Thermal cycling response of quasi-isotropic metal matrix composites

Article Abstract:

An experiment was performed to determine the thermal cycling response of a quasi-isotropic 8-ply, (0/+ or - 45/90)(sub s) Ti-based composite using perfectly bonded and debonded fiber matrix interfaces with 40% and 70% fiber volume material. Results show that thermal cycling causes debonding and delamination in 45 and 90 deg plies. Elastic and linear finite element analyses were used to determine the various stresses in the fiber matrix interface caused by changes in temperature.

Testing, Thermal stresses, Matrix mechanics

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Damage accumulation mechanisms in thermal barrier coatings

Article Abstract:

An experiment was conducted to examine the nature of oxidation/damage evolution of a partially stabilized thermal barrier coating which leads to spallation. Electron beam was utilized to investigate the progressive damage evolution of the coating. Results showed that the damage on the coating can be attributed to oxidation and microcrack evolution which can be seen in the thermal barrier coating and its substrate which eventually leads to spallation.

Coatings, Thermal properties, Zirconium oxide, Electron beams, Spallation (Nuclear physics)

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Inelastic response of off-axis MMC lamina

Article Abstract:

An experiment was conducted to determine the damage evolution and failure characteristics of a unidirectional metal matrix composite material which is used in various structural applications. The metallic composite was subjected to monotonic loading. Results revealed that the damage evolution and failure of the material can be attributed to its inelastic response and plasticity induced deformation.

Deformations (Mechanics), Deformation, Metallic composites, Scanning electron microscopes

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