Title

Mathematical Modeling and Dynamic Analysis of the Fast Triaxial Shear Device

Abstract

This report studies the mathematical model and dynamic behavior of the Fast Triaxial Device (FTSD). The FTSD is a triaxial cell which loads its 0.75 inch diameter by 1.5 inch long cylindrical specimen by displacing the top of the specimen downward at a rapid rate. To date, specimens ahve been brought to failure in as little as 2 milliseconds. The FTSD with a soil specimen in it is modeled as a two degree of freedom lumped mass system. Linear springs, dampers and lumpted masses represent the upper and lower load cells. A linear damper and nonlinear spring represent the soil speciment (MODEL 1). The effects of cantilever displacement guage target have been modeled as a single degree of freedom system with linear damper. This system super-imposed on MODEL 1 produces a second two degrees of freedom system (MODEL 2). A numerical method (central difference method) is used for solving the nonlinear governing differential equations of motion. The calculated FTSD properties and boundary conditional are used in the computer program to calculate the forces as well as the stress and strain. The effects of change of the FTSD properties in the system as a whole are studied, and the results for each different parameter are presented.

Notes

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Graduation Date

1989

Semester

Spring

Advisor

Carroll, William F.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Civil Engineering and Environmental Sciences

Format

Print

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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