Ultrasonic Characterization of Material Properties of Composite Materials,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1986
- Accession Number
- ADA172112
Entities
People
- H. M. Ledbetter
- Subhendu K. Datta
Organizations
- University of Colorado Boulder