Interfacial Contact and Bonding in Autohesion V—Bonding of “Flat” Surfaces

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Abstract
All surfaces, when viewed under the microscope, are found to be rough. When the so-called “flat” surfaces are bonded together, the initial contact is only at the high points in the surface. This contact increases with time and the rate of contact establishment is a function of surface roughness and the viscoelastic properties of the material. A surface study of the “flat” compression-molded surface is made. The profiles are generated by tracing the surface with a stylus. The Interference Microscope is used to study the region in the vicinity of an asperity. The surfaces are approximated to be composed of simple spherical segments. The deformation is conceived of as a two-stage process. The first stage of easy deformation controls the initial bond strength. The initial bond strength predicted by theory agrees well with experiment.

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