Stress tunable properties of ferromagnetic microwires and their multifunctional composites J. Appl. Phys. 109, 07A310 (2011) Spherical indentation of a finite poroelastic coating Appl. Phys. Lett. 93, 031911 (2008) Analyses of the work required to delaminate a coating film from a substrate under oscillating load conditions and the film-substrate contact behavior after delamination J. Appl. Phys. 103, 103505 (2008) A method to study the crack healing process of glassformers Appl. Phys. Lett. 92, 011918 (2008) Time-resolved dynamic compaction and tensile fracture of low-porosity aluminum under impact loading J. Appl. Phys. 102, 073518 (2007) Additional information on J. Appl. Phys. The microindentation technique was used to determine the interfacial fracture energy of epoxy coatings on soda-lime glass substrates. An analytical model was developed for calculating fracture energy based on indenter load versus debond crack size measurements. Finite-element analysis was used to determine the relative amounts of opening and shear loadings at the debond crack tip. The calculated fracture energies are compared to values determined by the double-cantilever-beam technique and the four-point flexure-beam technique.
The purpose of this research was to examine problems associated with the propagation of cracks near a free surface and near the interface of a glass/epoxy bonded system. Crack propagation was induced by placing Knoop indentations in the glass at various sites adjacent to and remote from the surface or interface. These experimental studies were supplemented by finite element stress analysis. Experiments show that for an indent parallel to the surface or interface, the initial direction of crack propagation from the indent is always toward the surface or interface and then as the crack approaches the surface or interface, the crack path deviates away from the surface. Results of finite element analysis show that the initial direction of crack propagation is in the direction normal to the maximum principal stress at the crack tip.
A microindentation technique was developed to measure the adhesive shear strength of thin polymer coatings on glass substrates. 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 the substrate. Stress analyses to calculate the interfacial shear stress for the indentation-induced debonding of thin coatings are presented for the three types of debonding. All three stress analyses are based upon the linear, elastic analysis of the contact stresses arising from indentation of a soft coating on a rigid substrate. These analyses provide a basis for using controlled indentation debonding as a quantitative measure of the interfacial shear strength of thin coatings to rigid substrates.
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