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Variable-thickness curved components, that have been widely used in many fields, are always caused serious accidents by the surface and subsurface defects, Therefore, how to detect and identify the variable-thickness complex shape components defects is of great significance. For the variable-thickness shape components' surface and sub-surface defects' detecting, it has been testified that surface...
Turbine disk usually cracks near the arc junction between the rim and the plate (called the root of turbine disk). This paper presents the application of an ultrasonic method to measure stresses on the root of turbine disk. The ultrasonic residual stresses measurement is based on the acoustoelastic effect that refers to the change in velocity of the elastic wave when propagating in a stressed media...
Eddy current pulsed thermography (ECPT) is an emerging non-destructive testing and evaluation (NDT&E) technique for conductive material. However, surface emissivity variation of metallic object influences accurate temperature mapping in infrared thermography, which leads to false alarm of defect detection. This paper proposes a new emissivity correction method for ECPT based on spectral reflectance...
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