Open Access. Powered by Scholars. Published by Universities.®

Applied Mechanics Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 4 of 4

Full-Text Articles in Applied Mechanics

A Numerical Approach To Model And Predict The Energy Absorption And Crush Mechanics Within A Long-Fiber Composite Crush Tube , Leon Pickett Jr. Jan 2005

A Numerical Approach To Model And Predict The Energy Absorption And Crush Mechanics Within A Long-Fiber Composite Crush Tube , Leon Pickett Jr.

Retrospective Theses and Dissertations

Past research has conclusively shown that long fiber structural composites possess superior specific energy absorption characteristics as compared to steel and aluminum structures. However, destructive physical testing of composites is very costly and time consuming. As a result, numerical solutions are desirable as an alternative to experimental testing. Up until this point, very little numerical work has been successful in predicting the energy absorption of composite crush structures. This research investigates the ability to use commercially available numerical modeling tools to approximate the energy absorption capability of long-fiber composite crush tubes. This study is significant because it provides a preliminary ...


Fatigue Life Investigation Of Solid And Hollow Rollers In Pure Rolling Contact , Wisam M. Abu Jadayil Jan 2005

Fatigue Life Investigation Of Solid And Hollow Rollers In Pure Rolling Contact , Wisam M. Abu Jadayil

Retrospective Theses and Dissertations

Solid and hollow cylindrical rollers in pure rolling contact have been modeled using the finite element package, ABAQUS, to study the stress distribution and the resulting deformations in the rollers' bodies when the two rollers are subjected to a pure normal loading or to a combined normal and tangential loading. The tangential loading is one third of the normal loading value. Then the Ioannides-Harris fatigue life model for rolling bearings has been applied on the ABAQUS numerical results to investigate the fatigue life of the solid and hollow rollers. Using the fatigue life of the solid rollers as the reference ...


Synergy Between Chemical Dissolution And Mechanical Abrasion During Chemical Mechanical Polishing Of Copper , Wei Che Jan 2005

Synergy Between Chemical Dissolution And Mechanical Abrasion During Chemical Mechanical Polishing Of Copper , Wei Che

Retrospective Theses and Dissertations

Chemical mechanical planarization (CMP) is a mainstream semiconductor processing method for achieving local and global wafer planarization. However, the CMP process fundamentals are poorly understood, and thereby inhibit migratability of lab-scale experiments to production processes. This work addresses the synergistic role of chemical dissolution rate (CDR) and mechanical abrasion rate (MAR) on the material removal mechanisms during CMP process.;A set of nano-wear experiments on elecro-plated copper surfaces are conducted with systematic exposure to active slurry. Initial results of in situ wear test in chemically active slurry showed an increased material removal rate (MRR) relative to a dry wear test ...


Comparison Of A Solvent-Free Tar Quantification Method To The International Energy Agency’S Tar Measurement Protocol, Ming Xu, Robert C. Brown, Glenn A. Norton, Jerod Smeenk Jan 2005

Comparison Of A Solvent-Free Tar Quantification Method To The International Energy Agency’S Tar Measurement Protocol, Ming Xu, Robert C. Brown, Glenn A. Norton, Jerod Smeenk

Mechanical Engineering Publications

This paper presents a new method for measuring tar concentration in biomass-derived producer gas streams. This solvent-free method is much simpler than the evaporative method of the International Energy Agency (IEA) tar protocol. In tests on producer gas from a fluidized bed biomass gasifier this so-called dry condenser method yielded tar measurements with precision better than 5% and accuracy averaging to within 10% of the IEA tar protocol. Comparisons of water vapor concentrations in producer gas as determined by the two methodologies showed poor agreement, which appears to be due to the low precision of both techniques for this measurement ...