Microstructural features resulting from isothermal and thermocyclic exposure of a thermal barrier coating

Article Abstract:

Research demonstrates the microstructural changes in the thermal barrier coating as influenced by isothermal and thermocyclic exposures. Long exposures to 1100 C create pores between thermally grown oxide layer and the bond coat and cracks within the former. Thermocyclic exposures led to wavy contoured thermally grown oxide layer.

Testing, Materials, Oxides, Gas-turbines, Gas turbines, Thermal properties, Aluminum coatings

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Numerical simulation of a heat-treated ring gear blank

Article Abstract:

Results show that the surface carbon profile at the end of carburization cycle from the simulation experiments agree with those from the production parts. Data also indicate that the transformation of austenite to diffusive phases and martensite are quantitatively identical.

Models, Machinery, Simulation methods, Simulation

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Numerical study of damage growth in particulate composites

Article Abstract:

Results demonstrate that onset of crack propagation in thick and thin particulate composite specimens occurs at the crack tip element with the same applied strain. Data further indicate that damage initiation, growth and saturation manifest near the crack tip.

Statistical Data Included, Composite materials, Strains and stresses, Stresses (Materials), Dynamics of a particle, Particle dynamics, Matrix mechanics

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