Acoustic properties of materials with reduced Poisson ratio.

Poisson ’ s ratio in cubic materials

Expressions are given for the maximum and minimum values of Poisson’s ratio ν for materials with cubic symmetry. Values less than −1 occur if and only if the maximum shear modulus is associated with the cube axis and is at least 25 times the value of the minimum shear modulus. Large values of |ν| occur in directions at which the Young’s modulus is approximately equal to one half of its 111 valu...

The properties of copper foams with negative Poisson ' s ratio via resonant ultrasound spectroscopy

1 College of Sciences, Northeastern University, Shenyang 110819, PR China 2 Materials Science Program, University of Wisconsin, Madison, WI 53706-1687, USA 3 Department of Engineering Physics, University of Wisconsin, Madison, WI 53706-1687, USA

Acoustic materials

Testing the ratio of two poisson rates.

In this paper we compare the properties of four different general approaches for testing the ratio of two Poisson rates. Asymptotically normal tests, tests based on approximate p -values, exact conditional tests, and a likelihood ratio test are considered. The properties and power performance of these tests are studied by a Monte Carlo simulation experiment. Sample size calculation formulae are...

HIGH TEMPERATURE ELASTIC PROPERTIES OF REFRACTORY MATERIALS

Abstract: A pulse-echo technique, based on ultrasonic "long-bar" mode (LBM) velocity measurements, working up to 1700°C is described. Magnetostrictive transducers and ultrasonic lines used in a 40-85 kHz frequency range are detailed. The conditions of choice of fundamental parameters (frequency, line geometry, sample size) are discussed in relation with the nature and the microstructure of ...