Accession Number : ADA180204

Title :   Dynamic Behavior of Fiber and Particle Reinforced Composites.

Descriptive Note : Annual rept. 21 Apr 86-20 Apr 87,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Datta,Subhendu K

PDF Url : ADA180204

Report Date : 28 Apr 1987

Pagination or Media Count : 5

Abstract : Full anisotropic behavior of fiber reinforced composites has been studied. Comparison of model predictions with available experiments shows excellent agreement. This also allows the determination of anisotropic fiber properties in an inverse fashion. We have also studied the frequency dependence of phase velocities and attenuation in a particle reinforced composite allowing for the effect of non-perfect interfaces. Simultaneously we have examined ultrasonic scattering by surface-breaking cracks. In particular, we have studied the effect of crack branches on the ultrasonic signal. Scattering of ultrasonic SH waves by buried canted cracks in a thick plate has also been investigated. Here the results of calculations show excellent agreement with available experiments.

Descriptors :   *ACOUSTIC SCATTERING, *ANISOTROPY, *DYNAMIC RESPONSE, *ULTRASONIC TESTS, COMPARISON, COMPOSITE MATERIALS, DYNAMICS, FIBER REINFORCED COMPOSITES, FIBERS, FREQUENCY, MODELS, PARTICLES, PHASE, PREDICTIONS, REINFORCING MATERIALS, SCATTERING, SIGNALS, ATTENUATION, ULTRASONICS, VELOCITY, CRACK PROPAGATION, PLATES, MICROCRACKING

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE