The purpose of this study was threefold: (1) to determine the degree of pupil failure as it exists in the Senior High School, Stamford, Texas; (2) to consider the extent to which the "basic factors" of failure contribute to pupil failure in this school; and (3) to submit suggestions as to how pupil failure may be reduced to a minimum in the Stamford Senior High School.

Laminated composite structures have started to play a very significant role in today's aircraft industry. The application of composite materials has now gone beyond the borders of aircraft design and has entered into such fields as automotive, athletics and recreational equipment, etc. The light weight and high specific strength of composite material helps design vehicles with higher fuel efficiency and longevity. In order to understand the influence of design parameters related to the use of composite materials in these applications, a proper study of the laminated composite structures requires a complete failure analysis, which includes both initiation and propagation of damage. In this work a progressive failure methodology is developed and implemented in the commercial Finite Element software package, Abaqus. Out of the numerous failure criteria available in the literature to study damage initiation and propagation in unidirectional fiber reinforced composites, Puck and Schurmann's failure criteria have been chosen due to their ability to predict results close to those observed experimentally. Key features of the Puck and Schurmann's failure criteria for three-dimensional deformations of unidirectional fiber reinforced composites have been summarized. Failure modes in the matrix and the fiber are considered separately. The failure criteria are simplified for plane stress deformations. Whereas the failure plane can be analytically identified for plane stress deformations, a numerical search algorithm is needed for three-dimensional problems. Subsequent to the initiation of matrix failure, elastic moduli are degraded and values of these degradation parameters and fracture plane angles are found by using a Continuum Damage Mechanics (CDM) approach. It is found that the assumption that the material response remains transversely isotropic even after the matrix failure has initiated requires the degradation of the transverse Poisson's ratio. The Puck and Schurmann's failure criteria and the material degradation process have been implemented as a User Defined Field (USDFLD) subroutine in Abaqus. The implementation has been verified by analytically computing results for simple loadings and comparing them with predictions from using the USDFLD in Abaqus. Subsequently, both two- and three-dimensional problems of more realistic geometries and loadings have been analyzed and computed results compared with either experimental findings or results available in the literature. Major contributions of the work include identifying the degradation parameter for the transverse Poisson's ratio in terms of the matrix degradation parameter for the matrix failure in compression, development of the USDFLD based on Puck and Schurmann's failure criteria, implementing the USDFLD in the commercial finite element software, Abaqus, and verifying that results computing using the USDFLD for various laminates and loadings agree with those from either the analytical solution of the problem or those available in the literature. / Ph. D.

No description available.

ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada / Current equipment and vehicle failure analysis practices use diagnostic technology developed over the past 100 years of designing and manufacturing electrical and mechanical equipment to identify root cause of equipment failure requiring expertise with the equipment under analysis. If the equipment that failed had telemetry embedded, prognostic algorithms can be used to identify the deterministic behavior in completely normal appearing data from fully functional equipment used for identifying which equipment will fail within 1 year of use, can also identify when the presence of deterministic behavior was initiated for any equipment failure.

ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada / Current failure analysis practices use diagnostic technology developed over the past 100 years of designing and manufacturing electrical and mechanical equipment to identify root cause of equipment failure requiring expertise with the equipment under analysis. If the equipment that failed had telemetry embedded, prognostic algorithms can be used to identify the deterministic behavior in completely normal appearing data from fully functional equipment used for identifying which equipment will fail within 1 year of use, can also identify when the presence of deterministic behavior was initiated for any equipment failure.

published_or_final_version / Surgery / Doctoral / Doctor of Philosophy

published_or_final_version / Medical Sciences / Master / Master of Medical Sciences

published_or_final_version / Surgery / Doctoral / Doctor of Philosophy

Two studies were conducted to examine if and how failure can lead to subsequent psychological flourishing. Both studies used the context of individuals’ biggest job-related failure or most significant challenge to test a proposed model of adaptive response to failure. Specifically, it was proposed that, at a cognitive/emotional level, an adaptive response to failure is characterized by acceptance of negative emotions and self-acceptance. Further, it was proposed that at a behavioral level, an adaptive response to failure involves goal disengagement coupled with goal reengagement, including reengaging with new goals that are intrinsically meaningful. These complementary studies both examined the relationship between individuals’ response to failure and psychological flourishing. Studies were conducted with different participant samples and used complementary designs to provide converging evidence for the proposed model. Using a random sampling process to recruit participants, Study 1 (N = 50) consisted of semi-structured interviews with individuals from the Austin community. Study 2 (N = 101) was an online study and consisted of a series of questionnaires and a writing task. Analyses were conducted on interviews, questionnaires, and writings to examine the relationships between response to failure, including acceptance of negative emotions, self-acceptance, goal disengagement, and goal reengagement, and psychological flourishing. Overall, findings underscored the significance of acceptance and goal reengagement in predicting psychological flourishing after failure. Goal reengagement, in particular, consistently predicted subsequent flourishing. Results also indicated that in response to failure, both persistence toward meeting established goals and moving beyond established goals can lead to subsequent flourishing. These findings imply that flexibility, rather than adherence to a singular response, may be adaptive in responding at a behavioral level to failure. Furthermore, results showed that failures characterized by higher emotional distress can lead to greater subsequent psychological flourishing than failures characterized by low levels of emotional distress. Overall, both studies demonstrate that failure, when responded to in an adaptive way, can lead to a broad range of positive psychological outcomes. / text

No description available.