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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Analysis of the Competitive Strategies on Coated Steel Products in Taiwan ¢w Taking Sheng Yu Steel as the Example

Chang, wen-chu 29 July 2001 (has links)
Steel industry is the base of economic development. Its relevant industries are quite wide and it may drive the whole development of its upper/down streams, especially coated steel products with excellent character of corrosion resistance to lead the market requests from traditional construction industry to home appliance, automobiles, and further extending to information and electronic industries. The local capacity of galvanized steel products had been sharply one time increased in 2000. Problems of how to digest the products keenly exist and the local environment in coated industry faces to be re-organized. Meanwhile under the impact of Asian financial storm, suppliers of hot rolled coils had been altered from the originally three companies to the exclusive one monopolized by China Steel, after An Feng¡¦s bankruptcy and Yieh Loong¡¦s emergence by China Steel. In addition, due to being attracted by the excellent environments and offered conditions from the cross-strait, the corporations of upper/down streams have been moving out. Thus the rolling/coating manufacturers of middle steam locally are forced to face the problems of raw materials being monopolized, capacity excess and local customers moving out. The study takes Sheng Yu Steel Co., Ltd. as the example to research how the coating steel manufacturer using the resources in hand to make the appropriate strategies in view of the great change of steel industry. Facing the internal and external influences, local coating steel manufacturers have to make efforts together to breakthrough the current barriers and pursue the future developments. Government should also push hard on economic development and speed up public construction to stimulate the consumption and lead the growth of economic prosperity. The suggestions to the leader of steel industry, China Steel, --- being the only national integrated steel refinery, under the condition of exclusively monopolizing raw materials, China Steel should regard itself as the national steel mill and consider the rises or falls of the whole steel industry in Taiwan, in addition to pursue its own benefits, but also to consider the existing space and international competition for the down-steam customers, in order to avoid the customers¡¦ bankruptcies or moving out due to the poor operation surrounding. The suggestions to the steel industry and the studied company are ¡V 1. To control the supply sources of raw materials, to avoid being controlled by the only supplier. 2. To emerge or make alliance with the local dealers of the same line, to extend business scope and lower the competitive pressure. 3. To develop high-added value products and practical application of new products, to replace imported products. 4. To strengthen R&D, to promote the abilities of manufacture process and products application.
32

Analysis of distortion-induced fatigue cracking of a trapezoidal steel box girder bridge including retrofit investigation

Quigley, James R. January 2009 (has links)
Thesis (M.C.E.)--University of Delaware, 2009. / Principal faculty advisors: Michael J. Chajes and Harry W Shenton III, Dept. of Civil & Environmental Engineering. Includes bibliographical references.
33

The metallurgical phase transformations in ROQ-tuf AD690 due to the MMA welding process /

Daames, Sherwyn M. January 1900 (has links)
Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 2002. / Word processed copy. Summary in English. Includes bibliographical references (leaves 142-143). Also available online.
34

Bolted and screwed connections of thin sheet steels at elevated temperatures

Yan, Shu, 閆澍 January 2012 (has links)
The structural behaviour of single shear bolted connections, double shear bolted connections and single shear screwed connections of thin sheet steels at elevated temperatures has been investigated in this study. The current design rules on bolted and screwed connections of thin sheet steels for cold-formed steel structures are applicable for ambient temperature condition only. These design rules may not be applicable for elevated temperature conditions. Therefore, design guidelines should be prepared for bolted and screwed connections of cold-formed steel structures at elevated temperatures. A total of 30 tensile coupon tests were conducted to investigate the material deterioration of the thin sheet steels at elevated temperatures, and also to determine the critical temperatures for connection tests. A total of 510 tests on single shear bolted connections, double shear bolted connections and single shear screwed connections of thin sheet steels at elevated temperatures was performed in the temperature ranged from 22 to 900?C using both steady state and transient state test methods. The test results were compared with the predicted values calculated from the North American, Australian/New Zealand and European specifications for coldformed steel structures. In calculating the nominal strengths of the connections, the reduced material properties of the thin sheet steels were used due to the deterioration of material at elevated temperatures. It is shown that the design strengths predicted by these specifications are generally conservative at elevated temperatures. Finite element models for single shear bolted connections, double shear bolted connections and single shear screwed connections were developed and verified against the experimental results. Explicit dynamic analysis technique was used in the numerical analyses. Extensive parametric studies that included 490 finite element specimens were carried out using the verified finite element models to evaluate the bearing strengths of bolted connections as well as the tilting and bearing strengths of screwed connections of thin sheet steels at elevated temperatures. Design equations for bearing strengths of bolted connections as well as design equations for tilting and bearing strengths of screwed connections were proposed based on both the experimental and the numerical results in the temperature ranged from 22 to 900?C. The bearing strengths of bolted connections as well as the tilting and bearing strengths of screwed connections obtained from the test specimens and the finite element analyses were compared with the predicted strengths calculated using the proposed design equations and also compared with the design strengths calculated using the current North American, Australian/New Zealand and European specifications with consideration of the reduced material properties at elevated temperatures. It is shown that the proposed design equations are generally more accurate and reliable in predicting the bearing strengths of bolted connections as well as the tilting and bearing strengths of screwed connections of thin sheet steels at elevated temperatures than the current design rules. The reliability of the current and proposed design rules was evaluated using reliability analysis. The proposed design equations are suitable for bolted and screwed connections assembled using thin sheet steels of thickness ranged from 0.35 to 3.20mm. / published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
35

Direct tension fatigue testing of reinforcing steel

Lambert, Larry Keith, 1944- January 1969 (has links)
No description available.
36

Inelastic performance of welded cold-formed steel strap braced walls

Comeau, Gilles. January 1900 (has links)
Thesis (M.Eng.). / Written for the Dept. of Civil Engineering and Applied Mechanics. Title from title page of PDF (viewed 2008/04/12). Includes bibliographical references.
37

The microstructure of drill steel

Pollard, Arthur L. January 1909 (has links) (PDF)
Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1909. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed March 24, 2009)
38

Development of performance sections for cold-formed steel residential construction /

N'emedi, Zsolt V., January 1993 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaf 73). Also available via the Internet.
39

Chemical and physical analysis of steel and iron

Ericson, John T. E. January 1907 (has links) (PDF)
Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1907. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed February 20, 2009)
40

Anisotropy and sulfide inclusion effects on tensile properties and fatigue behavior of steels /

Cyril, Nisha S. January 2007 (has links)
Thesis (M.S.)--University of Toledo, 2007. / Typescript. "Submitted as partial fulfillment of the requirements for the Master of Science Degree in Mechanical Engineering." "A thesis entitled"--at head of title. Bibliography: leaves 204-209.

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