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Full-Text Articles in Engineering
Tensile Deformation Of A Nickel-Base Alloy At Elevated Temperatures, Ajit K. Roy, Anand Venkatesh, Vikram Marthandam
Tensile Deformation Of A Nickel-Base Alloy At Elevated Temperatures, Ajit K. Roy, Anand Venkatesh, Vikram Marthandam
Mechanical Engineering Faculty Research
The results of tensile testing involving Waspaloy indicate that the failure strain was gradually reduced at temperatures ranging between ambient and 300 °C. Further, serrations were observed in the engineering stress versus strain diagrams in the temperature range of 300-600 °C. The reduced failure strain and the formation of serrations in these temperature regimes could be the result of dynamic strain aging of this alloy. The extent of work hardening due to plastic deformation was reduced at temperatures above 300 °C. A combination of ductile and intergranular brittle failures was seen at temperatures above 600 °C. γ′ was detected at …
On The Intrinsic Evolution Of Material Inhomogeneities, Marek Elźanowski, Marcelo Epstein
On The Intrinsic Evolution Of Material Inhomogeneities, Marek Elźanowski, Marcelo Epstein
Mathematics and Statistics Faculty Publications and Presentations
The evolution of a distribution of material inhomogeneities (defects, dislo-cations, etc.) is investigated. Adopting our recently developed model of the anelastic evolution law of a defective solid crystal body and using the classical methods of the theory of hyperbolic waves we analyze such phenomena as the long-term relaxation of defects and the dislocation pile-up.
Modification Of Position And Attitude Determination Of A Test Article Through Photogrammetry To Account For Structural Deformation, Sean A. Krolikowski
Modification Of Position And Attitude Determination Of A Test Article Through Photogrammetry To Account For Structural Deformation, Sean A. Krolikowski
Theses and Dissertations
This study improved the current method of position and attitude determination to account for structural deformation of the wind tunnel test article due to aerodynamic loading. To account for deformation, parabolic bending and linear twisting coefficients were added into the Levenberg-Marquardt multi-parameter solver. By accounting for deformation, the accuracy of position and attitude determination was greatly improved. This study also takes a qualitative look at the optimum number of wind tunnel cameras and model targets. Optimal configuration was found to be around 50 targets and 2 cameras offset by 90 degrees.