Download or read book A Microscopic Submicroscopic and Microseismic Analysis of Stable Crack Propagation and the Effect of Chemical Environment on Stable Crack Propagation in Synthetic Quartz written by Jeremy David Dunning and published by . This book was released on 1978 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1979 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1979 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1978 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1980 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Chemical Environments on Subcritical Crack Growth in Geological Materials written by Raushan Kumar and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Subcritical crack propagation experiments were performed using the double torsion test methodology on sandstone and granite samples. The control environments consisted of air, water, aqueous cationic surfactant solutions and aqueous caustic solutions of high pH. The expected reduction in fracture toughness and subcritical index going from air to water environments was observed, a result of water being a more reactive environment. The reduction in subcritical index correlated strongly with the clay content of the sandstones, but no other mineralogic parameters seemed to affect fracture results significantly. Caustic solutions reduced strength and subcritical index more than did water, but surfactant solutions performed approximately the same as water, even though they were expected to be more reactive. Activation volume values were estimated from velocity versus stress intensity factor curves using published values of crack-tip radius of curvature, giving results on the order of 15.0 x 10−7 m3/mol for sandstone tested in air, about 5 times higher than previously reported values for quartz. The values dropped about 50% when measured in aqueous environments. A systematic study of variability in subcritical index values in air showed that subcritical index correlated inversely with the load drop observed during crack propagation. Subcritical indices decreased as load drop increased, with stable values usually resulting at load drops of 0.5 lbs or more for the 1.5 mm thick test samples. Tests performed in more reactive environments (i.e., aqueous solutions) typically resulted in higher load drops and less variable subcritical indices. High rate data acquisition techniques were implemented to try to capture crack propagation results beyond the stage I power-law velocity versus stress intensity factor behavior. The stage II constant velocity regime was observed, but only in one sample tested in air. Fracture roughness of experimentally created crack paths was also analyzed using fractal analysis. The degree of crack path tortuosity (actual rough path length divided by straight-line length, a measure of roughness) was clearly dependent on the scale at which it was measured. Using the modified divider technique, crack-path tortuosity exhibited a clear fractal nature, with results for sandstone, shale and limestone exhibiting fractal dimensions from D[approximately equal to]1.04 to D[approximately equal to]1.09. The fractal dimension indicated a negative.
Download or read book Stochastic Crack Propagation written by Giora Maymon and published by Academic Press. This book was released on 2018-01-02 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stochastic Crack Propagation: Essential Practical Aspects describes a feature important to the analysis of stochastic crack propagation, starting with essential background theory. Processes, or phenomena, which are of practical importance in the work of design engineers or R&D teams are described chapter by chapter. Many examples are described and supported by listed references, and files of data that can be used with specialist software to practice design situations are included. Advice on how to use various computer programs to design and predict for stochastic crack growth is also provided, giving professionals a complete guide. Presents instructions and exercises in the ideal format for professionals, focusing on applications Explains a methodology on how to optimize the engineering design process by including stochastic crack growth behavior Provides computational files to help readers get up-to-speed with design using programs like ANSYS and NASTRAN for stochastic crack growth
Download or read book A Kinetic Model of the Evolution of Cracks written by Zbigniew Czechowski and published by . This book was released on 1994 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three dimensional Analysis of Crack Growth written by Yaoming Mi and published by Computational Mechanics. This book was released on 1996 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The engineering applications presented in this text concentrate on the simulation and analysis of general mixed mode crack growth in three dimensions.
Download or read book Model Analysis of Stable Crack Growth written by Earl David Reedy and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rock Engineering written by Arild Palmstrom and published by ICE Publishing. This book was released on 2014-12-19 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock Engineering is a valuable reference tool for geotechnical engineers, geologists, consultants, contractors, and advanced students on rock engineering and engineering geology courses.
Download or read book Underground Excavations in Rock written by E.T. Brown and published by CRC Press. This book was released on 1980-06-30 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underground Excavations in Rock deals with the geotechnical aspects of the design of underground openings for mining and civil engineering processes.
