超音波伝ぱ速度に基づく弾性率の特異性

概要

論文の詳細を見る
The comparison of the modulus E_p evaluated from the ultrasonic propagation speed measurements with the static modulus E_s from the tensile tests and the examination of change in E_p with tensile deformation for polythylene terephthalate (PET) fibers and glass beads filled polystyrene composites revealed the following peculiarities in E_p. (1) E_p was not linearly dependent upon the crystallinity but dependent upon the cube root of crystallinity, while E_s was directly dependent upon the crystallinity. In the case of PET fibers, the moduli, E_p and E_s, were satisfactorily described by a parallel. two-phase structure model with crystalline and amorphous regions. (2) The two-phase structure model also enabled to be applied to composite materials. Ep of the glass beads filled polystyrene composites was not linearly dependent upon the volume fraction of fillers but was dependent upon the cube root of volume fraction of fillers. In the case of glass beads filled polystyrene composites in which the adhesion between fillers and matrix was improved by silan-treating, the modulus E_s was described by the series model. In the case of untreated com-posites, E_s was constant. (3) In the case of low oriented PET fiber, E_p decreased by drawing in spite of an increase in birefringence. It is suggested that the disorder of secondary bonds are closely related to the ultrasonic propagation mechanism. (4) Ep for PET fibers increased in stress relaxation after a small deformation but decreased in stress relaxation after a large deformation.
1986-09-15

超音波伝ぱ速度に基づく弾性率の特異性

スポンサーリンク

概要

著者

関連論文

スポンサーリンク