Forward models for extending the mechanical damage evaluation capability of resonant ultrasound spectroscopy
| Autor: | Leanne Jauriqui, Tresa M. Pollock, Brent Goodlet, John C. Aldrin, Chris J. Torbet, Eric Biedermann |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Resonant ultrasound spectroscopy Materials science Acoustics and Ultrasonics business.industry Resonance 02 engineering and technology Bending Gauge (firearms) 021001 nanoscience & nanotechnology 01 natural sciences Superalloy Creep Nondestructive testing 0103 physical sciences Composite material Deformation (engineering) 0210 nano-technology business |
| Zdroj: | Ultrasonics. 77:183-196 |
| ISSN: | 0041-624X |
| DOI: | 10.1016/j.ultras.2017.02.002 |
| Popis: | Finite element (FE) modeling has been coupled with resonant ultrasound spectroscopy (RUS) for nondestructive evaluation (NDE) of high temperature damage induced by mechanical loading. Forward FE models predict mode-specific changes in resonance frequencies ( Δ f R ), inform RUS measurements of mode-type, and identify diagnostic resonance modes sensitive to individual or multiple concurrent damage mechanisms. The magnitude of modeled Δ f R correlate very well with the magnitude of measured Δ f R from RUS, affording quantitative assessments of damage. This approach was employed to study creep damage in a polycrystalline Ni-based superalloy (Mar-M247) at 950 °C. After iterative applications of creep strains up to 8.8%, RUS measurements recorded Δ f R that correspond to the accumulation of plastic deformation and cracks in the gauge section of a cylindrical dog-bone specimen. Of the first 50 resonance modes that occur, ranging from 3 to 220 kHz, modes classified as longitudinal bending were most sensitive to creep damage while transverse bending modes were found to be largely unaffected. Measure to model comparisons of Δ f R show that the deformation experienced by the specimen during creep, specifically uniform elongation of the gauge section, is responsible for a majority of the measured Δ f R until at least 6.1% creep strain. After 8.8% strain considerable surface cracking along the gauge section of the dog-bone was observed, for which FE models indicate low-frequency longitudinal bending modes are significantly affected. Key differences between historical implementations of RUS for NDE and the FE model-based framework developed herein are discussed, with attention to general implementation of a FE model-based framework for NDE of damage. |
| Databáze: | OpenAIRE |
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