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  • thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
  • IOS Press  (2)
  • Logos Verlag Berlin  (1)
  • 2020-2024  (3)
  • 1940-1944
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  • 2020-2024  (3)
  • 1940-1944
Year
  • 1
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    Unknown
    IOS Press
    Publication Date: 2024-04-11
    Description: Sand, clay and rock have to be excavated for a variety of purposes, such as dredging, trenching, mining (including deep sea mining), drilling, tunnel boring and many other applications. Many excavations take place on dry land, but they are also frequently required in completely saturated conditions, and the methods necessary to accomplish them consequently vary widely. This book provides an overview of cutting theories. It begins with a generic model, valid for all types of soil (sand, clay and rock), and continues with the specifics of dry sand, water-saturated sand, clay, atmospheric rock and hyperbaric rock. Small blade angles and large blade angles are discussed for each soil type, and for each case considered the equations/model for cutting forces, power and specific energy are given. With models verified by laboratory research, principally from the Delft University of Technology, and data from other recognized sources, this book will prove an invaluable reference for anybody whose work involves major excavations of any kind.
    Keywords: TA1-2040 ; rock ; sand ; excavations ; clay ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
    Language: English
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  • 2
    facet.materialart.
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    IOS Press
    Publication Date: 2024-04-11
    Description: The biggest problem for a shallow foundation, just as for any other type of foundation, is a failure due to an overestimation of the bearing capacity. This means that the correct prediction of the bearing capacity of the foundation is often the most important part of the design of a civil structure. That is why the publication by Prandtl in 1920 about the hardness of a plastic body, was a major step in solving the bearing capacity of shallow foundations, although it is well possible that he never realised this, because his solution was not made for civil engineering purposes, but for mechanical purposes. Over the last 100 years, a lot of extensions have been made, for example with inclination factors and shape factors. Also many laboratory experiments have been done and numerical calculations have been made. Some even try to extrapolate the failure mechanism for shallow foundations to the failure mechanism around the tip of a pile. All this scientific work leads back to the first publication by Ludwig Prandtl in 1920. This book, “100 Years of Prandtl’s Wedge”, is intended for all those who are interested in these fundamentals of foundation engineering and their history. The Appendices include a copy of Prandtl’s Über die Härte plastischer Körper and of Reissner’s publication of 1924, Zum Erddruckproblem.
    Keywords: TA1-2040 ; shape factors ; bearing capacity ; civil ; Ludwig Prandtl ; foundation ; engineering ; structure ; inclination factors ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
    Language: English
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  • 3
    Publication Date: 2024-03-30
    Description: Über 50 % der deutschen Werkzeugmaschinen werden heute in Baden-Württemberg hergestellt. Einen wesentlichen Anteil an diesem Erfolg haben die NC-Maschinen. Die ersten aus Baden-Württemberg wurden 1959 von den Firmen Gebr. Heller aus Nürtingen und Burkhardt & Weber aus Reutlingen vorgestellt, die damit Entwicklungen aus den USA aufgriffen. Das vorliegende Buch versucht, die wesentlichen Gründe für diese Erfolgsgeschichte herauszuarbeiten. Es wird untersucht, wie sich die NC-Einführung bei fünf baden-württembergischen Werkzeugmaschinenherstellern vollzog, warum zwei Großkonzerne und ein Druckmaschinenhersteller ihre Fertigung mit deutlich unterschiedlicher Geschwindigkeit auf NC-Maschinen umstellten und welche Faktoren für die unterschiedlichen Verläufe ausschlaggebend waren. Dazu werden die technischen Randbedingungen wie die Entwicklung der Rechner-, Antriebs- und Automatisierungstechnik beleuchtet, die die Wirtschaftlichkeit der NC-Maschinen kontinuierlich verbessert haben. Besonderes Augenmerk wird auf die Zusammenarbeit von Werkzeugmaschinenherstellern, produzierenden Unternehmen, Hochschulen, Gewerkschaften, Verbänden und staatlicher Forschungsförderung im produktionstechnischen Innovationssystem gelegt, da diese die technologische Leistungsfähigkeit der westdeutschen Werkzeugmaschinenhersteller maßgeblich prägte. Da die Quellenlage zum Teil erhebliche Lücken aufwies, wurden diese durch zahlreiche Gespräche und Interviews mit Zeitzeugen aus Forschung und Industrie geschlossen.
    Keywords: Numerisch gesteuerte Werkzeugmaschinen (NC-Maschinen) ; Fertigungstechnik ; Technikgeschichte ; Automatisierungstechnik ; NC-Steuerungen ; thema EDItEUR::K Economics, Finance, Business and Management::KJ Business and Management::KJD Business innovation ; thema EDItEUR::K Economics, Finance, Business and Management::KN Industry and industrial studies::KNX Industrial relations, occupational health and safety ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGB Mechanical engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGP Production and industrial engineering ; thema EDItEUR::U Computing and Information Technology::UB Information technology: general topics
    Language: German
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