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Full-Text Articles in Engineering Science and Materials
High Strain Rate Properties Of Polymer Matrix Composites, Amol Jadhav
High Strain Rate Properties Of Polymer Matrix Composites, Amol Jadhav
LSU Master's Theses
The vast differences in strength, ultimate strain and modulus during high strain rate (HSR) deformation of materials have been a very long-standing subject of engineering interest. This thesis deals with characterization of mechanical properties of two composite materials, balanced angle-ply graphite epoxy laminates (fibrous composite) and syntactic foams (particulate composite). The focus of this study is to compare the mechanical properties of these composite materials at high strain rates and quasi-static conditions and to find out the effects of failure modes on HSR mechanical properties of these materials. Split Hopkinson Pressure Bar (SHPB) apparatus is used for the HSR testing …
Tensile Strength And Bonding Characteristics Of Self-Compacting Concrete, Cristian Druta
Tensile Strength And Bonding Characteristics Of Self-Compacting Concrete, Cristian Druta
LSU Master's Theses
Self-compacting concrete, also referred to as self-consolidating concrete, is able to flow and consolidate under its own weight and is deaerated almost completely while flowing in the formwork. It is cohesive enough to fill the spaces of almost any size and shape without segregation or bleeding. This makes SCC particularly useful wherever placing is difficult, such as in heavily-reinforced concrete members or in complicated workforms. The objectives of this research were to compare the Splitting Tensile Strength and Compressive Strength values of self-compacting and normal concrete specimens and to examine the bonding between the coarse aggregate and the cement paste …
Synthesis, Structure And Properties Of Nanolayered Dlc/Dlc Films, Pankaj Gupta
Synthesis, Structure And Properties Of Nanolayered Dlc/Dlc Films, Pankaj Gupta
LSU Master's Theses
Diamondlike carbon (DLC) films have been explored extensively in the past due to their highly attractive properties. However, the high level of internal stress developed during growth prevents deposition of thick films. Synthesis of DLC/DLC multilayers (DDM) presents a venue to overcome this drawback. In the present study, DLC films and DDM were deposited on Si substrate using dc plasma of CH4 and Ar gas mixture. FTIR was used to analyze the structure of the DLC films. Mechanical properties of the films were characterized by microhardness testing and nanoindentation. The tribological properties were studied by conducting pin-on-disc experiments in …
Freeway Accident Analysis Using Second Order Statistics, Khasim Khasimul Shaik
Freeway Accident Analysis Using Second Order Statistics, Khasim Khasimul Shaik
LSU Master's Theses
This research focuses on the use of historical freeway traffic data for comparison of the precursory traffic conditions to that accident occurrence by using 15-minute traffic speed contour maps. The second order statistics measures, namely angular second moment (ASM), contrast and entropy were used as the traffic performance measures in order to compare the two situations. The data used is from I-4 freeway traffic condition database, stored in a SQL server and 1999 year accident database for the same I-4 freeway. The study section is located in Orlando, Florida. The approach shows an approach to understand the performance of the …