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Finite Element Modeling of Tow-Placed Variable-Stiffness Composite Laminates
(Virginia Tech, 1999-05-26)
Tow-placement machines have made it possible to manufacture curved-fiber composite tow paths. A composite structure with curved-fiber tow paths can be formed in a manner similar to filament winding. The result is a laminate ...
Parameter Identification of Nonlinear Systems Using Perturbation Methods and Higher-Order Statistics
(Virginia Tech, 1998-08-03)
A parametric identification procedure is proposed that combines
the method of multiple scales and higher-order statistics to
efficiently and accurately model nonlinear
systems. A theoretical background for the method ...
Nonlinear transverse vibrations of centrally clamped rotating circular disks
(Virginia Tech, 1999-03-02)
A study is presented of the instability mechanisms of a damped axisymmetric circular disk of uniform thickness rotating about its axis with constant angular velocity and subjected to various transverse space-fixed loading ...
Characterization and Modeling of a Fiber-Reinforced Polymeric Composite Structural Beam and Bridge Structure for Use in the Tom's Creek Bridge Rehabilitation Project
(Virginia Tech, 1998-12-12)
<p> Fiber reinforced polymeric (FRP) composite materials are beginning to find use in construction and infrastructure applications. Composite members may potentially provide more durable replacements for steel and concrete ...
Energy Absorption Capacity of Graphite-Epoxy Composite Tubes
(Virginia Tech, 1998-11-11)
The energy absorption capacity of a series of axially crushed composite tubes fabricated from high tow count graphite fiber is compared with those of similar tubes fabricated from aerospace-grade fiber to determine the ...
Effect of Material and Geometric Parameters on Deformations of a Dynamically loaded Prenotched Plate
(Virginia Tech, 1998-09-18)
We analyze plane strain thermomechanical deformations of a prenotched rectangular plate impacted on one side by a prismatic body of rectangular cross-section and moving parallel to axis of the notch. Both the plate and the ...
Acousto-Ultrasonic Evaluation of Cyclic Fatigue of Spot Welded Structures
(Virginia Tech, 1997-08-28)
An acousto-ultrasonic approach is used to explore the damage
development in tensile shear spot welds during fatigue
loading. There is reasonable data to support the hypothesis
that a decrease in an AU signal is indicative ...
Analysis of Time-Varying Characteristics of Simulated Turbulence in Wind Tunnel
(Virginia Tech, 1999-05-28)
Eight roughness configurations in Clemson boundary layer wind tunnel are presented. For these configurations, flow parameters such as turbulent intensities, integral length scales, large- and small- scale turbulence, and ...
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 ...
Experimental Analysis of an Advanced-Design, Quasi-Radial Diffuser Receiving an Oscillating Jet
(Virginia Tech, 1997-07-01)
Methods of experimental analysis of airflow through an advanced-design, quasi-radial
diffuser receiving an oscillating jet induced by a rotating baffle were devised and
performed. The initially unsteady flow was found to ...