Material Characterization of Layered Structures with Ultrasound

Material Characterization of Structures Using Genetic Algorithm Vibetarional Data

Modeling and in situ identification of material parameters for layered structures based on carbon nanotube arrays

We test and model the mechanical response of a multilayer composite structure composed of alternating layers of aligned carbon nanotubes and copper foils under compression. We employ a bistable massspring model to capture the three-phase hysteretic response of the loading curve with excellent agreement with the experimental observations. An in situ identification procedure is proposed to quanti...

Research on the Transmission Characteristics of Air-Coupled Ultrasound in Double-Layered Bonded Structures

The ultrasonic transmission spectrum in a double-layered bonded structure is related closely to its interfacial stiffness. Consequently, researching the regularity of the transmission spectrum is of significant interest in evaluating the integrity of the bonded structure. Based on the spring model and the potential function theory, a theoretical model is developed by the transfer matrix method ...

Lagrangian Coherent Structures with Guaranteed Material Separation

Given an unsteady flow field, one common way to compute Lagrangian Coherent Structures (LCS) is to extract extremal structures of the Finite Time Lyapunov Exponent (FTLE). Experience has shown that the resulting structures are often close to material structures (i.e., material lines or material surfaces). Moreover, it has been proven that for an integration time converging to infinity, they con...

Absorption in periodic layered structures

Photonic band structure of metal-dielectric and semiconductor-dielectric layered structures are studied in the presence of a strong absorption. It is shown that absorption can enlarge some gaps by as much as 50%. # 2001 Elsevier Science B.V. All rights reserved.