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Crack Sizing

Last updated: November 5, 2019

What Does Crack Sizing Mean?

Crack sizing is the calibration and measurement of any prospective cracks in industrial equipment or structures that can be a defect or pose a hazard. Crack sizing generally takes into account the depth, length and width of the crack. Usually two types of cracks are possible in metal and concrete structures:

  • Moving cracks
  • Non-moving cracks

Corrosionpedia Explains Crack Sizing

Crack sizing is the measurement of a crack's size and determining the crack's ability to move further into the body of the structure.

With the help of ultrasonic transducer techniques, crack depth is determined by analyzing the waves reflected, transmitted or diffracted by the crack. Using certain ultrasonic transducer (UT) techniques, the defect characteristics, if any, can be inspected and necessary actions taken to rectify them. Transducers were specifically developed for the detection and sizing of cracks in 1955.

Some techniques for ultrasonic crack detection and sizing are:

  • Conventional ultrasonic transducers that make use of the amplitude drop technique.
  • Amplitude comparison technology.
  • Multi beam and multi mode transducer techniques.
  • High angle dual element transducer techniques.
  • Bi-modal technique.
  • Creeping and guided wave techniques.
  • Forward and backward diffraction techniques.
  • Satellite pulse technique.

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