Accession Number:

ADA172112

Title:

Ultrasonic Characterization of Material Properties of Composite Materials,

Descriptive Note:

Corporate Author:

COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1986-07-01

Pagination or Media Count:

13.0

Abstract:

Ultrasonic waves provide an excellent means to study the mechanical properties of both heterogeneous and composite materials. Recently, both theoretically and experimentally, we studied characteristics of elastic wave propagation through fiber and particle reinforced composites. Theoretically we analyzed phase velocities of longitudinal and shear waves propagating through composite media with aligned continuous fibers and ellipsoidal shaped particles. Alignment of reinforcing fibers or particles imparts anisotropy to the effective mechanical and physical properties of the composite. Theoretically, we modeled the anisotropic phase velocities, which agree with experimental measurements. One important feature of this combined theoretical and experimental study is the possibility of obtaining the often uncertain fiber or particle elastic properties by comparing the model predictions with the observations. We show that one can use the theoretical model to obtain effective properties of media containing voids Pores. As examples, we consider porous olivine and creep cavities in copper. In the latter case some experimental results are presented which show good agreement with predictions. Finally, we present some results for attenuation in a particulate composite including the effect of nonideal interface properties. Author

Subject Categories:

  • Laminates and Composite Materials
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE