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Failure Mechanisms In Tribological Coatings And Energy Materials Subjected To Different Environments And Temperatures, Guanhong Sun
Failure Mechanisms In Tribological Coatings And Energy Materials Subjected To Different Environments And Temperatures, Guanhong Sun
Electronic Theses and Dissertations
The objective of this research is to develop advanced material characterization and mechanical testing methods for C-, Mo- based and ferrous tribological coatings to be used in lightweight engines, and manufacturing of lightweight materials. These new characterization methods are also applied to the investigation of damage processes in energy materials, namely to investigate degradation in C- based electrodes used in Li-ion batteries. Evaluations of the damage mechanisms in these materials under static and sliding contact stress conditions, as well as under different environments and temperatures encountered under the actual service conditions create several challenges. Accordingly, an in-situ mechanical testing set-up …
Fatigue Crack Growth In Steel Used In Oil And Gas Pipelines, Jorge Silva
Fatigue Crack Growth In Steel Used In Oil And Gas Pipelines, Jorge Silva
Electronic Theses and Dissertations
Oil and gas pipelines are subject to cyclic loads and can develop fatigue cracks. Particularly, pipes with longitudinal fatigue cracks are of utmost importance since they are associated with bursting. With this issue in mind a method to predict fatigue crack growth was sought out. Hence, the objective of the current study was to develop a model to conservatively estimate fatigue life of a full-scale pipe specimen with a longitudinal fatigue crack. Fracture mechanics concepts in conjunction with a statistical model and both experimental and numerical techniques were used to construct this model. Nine compact tension specimens, one full-scale pipe …
Crevassing And Calving Of Glacial Ice, James Patrick Kenneally
Crevassing And Calving Of Glacial Ice, James Patrick Kenneally
Electronic Theses and Dissertations
Calving of ice is a relatively new area of research in the still young field of glaciology. In the short time that calving has been studied, it has been mainly treated as an afterthought, with the predominant mode of thinking being that it will happen so to concern oneself with why is not important. Many studies dealt with observations of calving front positions over time vs. ice velocity in an attempt to quantify the calving rate as the difference between the two, while others have attempted to deduce some empirical relationship between calving rate and variables such as water depth …