616 粒子強化粘弾性複合材料における超音波減衰挙動の解析

概要

論文の詳細を見る
The present paper addresses a numerical modeling of ultrasonic attenuation in particle-reinforced composites based on wave scattering theory. In particular, the viscoelastic nature of the matrix is explicitly taken into account. It is assumed that the ultrasonic attenuation loss in composites consists of the absorption loss in the matrix as well as the particles, and the scattering loss due to the inhomogeneity. An energy estimate for these loss mechanisms is illustrated, and a simple formula is given for the overall attenuation coefficient of the composite. A numerical example is obtained for longitudinal waves propagating in a glass-particle reinforced epoxy-matrix composite. The results show that the attenuation coefficient of the composite may or may not exceed the matrix attenuation coefficient depending on the relative magnitude of certain measures of scattering versus absorption losses.
2000-07-31