Accession Number:

ADA159927

Title:

Defects and Materials Characterization by Analysis of Ultrasonic Signals. Study of a Technique to Measure Ultrasonic Attenuation

Descriptive Note:

Final rept.

Corporate Author:

NATIONAL INST FOR AEROSPACE TECHNOLOGY MADRID (SPAIN)

Personal Author(s):

Report Date:

1985-05-01

Pagination or Media Count:

67.0

Abstract:

The objective of this work is to explore the actual possibilities of a Nondestructive testing NDT technique to be applied in laboratory conditions, as a first stage, in order to make measurements of mechanical and elastic parameters on metals. Classic test of measurement of acoustic velocity and attenuation is useful to compute Young modulus or Poisson ratio, but these parameters have no wide technological usefulness. Much more interesting are others parameters such as yield strength, tensile strength, or fracture toughness. This is of particular interest in view of the cost of destructive test to assess it. From the NDT techniques, ultrasonics seems, at a first look, a good way to intend. Ultrasonics is, first of all, a dynamic test because material is forced to transmit stress through the crystal structure. Present work describes some experiments carried out at INTAs Ultrasonic Laboratory in order to set up a technique able to take absolute attenuation measurements over a range of frequencies from 15 to 60 MHz, typically.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE