نتایج جستجو برای: mudstone accelerated creep
تعداد نتایج: 72635 فیلتر نتایج به سال:
The rheological properties of soft rocks should be considered in the long-term design and maintenance deep-buried tunnels using uniaxial single-stage loading graded incremental cyclic-loading methods. In this article, creep tests were performed on silty mudstone from a specific water conveyance tunnel China, with buried depth range 1650–2320 m subjected to high situ stress. curves under differe...
Title of Dissertation: CREEP CORROSION OVER PLASTIC ENCAPSULATED MICROCIRCUIT PACKAGES WITH NOBLE METAL PREPLATED LEADFRAMES Ping Zhao, Doctor of Philosophy, 2005 Dissertation Directed By: Dr. Michael Pecht, Professor, Department of Mechanical Engineering Field failures were observed to be caused by the bridging of corrosion products across lead fingers. This phenomenon was identified as creep ...
An integrated nomenclature scheme is proposed to capture the inherent heterogeneity of fine-grained sedimentary rocks at the 102 to 1023 mm scale and to assist the evaluation of these rocks as sinks of organic carbon, barriers to fluid flows, and reservoirs of oil and gas. This scheme incorporates previous knowledge and the latest field, petrographic, and laboratory observations. We propose to ...
The Pickett effect is the phenomenon of creep enhancement during transient drying. It has been observed for many nanoporous solids, including concrete, wood and Kevlar. While the existing micromechanical models can partially explain this effect, they have yet to consider nanoscale dynamic effects of water in nanopores, which are believed to be of paramount importance. Here, we examine how creep...
Mudstone subgrade may exhibit rather complicated deformation behavior under the coupling effect of unloading and wet swelling caused by excavation. To study mechanism mudstone subgrade, mudstones were sampled from NO.3 branch tunnel Badong section Zhengzhou-Wanzhou High-speed Railway a series wet-swelling tests carried out on them. We studied long-term excavation based creep test with condition...
INTRODUCTION: Previous testing of various collagen cross-linking agents showed potential to increase stiffness and failure behavior as well as reduce hysteresis and creep behavior in rat tail tendon fascicles [1]. Based on these results, we hypothesized that exogenous collagen cross-linking might be a candidate for reinforcing injured or healing tendons or to halt progression of tendon tears. T...
Directionally solidified (DS) Ni-base superalloys have become a commonly used material in gas turbine components. Controlled solidification during the material manufacturing process leads to a special alignment of the grain boundaries within the material. This alignment results in different material properties dependent on the orientation of the material. When used in gas turbine applications t...
Sedimentary rocks at Yellowknife Bay (Gale crater) on Mars include mudstone sampled by the Curiosity rover. The samples, John Klein and Cumberland, contain detrital basaltic minerals, calcium sulfates, iron oxide or hydroxides, iron sulfides, amorphous material, and trioctahedral smectites. The John Klein smectite has basal spacing of ~10 angstroms, indicating little interlayer hydration. The C...
The tension-tension fatigue behavior of ductile adhesively-bonded double-lap FRP joints was experimentally investigated. An acrylic adhesive, which in the rubbery state at ambient temperature, provided joint ductility. degradation characterized by cyclic energy dissipation, stiffness, creep displacement and self-generated temperature. effects elevated temperature on joints’ static tensile pure ...
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