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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.
41

A preliminary study of the design and economics of prestressed steel structures

Sukdhisri, Suntat, 1928- January 1959 (has links)
No description available.
42

A comparison in the use of aluminum and steel in the design of a highway bridge

Jimenez, R. A. (Rudolf August) January 1952 (has links)
No description available.
43

Welding in modern steel construction

Magee, Leon Reono, 1909- January 1935 (has links)
No description available.
44

The influence of fabrication schedules on the mechanical behavior of a-441 steel

Pereyra, Manuel Rafael 08 1900 (has links)
No description available.
45

The fracture toughness of plain carbon and low alloy steel castings /

Barnhurst, Robert James. January 1983 (has links)
The development of precise data for the effect of chemistry and processing variables on the fracture toughness of low to medium carbon cast steels, is paramount to an increased understanding of the fracture behaviour of these important engineering materials. This knowledge would, in itself, lead to improvements in alloy development/selection rationale and increased cast steel usage, particularly in critical areas. / Toward this end, an investigation into the influence of Cr, Mn and Ni additions on the room temperature fracture toughness and flow properties of 0.30, 0.40 and 0.55 wt% C cast alloys was conducted. In order to avoid the chemical and processing complexity normally associated with commercial castings, the study was undertaken on heavy section castings produced in the laboratory from melts composed of commercial purity ingredients. Measurements were conducted on three-point bend test pieces machined from heat-treated castings. The fracture toughness techniques used included LEFM (K(,IC)), J integral and COD ((delta)(,c)). A potential drop method was employed to record crack initiation. / Very high room temperature fracture toughnesses were achieved in the majority of the alloys examined, with only three alloys having K(,IC) values of less than 150 MN.m('-3/2) or COD, (delta)(,c), values of less than 0.1 mm. Further, yield stress ((sigma)(,ys)) values were found to lie within 80-105% of those recorded for commercial castings of comparative composition. / At the 0.30 and 0.40 wt% C levels it was found that the room temperature fracture toughness of the alloys was relatively independent of the microstructure as well as the amount and particular addition element employed, although variations in the tensile properties were noted. / At the 0.55 wt% C level significant differences in the fracture behaviour were caused by the individual element additions. Manganese was found to improve the toughness of the high carbon alloys, while nickel produced little change and chromium had a negative effect on toughness. In each case the influence of these elements was manifested in microstructural differences. / The results of this study are reviewed in the light of the limited data available from commercial cast steels and the need for improved toughness performance without undue loss of yield strength and other properties. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI
46

Behaviour of steel and steel-concrete composite beams and beam-to-column connetions at elevated temperatures

Heidarpour, Amin, Civil & Environmental Engineering, Faculty of Engineering, UNSW January 2007 (has links)
The current research work investigates the behaviour of steel and composite beams as well as beam-to-column connections at elevated temperatures. Significant attention is needed to identify the main issues. as the behaviour is profoundly different from that at ambient temperature. Local buckling of the beam flange outstands has been found to be highly significant in accelerating the development of catenary action in fire, since this action is reliant on hinges forming which may result from local buckling. Local buckling of the beam web, which experiences a non-uniform temperature variation, is also important because the mechanical properties of the steel are degraded non-uniformly from their ambient values. Current formulations for web buckling at ambient temperature therefore need substantial revision at elevated temperatures. Very large compressive forces are developed within the beams initially and these induce large stresses in the column web; hitherto this has not been considered. Developing a formulation representing the mechanics of this potential failure zone in the column web in the compression region of the connection is a useful and needed addition to research in the topic. Predicting the critical temperature in a connection that causes failure of the bolts, end plate and column flange in the tension zone of the connection is considered in this research work. An elastic analysis of a panel zone in a rigid or semi-rigid joint in a steel frame, which is based on simple equilibrium considerations that takes into account the shear and flexural deformations of the panel zone, is developed at elevated temperatures. In order to model the structural response of a composite beam restrained by cooler members in a steel compartment fire in a frame structure at elevated temperature, recourse is needed to a geometric nonlinear formulation, since the beam transverse deflections are not negligible and the axial eompressive force in the member is also substantial at the early stages of the fire. This thesis presents such a formulation, which incorporates partial interaction between the concrete slab and steel component, as well as the degradation of the stiffnesses of the components of the composite beam prior to yield at elevated temperature.
47

Durability of nitinol for structural applications

McCarty, David, Hughes, Mary Leigh, January 2006 (has links) (PDF)
Thesis(M.S.)--Auburn University, 2006. / Abstract. Vita. Includes bibliographic references (p.113-116).
48

Bracing design requirements for inelastic members /

Li, Guzhao. January 2002 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references (leaves 180-184). Also available in an electronic version.
49

Ductile tearing of high-toughness steel members /

Gentilcore, Michael L., January 1996 (has links)
Thesis (Ph. D.)--Lehigh University, 1996. / Includes vita. Bibliography: leaves 215-219.
50

Object - oriented steel member design framework /

Hewetson, C. G. January 2005 (has links)
Thesis (MScIng)--University of Stellenbosch, 2005. / Bibliography. Also available via the Internet.

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