Resonant ultrasound spectroscopy for crystalline samples containing initial strain

Article Physics, Multidisciplinary

Thermodynamic evidence for a two-component superconducting order parameter in Sr2RuO4

Sayak Ghosh et al.

Summary: Sr2RuO4 has been considered the leading candidate for a spin-triplet superconductor for 26 years, but recent experiments have raised doubts. Observations of a thermodynamic discontinuity in the shear elastic modulus suggest a two-component superconducting order parameter. Therefore, two other two-component order parameters are now seen as the prime candidates for the order parameter of Sr2RuO4.

NATURE PHYSICS (2021)

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Article Materials Science, Multidisciplinary

Bayesian inference of elastic constants and texture coefficients in additively manufactured cobalt-nickel superalloys using resonant ultrasound spectroscopy

Jeff Rossin et al.

Summary: Bayesian inference with sequential Monte Carlo is used to quantify orientation distribution function coefficients and calculate fully anisotropic elastic constants of additively manufactured specimens based on experimentally measured resonant frequencies. The method also considers residual stress-induced shifts on resonant frequencies, allowing for accurate estimation without stress-relief heat treatment. Through this approach, the accurate determination of all 21 possible independent elastic constants is achieved.

ACTA MATERIALIA (2021)

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Article Physics, Applied

Determination of third-order elastic constants using change of cross-sectional resonance frequencies by acoustoelastic effect

Bonggyu Ji et al.

Summary: A new measurement technique for third-order elastic constants using the acoustoelastic effect is presented in this investigation. The method involves measuring cross-sectional resonance frequencies of a cylindrical rod under tensional load to determine Murnaghan's third-order elastic constants. Electromagnetic acoustic transducers (EMATs) are used to enhance repeatability and minimize variations in contact conditions between the transducer and specimen. The estimated Murnaghan's constants show excellent repeatability and reproducibility, with coefficients of variation less than 6.54% in repeated tests on several specimens.

JOURNAL OF APPLIED PHYSICS (2021)

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Article Acoustics

Influence of residual stress and texture on the resonances of polycrystalline metals

Christopher M. Kube et al.

Summary: The study demonstrates that residual stress and texture have a significant impact on the resonance frequencies and mode shapes of AM parts in the resonant ultrasound spectroscopy (RUS) environment, supporting the potential of using RUS to sense material properties. Neglecting stress and texture could lead to misinterpretation of RUS measurements and incorrect diagnosis when qualifying AM parts.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2021)

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Article Acoustics