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Full-Text Articles in Engineering
Science For Stewardship: Multidisciplinary Research On Uss Arizona, Matthew A. Russell, Larry E. Murphy, Donald L. Johnson, Timothy J. Foecke, Pamela J. Morris, Raphy Mitchell
Science For Stewardship: Multidisciplinary Research On Uss Arizona, Matthew A. Russell, Larry E. Murphy, Donald L. Johnson, Timothy J. Foecke, Pamela J. Morris, Raphy Mitchell
Department of Mechanical and Materials Engineering: Faculty Publications
The National Park Service’s Submerged Resources Center and USS Arizona Memorial are conducting and coordinating research directed at understanding the nature and rate of natural processes affecting the deterioration of the USS Arizona in Pearl Harbor, Hawaii. The USS Arizona Preservation Project is designed to be multi-year, interdisciplinary and cumulative, with each element contributing to developing an overall management strategy designed to minimize environmental hazard from fuel oil release and provide the basic research required to make informed management decisions for long-term preservation. The primary project focus is toward acquiring requisite data for understanding the complex corrosion and deterioration processes …
The Effect Of Heterogeneity On Plane Wave Propagation Through Layered Composites, X. Chen, Namas Chandra
The Effect Of Heterogeneity On Plane Wave Propagation Through Layered Composites, X. Chen, Namas Chandra
Department of Mechanical and Materials Engineering: Faculty Publications
When laminated composites are subjected to impact loading, the material response is critically determined by the interactions of multiple waves generated at the laminate interfaces. Due to the high complexity arising from the architectural details of composites, layered heterogeneous materials have been studied as the model system to understand the impact behavior of engineering composites. Previously, the present authors have developed an analytical solution to the problem of plate impact of layered systems; plate impact test is a standard boundary value problem used to study high velocity impact behavior both in the elastic and shock wave regimes. In this paper, …
Re-Examination Of “Missing Strain” During Superplastic Deformation Of Aa7475, M. J. Tan, C. L. Chen, Namas Chandra
Re-Examination Of “Missing Strain” During Superplastic Deformation Of Aa7475, M. J. Tan, C. L. Chen, Namas Chandra
Department of Mechanical and Materials Engineering: Faculty Publications
“Missing strain,” a discrepancy between the total macroscopic strain and the strain contributed by grain boundary sliding (GBS) during superplastic deformation, appears to exist in previous investigations. In this work, the contri¬bution of GBS (ξGBS) and intragranular strain (ξIG) were simultaneously measured using scratch test conducted on AA7475 samples after deformation at 500 °C at initial strain rate of 10-3 s-1. The result shows that the missing strain results most probably from the neglect of the intragranular strain as well as the anisotropic GBS-induced underesti¬mation of ξGBS. The calculation of ξ …
Bar Clamp Having Ergonomic Handle, M. Susan Hallbeck, Myung-Chul Jung
Bar Clamp Having Ergonomic Handle, M. Susan Hallbeck, Myung-Chul Jung
Department of Mechanical and Materials Engineering: Faculty Publications
The present invention generally relates to a handle assembly for a hand operable bar clamp having a fixed jaw, a movable jaw and a drive for translating the movable jaw towards the fixed jaw. The assembly includes a handgrip and a trigger handle. The handgrip having an elongated rear portion has a generally rounded surface and being contoured to complement the natural transverse curve pf a human palm. The trigger handle is pivotal with respect to the handgrip. The trigger handle included an elongated front portion having a rounded front surface and being contoured to complement the natural palmer curve …
Planetary Cliff Descent Using Cooperative Robots, Erik Mumm, Shane Farritor, Paola Pirjanian, Chris Leger, Paul Schenker
Planetary Cliff Descent Using Cooperative Robots, Erik Mumm, Shane Farritor, Paola Pirjanian, Chris Leger, Paul Schenker
Department of Mechanical and Materials Engineering: Faculty Publications
Future robotic planetary exploration will need to traverse geographically diverse and challenging terrain. Cliffs, ravines, and fissures are of great scientific interest because they may contain important data regarding past water flow and past life.
Highly sloped terrain is difficult and often impossible to safely navigate using a single robot. This paper describes a control system for a team of three robots that access cliff walls at inclines up to 70°. Two robot assistants, or anchors, lower a third robot, called the rappeller, down the cliff using tethers. The anchors use actively controlled winches to first assist the rappeller in …
A Helical Tow Model And Numerical Simulation Of On-Line Thermal Curing Of Thermoset Composites In Filament Winding, Xuefeng Wang, David Y.S. Lou, Negli Zhang`
A Helical Tow Model And Numerical Simulation Of On-Line Thermal Curing Of Thermoset Composites In Filament Winding, Xuefeng Wang, David Y.S. Lou, Negli Zhang`
Department of Mechanical and Materials Engineering: Faculty Publications
A helical tow model of on-line curing of thermoset composites in winding is developed and solved numerically. Actual shape of tow in winding process is considered, and consequently, the modeling of the on-line curing process is more realistic. A numerical grid generation method is developed for the complicated geometry. Transformations of three-dimensional energy equation and its boundary conditions from physical domain to computational domain are performed, which are crucial in numerical grid generation method when an anisotropic medium is involved. A set of concise and regular equations is obtained. The numerical simulation results show that the helical tow model, in …
Computer Programs For Temperature In Fins And Slab Bodies With The Method Of Green’S Functions, Kevin D. Cole
Computer Programs For Temperature In Fins And Slab Bodies With The Method Of Green’S Functions, Kevin D. Cole
Department of Mechanical and Materials Engineering: Faculty Publications
Heat conduction in fins and slab bodies, a traditional undergraduate topic, is treated with the Green’s function (GF) method. A variety of boundary conditions and heating conditions are included. Computer programs are described which are designed to improve student learning of the GF method. The programs are available from the author.