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Use of microindentation techniques for studying the adhesion of polymer coatings
Abstract
A microindentation technique was developed to measure the interfacial shear strength and fracture energy of thin polymer coatings on glass substrates. The indentation-induced debonding behavior of 4 commercial polymer coatings on glass substrates was studied. Indentation-induced debonding of the coating was observed to occur under three different conditions: Type I was with the deformations underneath the indenter being essentially elastic, Type II was with the deformations underneath the indenter being plastic, and Type III was after the indenter penetrated into the substrate. Stress analyses to calculate the interfacial shear stress for the indentation-induced debonding of thin compliant coatings are presented for the three types of debonding. An energy balance approach was used to develop a model for calculating interfacial fracture energy from indenter load vs. debond crack size data. This model is only applicable to systems where well defined debond cracks are formed. Comparison of the interfacial fracture energy of epoxy coatings measured by indentation to that measured by double cantilever beam and four point flexure tests indicated that the interfacial fracture energy of polymer coatings is quite sensitive to the relative amounts of tensile and shear loadings at the crack tip.
Subject Area
Mechanical engineering
Recommended Citation
Rosenfeld, Leonard Geller, "Use of microindentation techniques for studying the adhesion of polymer coatings" (1990). Doctoral Dissertations Available from Proquest. AAI9100533.
https://scholarworks.umass.edu/dissertations/AAI9100533