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ASTM C 1332 Document Information:
Title
Standard Test Method for Measurement of Ultrasonic Attenuation Coefficients of Advanced Ceramics by Pulse-Echo Contact Technique
ASTM International
Publication Date:
May 10, 2001
Scope:
This test method describes a procedure for measurement of
ultrasonic attenuation coefficients for advanced structural ceramic
materials. The procedure is based on a broadband buffered
piezoelectric probe used in the pulse-echo contact mode and
emitting either longitudinal or shear waves. The primary objective
of this test method is materials characterization.
The procedure requires coupling an ultrasonic probe to the
surface of a plate-like sample and the recovery of successive front
surface and back surface echoes. Power spectra of the echoes are
used to calculate the attenuation spectrum (attenuation coefficient
as a function of ultrasonic frequency) for the sample material. The
transducer bandwidth and spectral response are selected to cover a
range of frequencies and corresponding wavelengths that interact
with microstructural features of interest in solid test
samples.
The purpose of this test method is to establish fundamental
procedures for measurement of ultrasonic attenuation coefficients.
These measurements should distinguish and quantify microstructural
differences among solid samples and therefore help establish a
reference database for comparing materials and calibrating
ultrasonic attenuation measurement equipment.
This test method applies to monolithic ceramics and also
polycrystalline metals. This test method may be applied to whisker
reinforced ceramics, particulate toughened ceramics, and ceramic
composites provided that similar constraints on sample size, shape,
and finish are met as described herein for monolithic ceramics.
This test method sets forth the constraints on sample size,
shape, and finish that will assure valid attenuation coefficient
measurements. This test method also describes the instrumentation,
methods, and data processing procedures for accomplishing the
measurements.
This test method is not recommended for highly attenuating
materials such as very thick, very porous, rough-surfaced
monolithics or composites. This test method is not recommended for
highly nonuniform, heterogeneous, cracked, defective, or otherwise
flaw-ridden samples that are unrepresentative of the nature or
inherent characteristics of the material under examination.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- attenuation coefficient
- attenuation spectrum
- material microstructure
- materials characterization
- monolithic ceramics
- nondestructive evaluation
- polycrystalline metals
- pulse-echo technique
- structural composites
- ultrasonic attenuation
- ultrasonics
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