3. Low-frequency ultrasonic characterization of porous materials
3.1 The benefits of ultrasonic methods
Section 2 presents some interesting methods for characterizing porous materials at low frequencies. In particular, we have seen that porosity and permeability can be determined...
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Low-frequency ultrasonic characterization of porous materials
Mechanical characterization of porous materials
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Appendix: equivalent fluid
The "effective density" and "effective modulus of compressibility" functions of the equivalent fluid must be suitably represented by the following approximate models:
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