Sound Waves in Solids

Pollard, H. F.; Herrmann, G.

doi:10.1115/1.3424470

Cited by 58 publications

(100 citation statements)

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“…From d, vl and vs, the Young's modulus, E, and the Poisson's ratio v, were calculated with the usual formula for isotropic materials. No correction for damping was applied since the loss tangent was less than 0.05 [9]. The standard deviation in the Young's modulus was estimated to be about 2 GPa.…”

Section: Methodsmentioning

confidence: 99%

New ternary nitride ceramics: CaSiN2

Groen

Kraan

With

1994

JOURNAL OF MATERIALS SCIENCE

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The synthesis of CaSiN 2 powder, starting from metal nitrides, is described. Fully dense CaSiN 2 ceramics can be sintered from the prepared powder at 1700~ The samples were sintered in a closed Mo vessel to prevent evaporation of calcium nitride. The phase composition, and the chemical and mechanical properties of the as-prepared ceramics are described. The thermal conductivity at room temperature was evaluated as 2.4 Wm -1 K -1 . A reasonable strength of 179 MPa and a fairly good fracture toughness of about 2.1 MPam ~/2 were found. A hardness of 9.6 GPa and a Young's modulus of 174 GPa were measured. The value of the relative dielectric constant was measured as 13.3. The bandgap for CaSiN 2 at room temperature was estimated from diffuse-reflectance spectra to be 4.5 eV. Considerable improvement in the properties are expected when the processing conditions which is well within reach are optimized.

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Section: Methodsmentioning

confidence: 99%

New ternary nitride ceramics: CaSiN2

Groen

Kraan

With

1994

JOURNAL OF MATERIALS SCIENCE

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“…In order for a stress wave to travel through a soil mass it must pass from particle to particle. When mechanical wave energy strikes the boundary between two particles a proportion of the energy will be transmitted in to the second particle while the rest is reflected back into the original particle (Pollard 1977). Soil therefore attenuates high levels of energy over short distances and this necessitates the implementation of the waveguide.…”

Section: Introductionmentioning

confidence: 99%

Quantification of reactivated landslide behaviour using acoustic emission monitoring

et al. 2014

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“…Materials with mechanical anisotropy are routinely employed to build waveguides, and their behaviour is modelled by taking into account the adequate compliance tensor for the material (Pollard, 1977). The important case of hexagonal symmetry is found in waveguides with transverse isotropy (with respect to the propagation axis z), like beryllium, or in fiber reinforced composite cylinders.…”

Section: Anisotropic and Fluid-loaded Waveguidesmentioning

confidence: 99%