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- W2995173291 abstract "Traditional measurements of nonlinear and viscoelastic materials can be complicated by effects of frequency power law absorption and dispersion which affect harmonic generation and propagation. New combined measurement and modeling approaches are needed that account for both effects. The nonlinear interaction of two co-propagating ultrasound longitudinal waves are used to characterize induced viscoelastic changes occurring in material microstructure. A strong longitudinal wave pump affects the viscoelastic properties of the sample with dynamically applied strain and a weaker longitudinal wave probe senses induced changes. We developed a model which includes both nonlinearity and an estimation of viscoelastic characteristics to extract the second and third order nonlinear coefficients directly from the time domain data. Two samples, Lucite and Crab Orchard sandstone, have comparable viscoelastic properties but vastly different nonlinear characteristics. Additional signal processing was needed to extract parameters from the Lucite sample. Measurements for the Crab Orchard sandstone nonlinear coefficients were β =-180, and δ=-0.42*10-9, and for Lucite, they were β =−3.20, and δ=1.05*10-6. Our method can describe and quantify both the nonlinear and viscoelastic properties of materials consistently; however for materials with lower, improved instrumentation and processing are needed." @default.
- W2995173291 created "2019-12-26" @default.
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- W2995173291 date "2019-10-01" @default.
- W2995173291 modified "2023-09-27" @default.
- W2995173291 title "Measurement and Modeling of Nonlinear Power Law Media" @default.
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- W2995173291 doi "https://doi.org/10.1109/ultsym.2019.8926254" @default.
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