摘要:
An ultrasonic inspection element and method are provided for improved ultrasonic inspection of curved entry surface parts (28). The transducer element (24) may be spherically focused, or have a flat surface. The transducer/mirror element combination (12, 24) is used to inspect through a concave or convex surface (26). A mirror element (12) shapes the sound beam relative to the shape of the curved surface (26) of the part (28) being inspected. Curvature of the mirror (12) is adjusted with a screw, rod, voltage modulator, or other suitable adjustment mechanism. An alternative mechanism includes multiple "quick disconnect" interchangeable curved mirror elements.
摘要:
The present disclosure provides for the application of a two-dimensional ultrasonic phased array (100), formed of a plurality of transducers (102) arranged in a rectilinear pattern, for material and volumetric component testing. The two-dimensional array enables electronic adjustment of the focal properties and size of the aperture (104) in both the azimuthal (X) and elevational (Z) directions such that uniform and/or specified sound field characteristics can be obtained at any or all locations in the component being tested.
摘要:
A method of inspecting a component (10) includes immersing the component in a coupling medium (22) with material velocity C w and immersing an ultrasonic (UT) probe (20) having at least one transducer (12) in the coupling medium. The UT probe has a convex lens (14) with acoustic velocity C L and an acoustic impedance less than about 2.5 x 10 6 Rayls. The method further includes exciting the transducer to produce an UT pulse directed into the component and generating echo signals using the transducer as a receive element (12). An UT inspection system (30) includes UT probe, a pulser/receiver (32) configured to supply signal excitation pulses to the transducer element at a pulse repetition frequency (prf) of at least about 1000 Hz and a scanner (34) configured to scan the component with the UT probe at a scanning rate equal to the prf times a scanning increment.
摘要:
An ultrasonic inspection element and method are provided for improved ultrasonic inspection of curved entry surface parts (28). The transducer element (24) may be spherically focused, or have a flat surface. The transducer/mirror element combination (12, 24) is used to inspect through a concave or convex surface (26). A mirror element (12) shapes the sound beam relative to the shape of the curved surface (26) of the part (28) being inspected. Curvature of the mirror (12) is adjusted with a screw, rod, voltage modulator, or other suitable adjustment mechanism. An alternative mechanism includes multiple "quick disconnect" interchangeable curved mirror elements.
摘要:
A method for setting up a transparent confinement media nozzle (123) for flowing the confinement media (121) during laser shock peening (LSP) of a work piece (108) includes the following steps: Step A) flowing a confinement media (121) and setting a flow rate of the confinement media through a confinement media flow nozzle (123); Step B) positioning the nozzle (123) to flow the confinement media through the nozzle (123) and onto the correlation surface (154); and Step C) measuring a confinement media layer thickness (T) on the correlation surface (154) using an ultrasonic transducer (20) attached to a side (148) of the test piece opposite that of the correlation surface (154). One embodiment of the invention employs the work piece (108) as the test piece and the correlation surface (154) is a first laser shock peening surface (154) on a first side of the work piece (108). Further embodiments includes Step D) comparing the measured and recorded confinement media layer thickness (T) from Step C) against a predetermined value or range of values for confinement media layer thickness (T) and Step E) determining whether to reset the confinement media flow rate and/or nozzle position or proceeding with the laser shock peening (LSP) of the work piece (108) with the confinement media flow rate and nozzle position set in Step A) based on the comparison in Step D).
摘要:
A method of inspecting a component (10) includes immersing the component in a coupling medium (22) with material velocity C w and immersing an ultrasonic (UT) probe (20) having at least one transducer (12) in the coupling medium. The UT probe has a convex lens (14) with acoustic velocity C L and an acoustic impedance less than about 2.5 x 10 6 Rayls. The method further includes exciting the transducer to produce an UT pulse directed into the component and generating echo signals using the transducer as a receive element (12). An UT inspection system (30) includes UT probe, a pulser/receiver (32) configured to supply signal excitation pulses to the transducer element at a pulse repetition frequency (prf) of at least about 1000 Hz and a scanner (34) configured to scan the component with the UT probe at a scanning rate equal to the prf times a scanning increment.
摘要:
A method and system for microstructural evaluation and degradation evaluation of an object (14) are provided. The method comprises insonifying at least one subvolume of the object with ultrasonic energy at a fundamental frequency and acquiring receive energy from the object at the fundamental frequency and at least one harmonic frequency thereof. A nonlinearity parameter is determined using the receive energy. The nonlinearity parameter is then used to determine a grain size for the subvolume of the object and a variation of the grain size within the object. The nonlinearity parameter is also used to determine fatigue damage or residual stress.