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Fatigue Crack Growth Of Nps20 Steel Oil Pipe At Varied Orientations, Craig G. L. Taylor

Electronic Theses and Dissertations

Very few studies concerning fatigue of oil pipe have been conducted using full-scale tests. Further, no research is found in open literature concerning fatigue cracks in the longitudinal direction of pipes, despite being deemed more critical. Fatigue crack growth was investigated in NPS 20, API 5L X-70 grade, straight-seam steel oil pipes in the base metal and at the welded joint for various orientations. Specifically, the effect of the welded joint and crack orientation on the fatigue crack growth behaviour relative to a longitudinal crack in the base metal was determined. The fatigue crack growth behaviour of a longitudinal crack …

New Materials And Methods For The Fabrication Of Large-Area Stretchable Electronics, Heather Lynn Filiatrault,

Electronic Theses and Dissertations

This dissertation addresses three main challenges towards the fabrication of large-area stretchable electronic devices. First, we replaced expensive photolithography techniques with low-cost methods to achieve highly stretchable gold films on elastomers. Second, we enabled the fabrication of large-area stretchable pixels through the incorporation of stretchable elastomers in the emissive layer of light-emitting devices. Third, we made progress towards theinception of air-stable large-area stretchable electronics by developing methods to deposit conductive metal films on new highly impermeable stretchablesubstrates.

Chapter 2 describes the deposition of a low-cost, microstructured glue interlayer on an elastomeric substrate to enable the fabrication of gold films with …