Constitutive modeling of superalloy single crystals with verification testing

The goal is the development of constitutive equations to describe the elevated temperature stress-strain behavior of single crystal turbine blade alloys. The program includes both the development of a suitable model and verification of the model through elevated temperature-torsion testing. A constitutive model is derived from postulated constitutive behavior on individual crystallographic slip systems. The behavior of the entire single crystal is then arrived at by summing up the slip on all the operative crystallographic slip systems. This type of formulation has a number of important advantages, including the prediction orientation dependence and the ability to directly represent the constitutive behavior in terms which metallurgists use in describing the micromechanisms. Here, the model is briefly described, followed by the experimental set-up and some experimental findings to date

Constitutive modelling of single crystal and directionally solidified superalloys

Successful attempts were made to model the deformation behavior of nickel base superalloys to be used in gas turbine engines based on both a macroscopic constitutive model and a micromechanical formulation based on crystallographic slip theory. These models were programmed as FORTRAN subroutines, are currently being used to simulate thermomechanical loading predictions expected at the fatigue critical locations on a single crystal turbine blade. Such analyses form a natural precursor to the application of life prediction methods to gas turbine airfoils

Film Stills

Film cinematography has always fascinated me, particularly the way composition, color, and lighting augment the subject\u27s mood and can evoke an emotion out of viewers. I want to emulate this in my portraits, with the goal of transporting the viewers into another world

Noise suppression in inverse weak value based phase detection

We examine the effect of different sources of technical noise on inverse weak value-based precision phase measurements. We find that this type of measurement is similarly robust to technical noise as related experiments in the weak value regime. In particular, the measurements considered here are robust to additive Gaussian white noise and angular jitter noise commonly encountered in optical experiments. Additionally, we show the same techniques used for precision phase measurement can be used with the same technical advantages for optical frequency measurements.Comment: 6 pages, 4 figure

MS

thesisHypochondriasis is a complex disorder that has considerable impact on healthcare utilization and costs. Recent conceptualizations of hypochondriasis posit that it is a multicomponent construct, which varies along a continuum of severity. Cognitivebehavioral theory is the predominant conceptualization of hypochondriasis, but recent theoretical developments posit important interpersonal factors in the development and maintenance of the disorder resulting in an interpersonal model of hypochondriasis. The purpose of the current study was to replicate and extend the interpersonal model. One hundred twenty-two undergraduate students were asked to complete selfreport measures assessing demographic information, hypochondriacal tendencies, interpersonal traits and problems, interpersonal correlates, attachment, and personality. The multicomponent aspect of hypochondriasis was confirmed in which distinct patterns of correlations emerged among the various components and interpersonal correlates. The conviction component of hypochondriasis-the belief that one is really sick along with the frustration that others do not recognize this-was associated with the predicted hostile-submissive interpersonal style. Hypochondriacal tendencies were also associated with insecure, anxious attachment, interpersonal problems, increased loneliness and interpersonal stress, and decreased social support. The findings indicate that the interpersonal model of hypochondriasis might be refined by considering its multiple components, particularly the conviction component

Petroleum Transport System: No Longer a Legitimate Target

The names Argo Merchant, Amoco Cadiz and, most recently, Exxon Valdez evoke none of the nostalgic fascination often associated with the wreck of great ships