Nonlinear Propagation of Amplitude-Modulated Ultrasonic Wave in Composite Material

Shiro Biwa; Kazuyoshi Nagae; Claude Inserra; Eiji Matsumoto

doi:10.4028/www.scientific.net/KEM.452-453.757

Paper Titles

Investigation of Surface Crack Types under Axial Compression Loading for a Case-Hardening Steel
p.741

Effect of Humidity on Fatigue Strength of Age-Hardened Al Alloy under Rotating Bending
p.745

Giga-Cycle Fatigue Behavior of Notched Specimens for High Speed Steel
p.749

In Situ Observation of Crack Propagation in Epoxy Composite Reinforced with Crushed Silica Particles
p.753

Nonlinear Propagation of Amplitude-Modulated Ultrasonic Wave in Composite Material
p.757

Stereophotogrametric Determination of Crack Initiation and Propagation in Tooth Root
p.761

Retrofitting Effect of Unreinforced Masonry Walls Using FRPs
p.765

A Comparison of CMOD-Based CTOD and J-Conversion CTOD in Shallow Crack Specimens
p.769

Flexural Capacities of One-Way Hollow Slab with Donut Type Hollow Sphere
p.773

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Nonlinear Propagation of Amplitude-Modulated Ultrasonic Wave in Composite Material

Abstract:

Some nonlinear effects in the ultrasonic wave propagation in a unidirectional carbon/carbon (C/C) composite were examined experimentally. High-power amplitude-modulated longitudinal ultrasonic waves were sent to the C/C composite sample, and the nonlinear generation of low-frequency components was observed. Due to the heterogeneity and pre-existing damage of the composite, the carrier-wave component undergoes severe attenuation, and the low-frequency components were dominant in some situations. Such low-frequency components are found to grow in a nonlinear manner, and can be a useful source of information characterizing the nonlinearity of the material.