Download or read book Nisyros Volcano written by Volker Jörg Dietrich and published by Springer. This book was released on 2017-08-22 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the first compilation of scientific research on the island of Nisyros, involving various geoscientific disciplines. Presenting a wealth of illustrations and maps, including a geological map of the volcano, it also provides valuable insights into the geothermal potential of Greece. The island of Nisyros is a Quaternary volcano located at the easternmost end of the South Aegean Volcanic Arc. The island is nearly circular, with an average diameter of 8 km, and covers an area of approximately 42 km2. It lies above a base of Mesozoic limestone and a thin crust, with the mantle-crust transition located at a depth of approximately 27 km. The volcanic edifice of Nisyros comprises a succession of calc-alkaline lavas and pyroclastic rocks, as well as a summit caldera with an average diameter of 4 km. Nisyros marks the most recent volcano in the large prehistoric volcanic field between Kos-Yali-Strongyli-Pyrgousa-Pachia-Nisyros, where the largest eruption (“Kos Plateau Tuff”) in the history of the eastern Mediterranean devastated the Dodecanese islands 161,000 years ago. Although the last volcanic activity on Nisyros dates back at least 20,000 to 25,000 years, it encompasses an active hydrothermal system underneath the volcano with temperatures of roughly 100°C at the Lakki plain, the present-day caldera floor and 350°C at a depth of 1,550 m. A high level of seismic unrest, thermal waters and fumarolic gases bear testament to its continuous activity, which is due to a large volume of hot rocks and magma batches at greater depths, between 3,000 and 8,000 m. Violent hydrothermal eruptions accompanied by major earthquakes occurred in 1873 and 1888 and left behind large, “world-wide unique” explosion craters in the old caldera. Through diffuse soil degassing, the discharge of all hydrothermal craters in the Lakki plain releases 68 tons of hydrothermal-volcanic derived CO2 and 42 MW of thermal energy per day. This unique volcanic and hydrothermal environment is visited daily by hundreds of tourists.
Download or read book Assessment of Ore Deposit Settings Structures and Proximity Indicator Minerals in Geological Exploration written by Prakash R. Golani and published by Springer Nature. This book was released on 2021-01-23 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This well-illustrated book aims to enhance observations and understanding of structural features and proximity-indicator minerals, critical in exploration. The book provides a unique blending of different content on observational and critical aspects of data acquisition, geological, structural, tectonic set-up, mineral deposit types, geophysical framework, and proximity indicator minerals. Combining these topics led to a comprehensive understanding to facilitate mineral targeting and exploration in green- and brown-field terrains. Besides field photographs, the write-up is lavishly supplemented with relevant geological and geophysical maps, tables, and case stories in field geology, making it useful for a much larger section of the geoscientific community professional geologists and geophysicists, students, teachers, and also decision-makers in geo-surveys and exploration.
Download or read book Macro Engineering written by V. Badescu and published by Springer Science & Business Media. This book was released on 2007-05-27 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Macro-engineering involves the large-scale modification and manipulation of natural systems for the benefit of mankind. The primary goals of some Earth-based macroprojects described in this book are power production, land reclamation, food production, climate change, water, transport and coastal protection. Other Earth or space projects considered here have a more futuristic ring, but our present-day technical skill makes their realization possible.
Download or read book Greenhouse Gas Control Technologies written by B. Eliasson and published by Elsevier. This book was released on 1999-05-20 with total page 1225 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain 270 papers outlining ideas and contributions to the new scientific, technical and political discipline of Greenhouse Gas (GHG) Control. The contributions were presented at the 4th International Conference on Greenhouse Gas Control Technologies (GHGT-4). It was the largest gathering of experts active in this new and fast-developing field.GHGT-4 was different from its predecessors in that it included all greenhouse gases, not only CO2, and all issues which could contribute to the mitigation of the greenhouse problem - technical, economic and political. The main focus was on practical solutions and real demonstrations of mitigation technology being planned and implemented today. It also addressed ways to increase the efficiency of power production and utilisation, and looked at proposals to encourage the development of renewable energy sources.During the Opening Session, 10 keynote addresses were heard from prominent personalities in government, industry and academia. To tackle this very inter-disciplinary problem and to achieve acceptable solutions, it is essential for industry and government to initiate intense dialogue and cooperation. Conferences like this can provide the opportunity for a meeting of minds between engineers and politicians in the face of global challenge. The primary attributes of this global challenge are manifold: the problem is global and international; it is inter-disciplinary, both in substance and approach; it covers technical, political and economic issues and involves government, science, industry and academia; it is complex and non-linear; and it will take the efforts of all parties involved to solve the problem.These proceedings contain ideas for starting demonstration projects and for making better use of the power and flexibility of market measures. They also show it is a problem we can influence and that there is a wealth of ideas. The challenge now is to find the right partners to put these ideas into action.
