuring the force-displacement curve and side-view images of the membrane indented by a finely polished graphite flat-ended cylindrical indenter. (A) Square microfabricated membrane ( in thickness); (B) indenter ( in diameter); (C) dc motor; (D) PZT actuator; (E) force transducer; (F) precision translation stage; (G) laminar flow isolator; (H) long focal distance objective lens; (I) CCD camera; (J) image analysis system.

Image of FIG. 2.
FIG. 2.

A schematic diagram of an agglutinated square membrane indented by a cylindrical indenter: (a) the indenter approaches the surface of the membrane; (b) the membrane “jumps into contact” with the indenter when the intersurface separation reaches ; (c) further indenter displacement leads to recovery of membrane’s original shape with zero deformation; (d) indenter causes membrane deformation; (e) a negative indenter displacement leads to “pull-off.”

Image of FIG. 3.
FIG. 3.

Typical loading∕unloading curves for the adhesive contact deformation of three different sizes films, (I) , (II) , and (III) , respectively, are plotted based on three different scales of axis (, , and ). Starting , “jump-into-contact” , loading , unloading , pull-off . The magnifications of the curves in jump-into-contact region are shown and the detailed force and displacement right before the jump are also reported. The jump distances and the correspondingly generated tension force are also shown as the data in the brackets.

Image of FIG. 4.
FIG. 4.

The side-view image of a , thickness isotropic film pull-off from the cylinderlike tip, diameter , which captured through image acquisition system with a magnification of 100 times.

Image of FIG. 5.
FIG. 5.

The schematic diagram of a clamped square plate under a central load.


Generic image for table
Table I.

The experimental and calculated parameter of square membrane with various dimensions.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Indentation of a square elastomeric thin film by a flat-ended cylindrical punch in the presence of long-range intersurface forces