Search results | J. Murrey Atkins Library

Title: A Semi-Quantitative Schlieren High-Speed Flow Diagnostic: Analysis of High-Pressure-Ratio, Overexpanded Planar Flow in Rocket Nozzles
Author: Thorsett-Hill, Karen
Date Created: 2012
Subjects--Topical: Mechanical engineering
Description: This work introduces a semi-quantitative schlieren (SQS) method which is used to qualitatively and quantitatively analyze complex, unsteady, compressible flows in a small, planar convergent-divergent nozzle. A basic schlieren system is used to ima...

Title: CONSTITUTIVE MODELING OF ALUMINUM FOAM AND FINITE ELEMENT IMPLEMENTATION FOR CRASH SIMULATIONS
Author: Bi, Jing
Date Created: 2012
Subjects--Topical: Mechanical engineering, Engineering
Description: In the past decades metallic foams have been increasingly used as filler materials in crashworthiness applications due to their relatively low cost and high capacity of energy absorption. Due to the destructive nature of crashes, studies on the pe...

Title: Constitutive Modeling and Dynamic Impact Analysis of Bighorn Sheep Horn
Author: Li, Zheng
Date Created: 2022
Subjects--Topical: Mechanical engineering
Description: Bighorn sheep (Ovis canadensis) is known for its giant spiral horns that can sustain impact loading at a speed up to 5.5 m/s during ramming without causing severe damage or head concussion. The bighorn sheep horn is composed of a keratin-based bio...

Title: DEVELOPMENT, VERIFICATION, AND VALIDATION OF AN APPLIED ELEMENT METHOD SIMULATION FRAMEWORK FOR GLASS LITE FRACTURE, FRAGMENTATION, AND DEBRIS FIELD PREDICTION
Author: Moss, Jonathan
Date Created: 2020
Subjects--Topical: Mechanical engineering, Engineering
Description: In the aftermath of an explosive event, forensic investigators are presented the challenge of characterizing the properties of the explosive device, including the charge size and epicenter of the detonation. Although surrounding infrastructure dam...

Title: Finite Element Modeling and Simulations of Tractor-Trailer Impacts on Highway Median Barriers
Author: Gutowski, Matthew
Date Created: 2017
Subjects--Topical: Mechanical engineering
Description: Roadside safety hardware systems play a vital role in reducing both the number and severity of multi-vehicular collisions by preventing errant vehicles from traversing through an open median into oncoming traffic. The safety hardware used to preve...

Title: Finite element modeling and simulation of occupant responses in highway crashes
Author: Li, Ning
Date Created: 2014
Subjects--Topical: Mechanical engineering, Mechanics
Description: Roadside barrier systems play an important role in reducing the number of fatalities and the severity of injuries in highway crashes. After decades of work by researchers and engineers, roadside barriers have been improved and are generally effect...

Title: HYDRODYNAMIC SIMULATIONS OF EJECTA PRODUCTION FROM SHOCKED METALLIC SURFACES
Author: Karkhanis, Varad
Date Created: 2017
Subjects--Topical: Mechanical engineering, Mechanics, Aerospace engineering
Description: The phenomenon of mass ejection into vacuum from a shocked metallic free surfaces can have a deleterious effect on the implosion phase of the Inertial Confinement Fusion (ICF) process. Often, the ejecta take the form of a cloud of particles that a...

Title: MULTI-SCALE FINITE ELEMENT MODELING OF MULTI-PLY WOVEN FABRICS UNDER BALLISTIC IMPACTS
Author: Palta, Emre
Date Created: 2019
Subjects--Topical: Mechanical engineering, Mechanics, Engineering
Description: High-strength fiber reinforced woven fabrics are broadly utilized for their high strength-to-weight ratios and good flexibility to provide ballistic protection in security applications such as soft body armor equipment or protective layering of mi...

Title: Multiscale modeling of the properties of two-dimensional materials
Author: Wang, Xiaonan
Date Created: 2017
Subjects--Topical: Mechanical engineering
Description: The main objective of this dissertation is to study the thermal and mechanicalproperties of two dimensional materials. For this purpose, we use and combine atomiclevel simulations with continuum level simulations. In this dissertation, moleculardy...

Title: NUMERICAL EVALUATION OF RETROFIT DESIGNS OF CABLE MEDIAN BARRIERS USING RECLAIMED TIRES
Author: Badar, Amey
Date Created: 2017
Subjects--Topical: Mechanical engineering
Description: This thesis presents a research attempt at finding out a viable retrofit system design for cable median barriers using reclaimed tires. Finite element analysis was used to conduct simulations in order to evaluate the performance of retrofit barrie...

Title: PERFORMANCE EVALUATION OF A TWO-BAR BRIDGE RAIL FOR COMPLIANCE WITH MASH TL-3 CONDITIONS USING FINITE ELEMENT ANALYSIS
Author: Fatoki, Joshua
Date Created: 2020
Subjects--Topical: Mechanical engineering
Description: Roadside barriers are important safety devices installed on highways to mitigate the severity of injuries caused by crashes of errant vehicles. The two-bar metal bridge rail is a commonly used roadside barrier in North Carolina and is recognized f...

Title: STUDY OF HYBRID STRATEGIES FOR MULTI-OBJECTIVE OPTIMIZATION USING GRADIENT BASED METHODS AND EVOLUTIONARY ALGORITHMS
Author: Paez Bautista, Diego
Date Created: 2013
Subjects--Topical: Mechanical engineering, Mathematics
Description: Most of the optimization problems encountered in engineering have conflicting objectives. In order to solve these problems, genetic algorithms (GAs) and gradient-based methods are widely used. GAs are relatively easy to implement, because these al...