Browsing Auburn Theses and Dissertations by Author "Tippur, Hareesh"

Now showing items 1-20 of 32

Compression Response and Modeling of Interpenetrating Phase Composites and Foam-Filled Honeycombs

Jhaver, Rahul (2009-08-03)

Although multiphase materials with discrete, dispersed and/or embedded phases in a matrix have been evolving over the years, there are limitations in terms of the degree of concentration of the secondary phase that can be ...

Design and Calibration of Stress Sensors on 4H-SiC

Chen, Jun (2022-03-07)

Stresses in electronic packages due to thermal and mechanical loadings can cause premature mechanical failures such as fracture of die, severing of connections, die bond failure, solder fatigue, and encapsulant cracking. ...

Development of a Split Hopkinson Tension Bar for Testing Stress-Strain Response of Particulate Composites under High Rates of Loading

Owens, Anthony (2007-08-15)

Mechanical structures and their material constituents undergo an expansive range of loading conditions. Specifically, the rate at which the loading takes place can vary from being virtually static to being almost ...

Development of the Contact Models to Determine Electrical Contact Resistance Including a Coupled Electro-thermo-mechanical Analysis Considering Temperature-Dependent Material Properties

Saha, Swarna (2020-07-22)

Reliability of the electrical contact or interface is one of the major concerns in many applications such as batteries, solar cells, electrical connectors, MEMS based sensors for hybrid and electric vehicles, electronic ...

Digital Gradient Sensing (DGS): A Full-Field Optical Technique to Measure Angular Deflections of Light Rays and Its Applications to Failure Mechanics

Periasamy, Chandru (2012-07-19)

Optical transparency is an essential characteristic of solids used in many engineering applications such as automotive windshields, electronic displays, aircraft windows and canopies, hurricane resistant windows, bullet ...

Effects of Carbon Nanotube Type and Surface Functionalization on the Carbon Nanotube-Unsaturated Polyester Resin Composite Properties

Goswami, Joyanta (2016-12-19)

The goal of this research was to understand the dispersion of carbon nanotubes (CNT) in unsaturated polyester resin (UPR), the relative strength of nanotube-resin interactions, and curing into nanocomposites. These are ...

Extension of a Reflection-Mode Digital Gradient Sensor (r-DGS) to Study Impact Induced Deformations, Damage, and Fracture

Jain, Amith Subhash Chandra (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 ...

Flexural Response of Syntactic Foam Core Sandwich Structures: Effects of Graded Face Sheets and Interpenetrating Phase Composite Foam Core

Craven, Allen (2011-05-09)

In this thesis, flexural responses of sandwich structures with different syntactic foam core architectures are studied. The syntactic foam core is made by dispersing hollow glass microballoons in epoxy matrix at different ...

Fracture Behavior of Particulate Polymer Composites (PPCs) and Interpenetrating Polymer Networks (IPNs): Study of Filler Size, Filler Stiffness and Loading Rate Effects

Jajam, Kailash (2013-07-11)

Particulate Polymer Composites (PPCs) generally consist of nano- or micro-fillers of various sizes and shapes randomly dispersed in a polymer matrix. Introduction of second phase fillers of different stiffness and alteration ...

Fracture of Brittle Materials and Bimaterial Interfaces in the Presence of Compressive Stresses

Owens, Anthony (2022-12-05) ETD File Embargoed

The present work is aimed at the experimental investigation of the effect of local compressive stress fields on a crack lying along an interface. This is relevant to problems such as interfaces found in adhesively bonded ...

High Strain Rate Elastic and Fracture Characterization of Isotropic and Orthotropic Materials with and without Nano Fillers

Bedsole, Robert (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 ...

Life Prediction Analysis of a Subscale Rocket Engine Combustor using a Fluid-Thermal-Structural Model

Sarwade, Rohit (2006-05-15)

The focus of this thesis was on performing a non-linear transient fluid-thermal-structural analysis of the cooling jacket for a scale model rocket engine thrust chamber. The model was for a water cooled annular plug nozzle ...

Mechanical and Microstructural Behavior Evolution of Lead Free Solder Materials Under Different Thermal Exposures

Hasan, S M Kamrul (2023-05-01) ETD File Embargoed

With the growth of electronic packaging industries, ranging from automobile to hand-held products, reliability is a major concern. Also, to keep pace with the increasing demand of end users for integration, miniaturization, ...

Mechanical Behavior and Microstructural Evolution of Lead Free Solder Alloys in Harsh Environment Applications

Alam, Mohammad (2019-07-10)

Solder joints provide mechanical support, electrical and thermal interconnection between packaging levels in microelectronics assembly systems. Proper functioning of these interconnections and the reliability of the ...

Mechanical Characterization and Aging Induced Evolution of Cyclic Properties and Microstructure of Lead-Free Solder Materials

Chowdhury, Md Mahmudur (2020-04-29)

Solder joints in electronic assemblies are often subjected to cyclic (positive/negative) mechanical strains and stresses. Such exposures can occur in variable temperature application environments or during accelerated life ...

Microstructural effects on fracture behavior of particulate composites: Investigation of toughening mechanisms using optical and boundary element methods

Kitey, Rajesh (2006-08-15)

Particulate polymer composites are used in a variety of engineering applications. These are generally two phase materials with polymeric phase reinforced by a filler phase to improve overall mechanical, thermal and/or ...

Moisture Effects and Viscoelasticity in Polymers Used for Microelectronic Packaging

Chowdhury, Promod (2019-12-06) ETD File Embargoed

In the microelectronics packaging industry, polymer based materials are used widely. Reliable, consistent and comprehensive material property data are required for mechanical design, process optimization, and reliability ...

Nanomechanical Characterization of Aging Effects in Solder Joints

Hasnine, Md (2015-10-14)

Over the past decade, it has been demonstrated the large changes that occur in the mechanical (constitutive) response and failure behavior of lead free solders after exposure to isothermal aging. For example, measured ...

Numerical Modeling of Random 2D and 3D Structural Foams Using Voronoi Diagrams: A Study of Cell Regularity and Compression Response

Sotomayor, Oscar (2013-07-10)

Representing the complex morphology of cellular solids in general and metal foams in particular for understanding key factors governing their mechanical behavior is typically achieved using periodic unit cells. Due to the ...

Processing and Opto-Mechanical Characterization of Transparent Glass-Filled Epoxy Particulate Composites

Branch, Austin (2020-05-18)

Optically transparent materials have a wide range of applications in areas such as face shields, ground vehicle and aircraft windows, and bullet-resistant enclosures. Glass, the standard material used for applications ...