Room temperature crack growth rates and -20 deg F fracture toughness of welded 1 1/4 inch A-285 steel plate

Data are presented which were developed in support of a structural assessment of NASA-LEWIS' 10-foot by 10-foot supersonic wind tunnel, critical portions of which are fabricated from rolled and welded 1 1/4 inch thick A-285 steel plate. Test material was flame cut from the tunnel wall and included longitudinal and circumferential weld joints. Parent metal, welds, and weld heat affected zone were tested. Tensile strength and fracture toughness were determined at -20 F, the estimated lowest tunnel operating temperature. Crack growth rates were measured at room temperature, where growth rates in service are expected to be highest

The effect of microstructure on the fracture toughness of titanium alloys

The microstructure of the alpha titanium alloy Ti-5Al-2.5Sn and the metastable beta titanium alloy Beta 3 was examined. The material was from normal and extra low interstitial grade plates which were either air-cooled or furnace-cooled from an annealing treatment. Beta 3 was studied in alpha-aged and omega-aged plates which were heat treated to similar strength levels. Tensile and plane strain fracture toughness tests were conducted at room temperature on the alpha-aged material. The microstructure and fracture mechanisms of alloys were studied using optical metallography, electron microscopy, microprobe analyses, and texture pole figures. Future experiments are described

Specimen size and geometry effects on fracture toughness of Al2O3 measured with short rod and short bar chevron-notch specimens

Plane strain fracture toughness measurements were made on Al2O3 using short rod and short bar chevron notch specimens previously calibrated by the authors for their dimensionless stress intensity factor coefficients. The measured toughness varied systematically with variations in specimen size, proportions, and chevron notch angle apparently due to their influence on the amount of crack extension to maximum load (the measurement point). The toughness variations are explained in terms of a suspected rising R curve for the material tested, along with a discussion of an unavoidable imprecision in the calculation of K sub Ic for materials with rising R curves when tested with chevron notch specimens

The Truth About Lying: Does a Lie Cause Ego Depletion?

Ego depletion is defined as the loss of self-control resulting from prior acts of self-control. Several tasks cause ego depletion, including effortful cognitive tasks. I proposed that lying would create ego depletion due to the cognitive control associated with telling a lie. I further anticipated that the potential embarrassment associated with getting caught in a lie would cause additional ego depletion among participants. In the proposed study, we asked participants to lie to a confederate and either gave them the impression they would be caught in the lie or gave them a clear indication that they would not be caught in the lie. A control group was not asked to lie. I anticipated that ego depletion would be demonstrated among those asked to lie by failing to persist on a computer task relative to participants who were not asked to lie. In addition, of those asked to lie, I expected more ego depletion to result from the expectation of being caught telling a lie relative to the condition in which participants were led to believe they would not be caught. Finally, I assessed trait honesty as a potential covariate in this study. Results showed that those people who lied completed significantly fewer computer trials than those who did not lie, indicating ego depletion relative to the control condition. The act of creating a lie requires an individual to engage in cognitive effort, such as memory, improvisation, and creative thinking, and cognitive energy has been tied to deficits in self-control (i.e., ego depletion). Lack of a difference between the two lie conditions may indicate that the lie itself was highly distressing, and the added burden of being caught lying was not sufficient to overcome the ceiling effect that already existed. As an alternative explanation, all participants may have assumed they would be caught in the lie when they encountered the other student on campus after the study

A Therapeutic Pastoral Counseling Program Designed to Reveal and Treat Combat Events of Homeless Veterans in Wake County, North Carolina

This thesis project researched homelessness among male veterans in Wake County, North Carolina to determine if they experienced a combat event that caused spiritual injury caused by moral injury and shame, which contributed to their homelessness. Joshua’s Conquest, the spiritual formation treatment program is used to treat the spiritual injury. The need for this program is explicated, along with the development of Joshua’s Conquest, and how it will treat this odious event, so the homeless male veteran will be able to obtain housing normalcy. Personally, this thesis project was fueled by experiences with homelessness and limited service in the military. The supportive research data for this thesis project was collected from interviews with homeless male veterans in Wake County, North Carolina. The potential value of this thesis project is a nationally treat homeless veterans that bravely served this great nation, so that they may acquire housing normalcy