Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Owing to the advantage of very large strength-to-weight and stiffness-to-weight ratios, composite materials are attractive for a wide range of applications. Increasingly, more and more high performance engineering structures are being built with critical structural components made from composite materials. Especially, carbon/carbon (C/C) composites are one of the few materials that are suitable for structural applications at high temperature environments. One such application is an aircraft brake disk. As compared to steel brakes, carbon/carbon brakes are lighter by about 40% and last twice as long in terms of the number of landings per overhaul [1]. Aircraft brake manufactures are therefore making brake disks and rotors out of carbon/carbon composites [2,3]. Aircraft brakes are critical components that serve multiple functions: they are the friction member, the heat sink elements, and the structural elements. To ensure product quality and structural integrity, nondestructive evaluation (NDE) methods [4,5] are needed for inspecting carbon/carbon brake disks and rotors. Ultrasonic testing is capable of revealing material inhomogeneity and internal defects. More importantly, the velocity of ultrasonic waves is related to the elastic stiffness of the material in a direct relationship.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18B

Chapter

Chapter 8: Process Control, Reliability, and Training

Section

Process Control

Pages

2235-2243

DOI

10.1007/978-1-4615-4791-4_286

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A Study on the Nondestructive Evaluation of Carbon/Carbon Brake Disks Using Ultrasonics

Snowbird, UT, USA

Owing to the advantage of very large strength-to-weight and stiffness-to-weight ratios, composite materials are attractive for a wide range of applications. Increasingly, more and more high performance engineering structures are being built with critical structural components made from composite materials. Especially, carbon/carbon (C/C) composites are one of the few materials that are suitable for structural applications at high temperature environments. One such application is an aircraft brake disk. As compared to steel brakes, carbon/carbon brakes are lighter by about 40% and last twice as long in terms of the number of landings per overhaul [1]. Aircraft brake manufactures are therefore making brake disks and rotors out of carbon/carbon composites [2,3]. Aircraft brakes are critical components that serve multiple functions: they are the friction member, the heat sink elements, and the structural elements. To ensure product quality and structural integrity, nondestructive evaluation (NDE) methods [4,5] are needed for inspecting carbon/carbon brake disks and rotors. Ultrasonic testing is capable of revealing material inhomogeneity and internal defects. More importantly, the velocity of ultrasonic waves is related to the elastic stiffness of the material in a direct relationship.