Multiple resonances in the composite bar technique for measuring Young's modulus and internal friction

Simpson, M. E.; Finlayson, Trevor R; Smith, Trenton G.

doi:10.1088/0022-3727/11/4/009

Cited by 2 publications

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“…Also hindering the collection of data from the Au-Cd sample was the appearance of multiple resonances [12]. Multiple resonances are characterized by the appearance of many resonances occurring in a range where only one would be expected.…”

Section: Discussionmentioning

confidence: 99%

“…Multiple resonances are characterized by the appearance of many resonances occurring in a range where only one would be expected. Simpson et al [12] have shown that multiple resonances are the result of 'mode mixing', and are most likely to occur during phase transitions. These are evident from the discontinuities in the falling temperature resonance frequency curve shown in figure 5.…”

Section: Discussionmentioning

confidence: 99%

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Automated apparatus for dynamic mechanical analysis using the piezoelectric ultrasonic composite oscillator technique

Daniels¹,

Finlayson²

2006

J. Phys. D: Appl. Phys.

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Computer-controlled apparatus for the measurements of dynamic Young's modulus and internal friction as functions of temperature, using the piezoelectric ultrasonic composite oscillator technique (PUCOT), has been designed and demonstrated. The versatility of the apparatus and its resonance tracking techniques have been proven by detecting subtle structural phase transformations within the Ca1−xSrxTiO3 perovskite system as well as dramatic changes accompanying the martensitic transformation in a Au–Cd shape-memory alloy. The simplicity of the PUCOT technique allows a system such as this to be constructed easily and with low cost.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Automated apparatus for dynamic mechanical analysis using the piezoelectric ultrasonic composite oscillator technique

Daniels¹,

Finlayson²

2006

J. Phys. D: Appl. Phys.

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Penetration of magnetic field H < H c10 into Pb–In single crystals containing freshly introduced dislocations

Beloshapka,

Platkov

1984

Soviet Journal of Low Temperature Physics

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With a view to obtaining information about the superconducting properties of inhomogeneous materials we investigated the effect of a magnetic field H on internal friction in Pb–In single crystals containing freshly introduced dislocations as well as dislocations blocked by atoms of an alloying element. It was found that when fresh as well as blocked dislocations are introduced into a crystal a magnetic field H < Hc10 affects the amplitude-dependent internal friction, starting from fields H*≃0.2 Hc10. In crystals containing freshly introduced dislocations the field dependence of the damping constant and the modulus defect, measured at a fixed amplitude ε0, is represented by curves with minima near Hc10. In contrast, in crystals with blocked dislocations the dependence of the damping constant and the modulus defect on H are represented by curves with maxima near Hc10. Magnetic flux was observed to be trapped after the application of fields H <Hc10. The results suggest a local penetration of the field into an inhomogeneous superconductor when H ≪Hc10. The locally penetrating magnetic field H effectively changes the dislocation dynamics. The strong coupling of a vortex with a dislocation in fields H <Hc10 is due to a change in the critical superconducting parameters near dislocations.

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Multiple resonances in the composite bar technique for measuring Young's modulus and internal friction

Cited by 2 publications

References 1 publication

Automated apparatus for dynamic mechanical analysis using the piezoelectric ultrasonic composite oscillator technique

Automated apparatus for dynamic mechanical analysis using the piezoelectric ultrasonic composite oscillator technique

Penetration of magnetic field H < H c10 into Pb–In single crystals containing freshly introduced dislocations

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Multiple resonances in the composite bar technique for measuring Young's modulus and internal friction

Cited by 2 publications

References 1 publication

Automated apparatus for dynamic mechanical analysis using the piezoelectric ultrasonic composite oscillator technique

Automated apparatus for dynamic mechanical analysis using the piezoelectric ultrasonic composite oscillator technique

Penetration of magnetic field H &lt; H c10 into Pb–In single crystals containing freshly introduced dislocations

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Penetration of magnetic field H < H c10 into Pb–In single crystals containing freshly introduced dislocations