Determination of the Complex Dynamic Bulk Modulus of Rubbery Materials Using anInverse Scattering Method

摘要

The dynamic bulk modulus of an elastomer can be determined by solving the inversescattering problem of an acoustic plane wave incident upon a spherically shaped sample. A least-squares analysis is used to find the value of the bulk modulus that is most consistent with the measured scattered pressures. The approximate value for the bulk modulus which is required to initiate the nonlinear least-squares procedure can be calculated from expressions derived from approximate relationships between the elastic constants and the first few coefficients of the series expansion for the scattered pressure. Experimental results are found to be in reasonably good agreement with values obtained via impedance tube measurements. Inverse scattering, Bulk modulus, Measurement methods.