The Correlation of Stress-State and Nano-Mechanical Properties in Au

Abstract

A high-speed data link that would provide dramatically faster communication ffom downhole instruments to the surface and back again has the potential to revolutionize deep drilling for geothermal resources through Diagnostics-While-Drilling (DWD).Many aspects of the drilling process would significantly improve if downhole and surface data were acquired and processed in real-time at the surface, and used to guide the drilling operation. Such a closed-loop, driller-in#e-loop DWD system, would complete the loop between information and control, and greatly improve the performance of drilling systems.The main focus of tlis program is to demonstrate the value of real-time data for improving drilling. While high-rate transfer of down-hole data to the surface has been accomplished before, insufficient emphasis has been placed on utilization of the data to tune the drilling process to demonstrate the true merit of the concept. Consequently, there has been a lack of incentive on the part of industry to develop a simple, lowcost, effective high-speed data link.Demonstration of the benefits of DWD based on a high-speed data link will convince the drilling industry and stimulate the flow of private resources into the development of an economical high-speed data link for geothermal drilling applications. Such a downhole communication system would then make possible the development of surface data acquisition and expert systems that would greatly enhance drilling operations. Further, it would foster the development of downhole equipment that could be controlled from the surface to improve hole traj ectory and drilling performance.

Incipient yielding behavior during indentation for gold thin films before and after annealing

“…Third, consider also that a tensile residual stress exists within the gold film, which is greatly enhanced by the annealing process. 25 Analysis in the literature suggests the presence of tensile stress in a thin film specimen will reduce its hardness and modulus, 53 counteracting the first two effects. Lastly, the anisotropic nature of the thin films may influence the modulus measurements.…”