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首页> 美国政府科技报告 >Defects and Materials Characterization by Analysis of Ultrasonic Signals. Study of a Technique to Measure Ultrasonic Attenuation
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Defects and Materials Characterization by Analysis of Ultrasonic Signals. Study of a Technique to Measure Ultrasonic Attenuation

机译：超声信号分析的缺陷与材料表征。超声衰减测量技术研究

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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 INTA's 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.

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