Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

The use of ultrasonic techniques to measure the material anisotropy of rolled metal sheets has been demonstrated in many studies. Electromagnetic acoustic transducer (EMAT) and laser ultrasonic (LU) methods have been favored since both are noncontact in nature and therefore potential candidates forin-situ process monitoring and control in rolling mills. Both techniques have the ability of generating various ultrasonic wave types. EMAT systems are usually based on the excitation of Lamb or SH (horizontally polarized shear) waves and are typically designed to generate narrow band waves with known wave types. LU, on the other hand, is characterized by the simultaneous generation of multiple wave types and modes, the specifics of which are dependent upon the properties of the generation laser pulse(s) (duration, temporal and spatial shape, power) and the boundary conditions of the specimen. In general wave propagation velocities are measured and then used to calculate the texture coefficients W400, W420 and W440 [1, 2].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

15B

Chapter

Chapter 6: Material Properties

Section

Residual Stress and Texture

Pages

1693-1699

DOI

10.1007/978-1-4613-0383-1_221

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Effect of Wave Types on Ultrasonic Texture Identification

Seattle, WA

The use of ultrasonic techniques to measure the material anisotropy of rolled metal sheets has been demonstrated in many studies. Electromagnetic acoustic transducer (EMAT) and laser ultrasonic (LU) methods have been favored since both are noncontact in nature and therefore potential candidates forin-situ process monitoring and control in rolling mills. Both techniques have the ability of generating various ultrasonic wave types. EMAT systems are usually based on the excitation of Lamb or SH (horizontally polarized shear) waves and are typically designed to generate narrow band waves with known wave types. LU, on the other hand, is characterized by the simultaneous generation of multiple wave types and modes, the specifics of which are dependent upon the properties of the generation laser pulse(s) (duration, temporal and spatial shape, power) and the boundary conditions of the specimen. In general wave propagation velocities are measured and then used to calculate the texture coefficients W400, W420 and W440 [1, 2].