Presenter Information

A. Cheng, Northwestern University

Location

La Jolla, CA

Start Date

1-1-1998 12:00 AM

Description

The modeling of the time-domain signals transmitted and/or reflected by a layered structure is very useful for the simulation of wave propagation in the structure containing deteriorated layers, defects and delaminations and for the characterization of material properties in those layers. In this paper, we first present the relations between the signals transmitted and reflected by a layered plate in terms of transmission and reflection coefficients in the frequency domain. The time domain signals transmitted and reflected by the plate are then expressed by use of the inverse Fourier transform. The simulated signals transmitted and reflected by an Aluminum plate and a Titanium plate and a diffusion bonded Titanium plate are compared with measured signals. The inverse problem for the determination of the unknown parameters of the layered plates in the time-domain is also discussed.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

17A

Chapter

Chapter 4: NDE Sensors and Fields

Section

UT Sensors, Transducers and Fields

Pages

979-985

DOI

10.1007/978-1-4615-5339-7_126

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Material Parameter Determination from Time-Domain Signals Transmitted and Reflected by a Layered Structure

La Jolla, CA

The modeling of the time-domain signals transmitted and/or reflected by a layered structure is very useful for the simulation of wave propagation in the structure containing deteriorated layers, defects and delaminations and for the characterization of material properties in those layers. In this paper, we first present the relations between the signals transmitted and reflected by a layered plate in terms of transmission and reflection coefficients in the frequency domain. The time domain signals transmitted and reflected by the plate are then expressed by use of the inverse Fourier transform. The simulated signals transmitted and reflected by an Aluminum plate and a Titanium plate and a diffusion bonded Titanium plate are compared with measured signals. The inverse problem for the determination of the unknown parameters of the layered plates in the time-domain is also discussed.