Ultrasonic Nondestructive Evaluation of Damage in Continuous Fiber Composites
Abstract
A new technique for measuring the wavespeed and attenuation in the thickness direction, in extremely thin laminates, and the excitation and detection of Lamb waves in the lengthwise direction has been developed. Thus both in-plane and out-of-plane and out-of-plane measurements can be made. Damage in the form of transverse cracking in cross-ply graphite/epoxy laminates has been studied by the use of these two techniques. For through-the-thickness measurements the stiffness was found to be insensitive to transverse cracking. The attenuation, however, was found to be quite sensitive and, therefore, has been shown to be a reliable damage metric. For the complementary case of Lamb wave propagation in the lengthwise direction, both the stiffness and the attenuation were observed to be sensitive damage parameters. Velocity, Composites, Ultrasonic, Attenuation, Damage, Nondestructive evaluation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1989
- Accession Number
- ADA208840
Entities
People
- Vikram K. Kinra
Organizations
- Texas A&M University