Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

It is of primary importance to estimate the crack size on the interface of two solids for evaluating the integrity of jointed interfaces. In this paper, the scattering problem of elastic waves is formulated for the interface crack of layered materials in water. Green’s function for the water/solid/solid material is constructed and utilized to represent the scattered pressure field in water caused by the crack opening displacement in the interface of two solids. Introduction of the far-field approximation for the scattered pressure field and then the high frequency approximation for the crack opening displacement leads to a simple equation which is related to the crack size, the wave velocity in water, the angles of incident wave and observation point, and the period of scattering amplitude in the frequency range. The size of interface crack is estimated by measuring the periodicity of the scattering amplitude for fixed transducer’s angles in water. Examples are shown for pulse-echo configurations.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

14A

Chapter

Chapter 1: Standard Techniques

Section

Elastic Wave Scattering

Pages

155-162

DOI

10.1007/978-1-4615-1987-4_16

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Size Estimation of Interface Crack by Interference Effect

Snowmass Village, CO

It is of primary importance to estimate the crack size on the interface of two solids for evaluating the integrity of jointed interfaces. In this paper, the scattering problem of elastic waves is formulated for the interface crack of layered materials in water. Green’s function for the water/solid/solid material is constructed and utilized to represent the scattered pressure field in water caused by the crack opening displacement in the interface of two solids. Introduction of the far-field approximation for the scattered pressure field and then the high frequency approximation for the crack opening displacement leads to a simple equation which is related to the crack size, the wave velocity in water, the angles of incident wave and observation point, and the period of scattering amplitude in the frequency range. The size of interface crack is estimated by measuring the periodicity of the scattering amplitude for fixed transducer’s angles in water. Examples are shown for pulse-echo configurations.