The interaction between stress waves transmitted in solid waveguides and adjacent media.

Format:

Book

Thesis/Dissertation

Author/Creator:

Kim, Jin Oh.

Contributor:

Bau, Haim H., advisor.

University of Pennsylvania.

Language:

English

Subjects (All):

Hearing.

Mechanical engineering.

Mechanics.

0346.

0548.

0986.

Penn dissertations--Mechanical engineering.

Mechanical engineering--Penn dissertations.

Penn dissertations--Applied mechanics.

Applied mechanics--Penn dissertations.

Local Subjects:

Penn dissertations--Mechanical engineering.

Mechanical engineering--Penn dissertations.

Penn dissertations--Applied mechanics.

Applied mechanics--Penn dissertations.

0346.

0548.

0986.

Physical Description:

243 pages

Contained In:

Dissertation Abstracts International 51-01B.

System Details:

Mode of access: World Wide Web.

text file

Summary:

The effects of adjacent media on the characteristics of torsional stress waves propagating in submerged or embedded elastic waveguides were studied theoretically and experimentally. Analytical and numerical methods were used to predict the speed and attenuation of stress waves interacting with adjacent fluid or solid. Experiments were carried out to confirm the theoretical predictions. The goals of this research were to identify the relationship between the characteristics of the stress waves and the properties of adjacent media, and to develop on-line real-time sensors for the measurement of media properties.

First, the theory of torsional stress wave propagation in traction-free waveguides has been reviewed and expanded upon. Dispersion relations were obtained for uniform waveguides with various noncircular cross-sectional geometries and for waveguides with a circular cross-section whose area varies periodically along the waveguide's axis.

Next, stress wave propagation in waveguides submerged in fluid media was considered. Dispersion relations were obtained for waveguides of noncircular and circular cross-sections submerged in inviscid and viscous liquids. It was demonstrated that the effects of the adjacent medium on stress wave propagation can be utilized for the measurement of liquid's density, viscosity, and other related properties. The feasibility of measuring concentration of solid particles in suspensions was also evaluated.

Finally, a feasibility study was conducted to assess the possibility of obtaining information on the fiber-matrix interface in composite materials by monitoring stress wave propagation in the fiber itself. Knowledge of the interphase properties may be useful to predict the mechanical properties of undamaged and damaged composite materials on the one hand and to detect damage on the other hand.

Notes:

Thesis (Ph.D. in Mechanical Engineering and Applied Mechanics) -- Graduate School of Arts and Sciences, University of Pennsylvania, 1989.

Source: Dissertation Abstracts International, Volume: 51-01, Section: B, page: 0386.

Supervisor: Haim H. Bau.

Local Notes:

School code: 0175.

Access Restriction:

Restricted for use by site license.