Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

Much of the significant damage that may be incurred by graphite-epoxy composite materials results in relatively large discrete damage sites such as delaminations. In those instances, the damage is easily and reliably detected using conventional ultrasonic scanning techniques. However, several mechanisms also exist which do not result in the creation of large discrete damage sites, but result in damage which is distributed throughout the material. These mechanisms include the production of porosity due to poor curing procedures, damage resulting from fatigue or overheating of the composite structure in service, and water ingress caused by prolonged exposure of the material. Of these, the detection of porosity during manufacture has received the most attention, although the assessment of damage from the other sources is also important.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

14A

Chapter

Chapter 3: Interpretive Signal Processing and Image Analysis

Section

Signal Processing

Pages

703-710

DOI

10.1007/978-1-4615-1987-4_87

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Attenuation and Porosity Estimation Using the Frequency-Independent Parameter Q

Snowmass Village, CO

Much of the significant damage that may be incurred by graphite-epoxy composite materials results in relatively large discrete damage sites such as delaminations. In those instances, the damage is easily and reliably detected using conventional ultrasonic scanning techniques. However, several mechanisms also exist which do not result in the creation of large discrete damage sites, but result in damage which is distributed throughout the material. These mechanisms include the production of porosity due to poor curing procedures, damage resulting from fatigue or overheating of the composite structure in service, and water ingress caused by prolonged exposure of the material. Of these, the detection of porosity during manufacture has received the most attention, although the assessment of damage from the other sources is also important.