Resonant inspection has been in use for a long time. Throughout history, people have tapped parts and listened to them “ring” for an indication of their structural integrity. Resonant inspection is an ideal nondestructive testing (NDT) method because the resonance frequencies of a part correlate directly to part strength.
The physics behind PCRT stems from the simple equation for resonance:
where fr = resonant frequency
k = stiffness (Young’s modulus)
m = mass (density and dimensions)
The material properties, geometry properties, and flaws that can affect structural performance are represented by those stiffness and mass terms. Thus any change in properties that will affect structural performance will be reflected in the resonance frequencies.
What is PCRT?
Process Compensated Resonance Testing, or PCRT, combines the collection of broadband resonance data in the ultrasonic frequency range with advanced pattern recognition to produce an accurate, fast and automated non-destructive inspection for aerospace and power generation components.
Although the basic principles are simple, PCRT offers tremendous capabilities for NDT, process control and life monitoring. Download this document/these documents to learn how PCRT applies resonant inspection to yield an accurate, fast and versatile NDT method.
View these documents to learn how PCRT applies resonant inspection to yield an accurate, fast and versatile NDT method.
Introduction to PCRT – A presentation on the basic methodologies of PCRT.
The Power of PCRT – NDT magazine article
Magnaflux Vibrant Quality NDT paper – PCRT paper delivered at the 2008 Quality NDT Conference.