Publications

Mar, 2011

Journal

A model for the formation of fatigue striations and its relationship with small fatigue crack growth in an aluminum alloy

The fatigue crack growth process involves damage accumulation and crack extension. The two sub-processes that lead to fatigue crack extension were quantified separately in a recent model for small fatigue crack growth applicable to engineering alloys. Here, we report the results of an experimental investigation to assess the assumptions of that model. The fatigue striation…

Mar, 2011

Journal

Anisotropic elastic properties of thermal spray coatings determined via resonant ultrasound spectroscopy

The determination of elastic properties of plasma-sprayed ceramic and metallic coatings is difficult due to their complex microstructure, which involves a myriad array of pores, interfaces and other defects. Furthermore, the splat-based build-up of the coating results in transverse anisotropy in the elastic properties. In this paper, we report on the anisotropic elastic pr…

Mar, 2011

Journal

Compliant alkali silicate sealing glass for solid oxide fuel cell applications: thermal cycle stability and chemical compatibility

Mar, 2011

Conference Paper

Performance of aluminide coatings applied on alloy CF8C plus at 800°C

The cost effective, austenitic stainless steel CF8C plus is an attractive alloy for massive cast structures such as steam turbine casings. The microstructure stability and creep strength of this alloy are better than commercial high-performance heat-resistant steels such as NF709 and Super 304H, and are comparable to the Ni-based superalloy Inconel 617. The oxidation resis…

Dec, 2010

ORNL Report

Cast CF8C-Plus Stainless Steel for Turbocharger Applications

Jun, 2009

Conference Paper

High Temperature Elastic Constants of Langatate from RUS Measurements up to 1100?C

Jun, 2009

Conference Paper

The effect of porosity on the mechanical properties of cordierite diesel particulate filter substrates

Diesel particulate filter (DPF) technology depends on porous ceramic structures that trap the particulate matter in the diesel engine exhaust gas stream. The design of DPFs requires balancing the functional requirement of soot filtration with the mechanical properties and both are influenced by the porosity of the substrate. In addition, increasing the porosity of the subs…

Jun, 2009

Conference Paper

Determination of Elastic Properties and Characterization of Thermal Barrier Coatings using Resonant Ultrasound Spectroscopy

Mechanical properties of plasma sprayed ceramic coatings are extremely important to engine design. However, the determination of these properties is often difficult because of the unique and complicated microstructure of the coatings. In this presentation the determination of the elastic constants of plasma sprayed Yttria stabilized Zirconia thermal barrier coatings using…

Oct, 2008

Journal

Engineered nanostructures for multifunctional single-walled carbon nanotube reinforced silicon nitride nanocomposites

Aug, 2008

Journal

Mechanical characterization of diesel particulate filter (DPF) substrates

Nov, 2007

Journal

Small fatigue crack growth in metallic materials: A model and its application to engineering alloys