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Now showing items 31-40 of 234
The Effect of Sand on the Wear of Anodized Aluminum
(2014-12-04)
Sand can cause excessive wear in mechanical systems, especially when the motion is frequent and small in amplitude. A modified block-on-flat wear test of anodized aluminum on hard coat anodized aluminum was used to study ...
An Analysis of the Multi-scale Structure of Rough Surfaces
(2014-12-04)
Even with the various surface finishing techniques, all surfaces are rough with different structures and geometric characteristics over multiple scales. The roughness impacts significantly the friction, wear, and surface ...
Effects of Aging on the Cyclic Stress Strain and Fatigue Behaviors of Lead-free Solders
(2014-08-18)
The microstructure, mechanical response, and failure behavior of lead free solder joints in electronic assemblies are constantly evolving when exposed to isothermal aging and/or thermal cycling environments. While the ...
An Analytical and Experimental Investigation of Nanoparticle Lubricants
(2014-07-29)
This work investigated the tribological effects of nanoparticle additives on lubrication through experimental and analytical investigations on colloidal lubricants. The focus of this dissertation was to investigate and ...
Evaluation of Beam Load Cell Use for Base Reaction Force Collision Detection on Industrial Robots
(2014-10-10)
This thesis evaluates the ability of four beam load cells placed under the base of an industrial robot to accurately estimate robot link parameters and detect collision. This setup can be a cheaper option than using ...
Robust Gain-Scheduled Observer Design with Application to Vehicle State Estimation
(2014-10-10)
This dissertation develops an application of the state-of-the-art convex optimization algorithms to the vehicle state estimation problem. The main challenge in this field is that the time-varying uncertain parameters and ...
Characterization of Die Stress in Microprocessor Packaging Due to Mechanical, Thermal, and Power Loading
(2014-08-05)
Microprocessor packaging in modern workstations and servers often consists of one or more large flip chip die that are mounted to a high performance ceramic chip carrier. The final assembly configuration features a complex ...
Analysis of Record and Playback Errors of GPS Signals Caused by the USRP
(2014-12-10)
In this thesis, the errors created by the USRP (Universal Software Receiver Platform) during record and playback are analyzed. The USRP is used for jamming, spoo fing, and
GPS processing, and has recently become widely ...
High Strain Rate Elastic and Fracture Characterization of Isotropic and Orthotropic Materials with and without Nano Fillers
(2015-07-22)
A long-bar apparatus for subjecting relatively small samples to mode-I stress-wave loading has been devised for failure characterization. A methodology based on digital image correlation (DIC) used in conjunction with ...
Extension of a Reflection-Mode Digital Gradient Sensor (r-DGS) to Study Impact Induced Deformations, Damage, and Fracture
(2015-02-23)
Reflective structures such as space mirrors, silicon wafers, solar reflectors, microelectronic devices to name a few, are made of stiff and brittle materials. They often suffer deformations and catastrophic failure when ...