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Full-Text Articles in Applied Mechanics

Innovation Of Driving Gear Train System For Developer Unit Of Lexmark Home Printers, Jay A. Crist, Sarah Gore, Kun Xie, Michael Mixoon Aug 2017

Innovation Of Driving Gear Train System For Developer Unit Of Lexmark Home Printers, Jay A. Crist, Sarah Gore, Kun Xie, Michael Mixoon

Chancellor’s Honors Program Projects

No abstract provided.


Synergy Between Chemical Dissolution And Mechanical Abrasion During Chemical Mechanical Polishing Of Copper , Wei Che Jan 2005

Synergy Between Chemical Dissolution And Mechanical Abrasion During Chemical Mechanical Polishing Of Copper , Wei Che

Retrospective Theses and Dissertations

Chemical mechanical planarization (CMP) is a mainstream semiconductor processing method for achieving local and global wafer planarization. However, the CMP process fundamentals are poorly understood, and thereby inhibit migratability of lab-scale experiments to production processes. This work addresses the synergistic role of chemical dissolution rate (CDR) and mechanical abrasion rate (MAR) on the material removal mechanisms during CMP process.;A set of nano-wear experiments on elecro-plated copper surfaces are conducted with systematic exposure to active slurry. Initial results of in situ wear test in chemically active slurry showed an increased material removal rate (MRR) relative to a dry wear test ...


Fatigue Life Investigation Of Solid And Hollow Rollers In Pure Rolling Contact , Wisam M. Abu Jadayil Jan 2005

Fatigue Life Investigation Of Solid And Hollow Rollers In Pure Rolling Contact , Wisam M. Abu Jadayil

Retrospective Theses and Dissertations

Solid and hollow cylindrical rollers in pure rolling contact have been modeled using the finite element package, ABAQUS, to study the stress distribution and the resulting deformations in the rollers' bodies when the two rollers are subjected to a pure normal loading or to a combined normal and tangential loading. The tangential loading is one third of the normal loading value. Then the Ioannides-Harris fatigue life model for rolling bearings has been applied on the ABAQUS numerical results to investigate the fatigue life of the solid and hollow rollers. Using the fatigue life of the solid rollers as the reference ...


Interactive Stress Re-Analysis In Virtual Reality , Kurt Anthony Chipperfield Jan 2002

Interactive Stress Re-Analysis In Virtual Reality , Kurt Anthony Chipperfield

Retrospective Theses and Dissertations

This research combines virtual reality with fast stress re-analysis/approximation methods, meshless stress analysis, and free-form deformation (FFD) to produce a virtual design environment that allows interactive stress re-analysis. The interactive stress re-analysis program allows designers to visualize the initial stresses in their design, then modify the design while watching the stresses update as the design is changed.;The primary objective of this research is to find the best stress re-analysis method for use in the virtual design environment. The pre-conditioned conjugate gradient (PCG) iterative method is compared with respect to accuracy and speed with the combined approximation (CA) method ...


Chip-Controlled 3-D Complex Cutting Tool Insert Design And Virtual Manufacturing Simulation , Shizhuang Luo Jan 1999

Chip-Controlled 3-D Complex Cutting Tool Insert Design And Virtual Manufacturing Simulation , Shizhuang Luo

Retrospective Theses and Dissertations

Designing suitable tools for the turning operation is of vital interest to manufacturers. The tool inserts used nowadays adopt complex geometric shapes. A question facing many manufacturers is how to effectively design complex shaped tool inserts and how to prove the validity of such design. One of the important criteria for selecting inserts is the ability to control chip formation and chip breaking;The research work described in this dissertation attempted to bring innovation into the cutting tool insert design process by using feature-based modeling and by proposing a predictive chip model and integrating it into the design process. Such ...


