Nondestructive Determination of Residual and Applied Stress by Micro-Magnetic and Ultrasonic Methods
Ultrasonic techniques can detect volume and surface stresses and they are not limited to the investigation of ferromagnetic materials as the micromagnetic methods. The magnetic nondestructive techniques are restricted by eddy current damping to surface near regions. All ferromagnetic and magnetoelastic quantities are sensitive to the mechanical stress and microstructural state of the test specimen, whereas the ultrasonic velocity is mainly influenced by changes of the stress level and the texture. The main problem is: how to separate the different influences in the measuring quantities which is required to realize a quantitative nondestructive stress-measuring device.
KeywordsResidual Stress Ultrasonic Velocity Principal Stress Direction Ultrasonic Absorption Nondestructive Determination
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