Location

La Jolla, CA

Start Date

1-1-1993 12:00 PM

Description

Evaluation of aging aircraft involves inspection of large areas of plates, including lap joints, bonded material and other complex geometries. These inspections need to be done within a reasonable time in order to be economical. Ultrasonic measurements of plate-modes propagating for large distances [1] are a promising method for fast detection of these defects in a commercial environment. There is a need to predict the waveforms of such waves in order to analyze the results of the experimental data. Analytic solution cannot always be found for general cases, therefore, numerical prediction of elastic wave propagation for long distances is desired. However, the large problem size and the long propagation time that is involved require careful attention to the discretization. Small mesh size discretization which is needed for accurate solutions can no longer be practical because of the memory limitations and the high computational costs. On the other hand, a large mesh size can cause severe errors especially when long propagation time is concerned. This paper describes a new method which successfully deals with this issue.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12A

Chapter

Chapter 1: Development of Standard Techniques

Section

Elastic Wave Propagation

Pages

139-146

DOI

10.1007/978-1-4615-2848-7_17

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 PM

Improved finite difference method for long distance propagation of waves

La Jolla, CA

Evaluation of aging aircraft involves inspection of large areas of plates, including lap joints, bonded material and other complex geometries. These inspections need to be done within a reasonable time in order to be economical. Ultrasonic measurements of plate-modes propagating for large distances [1] are a promising method for fast detection of these defects in a commercial environment. There is a need to predict the waveforms of such waves in order to analyze the results of the experimental data. Analytic solution cannot always be found for general cases, therefore, numerical prediction of elastic wave propagation for long distances is desired. However, the large problem size and the long propagation time that is involved require careful attention to the discretization. Small mesh size discretization which is needed for accurate solutions can no longer be practical because of the memory limitations and the high computational costs. On the other hand, a large mesh size can cause severe errors especially when long propagation time is concerned. This paper describes a new method which successfully deals with this issue.