Effects of interdiffusion on shear response of semi-coherent {111} interfaces in Ni/Cu

Oct 1, 2022

Abstract: Intermixing of chemical species as a result of interdiffusion during the manufacturing of metallic nanolaminates leads to diffuse interface structures which have distinct properties compared to corresponding atomically sharp interfaces.

Coarse-grained atomistic modeling of dislocations and generalized crystal plasticity

Apr 6, 2022

Abstract: Recent developments in generalized continuum modeling methods ranging from coarse-grained atomistics to micromorphic theory offer potential to make more intimate physical contact with dislocation field problems framed at length scales on the order of microns.

Lattice dislocation induced misfit dislocation evolution in semi-coherent {111} bimetal interfaces

Jul 1, 2021

Abstract: Characterization of misfit dislocation evolution in bimetal interfaces is critical for understanding plasticity in nanolaminates as local misfit dislocation structures affect dislocation/interface interactions. This work utilizes the Concurrent Atomistic- Continuum method to probe the evolution of misfit structures at semi-coherent Ni/Cu and Cu/Ag interfaces impinged by dislocation pileups generated via nanoindentation.

Silane functionalization effects on dispersion of alumina nanoparticles in hybrid carbon fiber composites

Aug 10, 2018

Abstract: Hybrid carbon fiber reinforced polymer composites are a new breed of materials currently being explored and characterized for next-generation aerospace applications. Through the introduction of secondary reinforcements, such as alumina nanoparticles, hybrid properties including improved mechanical properties—fracture toughness, for example—and stress-sensing capabilities can be achieved.

Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments

Aug 25, 2017

Abstract: The application of high temperature ceramic coatings has enabled aircraft and power generation turbines to run at higher inlet temperatures for greater efficiency. Their use extends the lifetime of the superalloy blades that bear thermal gradients and mechanical loads during operation.

Quantifying Alumina Nanoparticle Dispersion in Hybrid Carbon Fiber Composites Using Photoluminescent Spectroscopy

Feb 1, 2017

Abstract: Composites modified with nanoparticles are of interest to many researchers due to the large surface-area-to-volume ratio of nano-scale fillers. One challenge with nanoscale materials that has received significant attention is the dispersion of nanoparticles in a matrix material.

Characterization of Hybrid Carbon Fiber Composites using Photoluminescence Spectroscopy

Jan 5, 2017

Abstract: Hybrid carbon fiber reinforced polymers (HCFRPs) are a new breed of material that are currently being explored and characterized for next generation aerospace applications. Through the introduction of secondary reinforcements, such as alumina nanoparticles, it is possible to achieve improved mechanical behavior and enable structural sensing to create unique hybrid properties.

Characterizing Mechanical Properties of Hybrid Alumina Carbon Fiber Composites with Piezospectroscopy

Jan 1, 2016

Abstract: Carbon fiber composites have become popular in aerospace structures and applications due to their light weight, high strength, and high performance. Recently, scientists have begun investigating hybrid composites that include fibers and particulate fillers, since they allow for advanced tailoring of mechanical properties, such as improved fatigue life.