The Dynamics Of Liquids In Moving Containers: Numerical Models For Viscous Unsteady Free Surface Flows , Adonis C. Kassinos Jan 1997

The Dynamics Of Liquids In Moving Containers: Numerical Models For Viscous Unsteady Free Surface Flows , Adonis C. Kassinos

Retrospective Theses and Dissertations

The transportation and control of liquid masses poses a problem of immense practical interest. Slosh forces generated by the motion of the liquid can easily interfere with the safe operation of the vehicle. The successful design and execution of such operations depends upon not only the understanding, but also the ability to predict the dynamic behavior of liquids in moving containers;The numerical simulation of liquid sloshing in moving containers is considered in this study. Numerical models are developed and applied to both two and three dimensional flows. The motion of the vehicle can be quite general, given by the ...


A Compliant Model For Estimation And Optimization Of Damping In Vibrating Structures , Thomas Jeffrey Thompson Jan 1995

A Compliant Model For Estimation And Optimization Of Damping In Vibrating Structures , Thomas Jeffrey Thompson

Retrospective Theses and Dissertations

Proposed future space missions involve large structures which must maintain precise dimensional tolerances even during dynamic maneuvers. In order to attenuate disturbances in the many modes of vibration of such a structure, active and passive vibration control are proposed. The passive control is to be achieved by placing viscous or viscoelastic members or materials within a structure in order to absorb energy. Ascertaining the best combination of locations for such treatments is difficult due to the large number of cases, each of which requires computationally expensive complex eigenvalue analyses of a finite element model to compute modal damping values;In ...


An Investigation Of The Mechanics Of Rollover For Cars And Light Trucks , Yvonne Irene Katherine Lund Jan 1995

An Investigation Of The Mechanics Of Rollover For Cars And Light Trucks , Yvonne Irene Katherine Lund

Retrospective Theses and Dissertations

Rollover of cars and light trucks in single vehicle accidents is of great interest to designers in the automotive industry and to regulators in government agencies. This thesis addresses metrics--the static stability factor, the tilt table ratio, the side pull test, and the critical sliding velocity--which are proposed measures of vehicle resistance to rollover;A notable finding is that the critical sliding velocity, CSV, is independent of the vehicle mass and roll moment of inertia and depends only on the track width and center of gravity height. Furthermore, while side pull testing and tilt table testing are mainly dependent on ...


Using Size Sensitivities To Guide Structural Shape Optimization , Afshin Mikaili Jan 1992

Using Size Sensitivities To Guide Structural Shape Optimization , Afshin Mikaili

Retrospective Theses and Dissertations

Conventional finite-element-based structural shape optimization requires the calculation of grid sensitivities which are much more expensive to compute than size sensitivities. This thesis presents a new method of shape optimization which is based on using size sensitivities to guide shape redesign. In this method a thin layer of plate elements is cast on selected free surfaces of structures modeled with solid elements, or in the case of structures modeled with plate elements, selected free edges are covered with a thin lining of beam elements. While the performance of the structure remains virtually unaffected by introducing these nearly zero section elements ...


Prediction Of Diesel Engine Particulate Emission During Transient Cycles, Qiqing Jiang Jan 1991

Prediction Of Diesel Engine Particulate Emission During Transient Cycles, Qiqing Jiang

Retrospective Theses and Dissertations

A computer model has been developed to predict diesel engine particulate emission during transients in speed and torque. The computer model consists of a quasi-steady-state engine combustion model, a dynamic engine model, and a dynamic turbocharger model. The model predictions were compared to experimentally measured particulate emissions. Particulate matter was measured under steady-state conditions, over an EPA transcient cycle, and for discrete segments of various transient cycles;The computer model accurately predicts engine air flow rate, turbocharger speed, and instantaneous engine equivalence ratio. The fuel consumption given by the model is within 3% of the experimental measurement over the transient ...


A Second-Order Method Of Characteristics For Two-Dimensional Unsteady Flow With Application To Turbomachinery Cascades , Robert Anthony Delaney Jan 1974

A Second-Order Method Of Characteristics For Two-Dimensional Unsteady Flow With Application To Turbomachinery Cascades , Robert Anthony Delaney

Retrospective Theses and Dissertations

No abstract provided.


Effects Of Longitudinal Impact On The Fracture Of Round Plaster Rods , Edwin Curgus Lindly Jan 1964

Effects Of Longitudinal Impact On The Fracture Of Round Plaster Rods , Edwin Curgus Lindly

Retrospective Theses and Dissertations

No abstract provided.