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In order to comparatively assess near-neutral pH stress corrosion cracking (NNpH-SCC) resistance of pipeline steels with different strength, constant load tests in NS4 solution purged with 5%CO2-N2 gas mixture were conducted on American Petroleum Institute (API) grade X70, X80 and X100 pipeline steels. Experimental results show that pit cracks appeared on the surface of X70 steel and non-pit cracks appeared on X100 steel. However, for X80 steel both pit cracks and non-pit cracks were observed, but pit cracks dominated. The near-neutral pH SCC resistance decreased in the order of X70, X100 and X80 at the same applied stress level. [ABSTRACT FROM AUTHOR]

Investigates the development of experimental and analytical techniques to understand high-cycle fatigue behavior of steel wires. Use of ultrasonic fatigue test; Fatigue strength of the steel wires; Crack initiation and propagation behavior.

Investigates the long fatigue life of ferrous alloys. Occurrence of fatigue failure; Relationship between temperature and stress amplitudes; Observations of fracture surfaces.

A novel short waveguide terminal load (patent pending) with broad bandwidth is proposed and demonstrated. A simple design procedure is developed for the proposed terminal load. For verification purposes, a terminal load over the frequency range from 6.57 to 9.99 GHz was designed, manufactured and measured. The simulated results are compared with the measured data, and good agreement is reported. The measured return loss is greater than 20 dB over the full waveguide operating band (R84 standard waveguide), its total length is less than 35 mm, which is about a half of a commercial load with the same performance. [ABSTRACT FROM AUTHOR]