Featuresof determination of microlaminate elasticity characteristics by results of speed elastic waves measurement

Abstract

For the practical use of new materials, it is necessary to know their elastic characteristics. The experimental determination of elasticity characteristics by ultrasonic methods requires a functional connection between them and the propagation velocities of the measured elastic waves. In each composite with a complex structure, this connection has its own differences, which must be investigated. As a result of the analysis of the structural features of microlaminate by physical modeling for a given composite structure, its elasticity properties are estimated from the values of these characteristics for individual initial components and their volume concentration. Through acoustic modeling, a functional relationship is established between the elasticity characteristics of the microlaminate and the propagation velocities of elastic waves in it. The features of the formation of acoustic fields in a microlaminate based on Fe―Cu layers were experimentally investigated. An original acoustic experiment was carried out to evaluate the characteristics of elasticity by measuring the propagation velocities of the zero mode of a normal symmetric elastic wave. The results of experimental and theoretical estimates of elasticity characteristics are compared. It is shown that theoretical estimates give 6―17% higher results and do not take into account that, as a result of rolling, the material acquires a texture that is characterized by a 14% difference in elasticity characteristics in different directions. Full text download