Now showing items 1-10 of 269
Durability of Advanced Woven Composites in Aerospace Applications
(Virginia Tech, 1999-06-16)
The objective of this project was to evaluate and model the effects of moisture, temperature, and combined hygrothermal aging on the durability of a graphite/epoxy woven composite material system. Imposed environmental ...
An experimental and theoretical investigation into the influence of hysteretic damping on the dynamic behavior of a three-beam structure
(Virginia Tech, 1996-02-05)
<p>In this thesis, we theoretically and experimentally investigate the linear and nonlinear dynamic behavior of a frame structure, which frequently occurs in engineering applications. The structure consists of three ...
Design and application of a quasistatic crush test fixture for investigating scale effects in energy absorbing composite plates
(Virginia Tech, 1993-02-05)
<p>A crush test fixture for measuring energy absorption of flat plate specimens from an earlier study was redesigned to eliminate the problem of binding of the load transfer platen with the guide posts. Further modifications ...
Finite element analysis of failure modes in dynamically loaded pre-cracked steel plates
(Virginia Tech, 1995-12-01)
Analysis of fiber-reinforced composite plates utilizing curvilinear fiber trajectories
(Virginia Tech, 1995-05-05)
<p>Four plates with centrally located circular holes were manufactured using a fiber placement technique. With two plates the fibers were steered around the holes in curvilinear trajectories. With the two other plates the ...
Feasibility of fiber reinforced composite materials used in highway bridge superstructures
(Virginia Tech, 1988-12-05)
<p>Composite materials are considered here as structural materials of highway bridge superstructures. Bridge deck designs can be done according to <i>AASHTO</i><sup>1</sup> specification and elastic design concepts. </p><p> ...
Buried Pipe Life Prediction in Sewage Type Environments
(Virginia Tech, 1999-02-06)
In this study, we develop a method of life prediction of buried pipe using the concepts of a characteristic damage state and damage accumulation. A stress analysis corresponding to the different types of load during service ...
Micromechanics-based approach to predict strength and stiffness of composite materials
(Virginia Tech, 1996-08-16)
One of the key issues concerning the durability of composites is the strength and stiffness degradation during service. Traditionally, these materials have been analyzed by methods which do not take into account variations ...
Nonlinear oscillations under multifrequency parametric excitation
(Virginia Tech, 1988-11-05)
<p>A second-order system of differential equations containing a multifrequency parametric excitation and weak quadratic and cubic nonlinearities is investigated. The method of multiple scales is used to carry out a general ...