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Showing 1 to 20 of 496 for “"Ductility"”.
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Hot ductility of steels
… phase transformation and grain size on hot ductility. Tests were performed in the temperature range 700-1000 °C and at a strain .4 _2 1 rates of (10 —10 S ), generally to simulate the conditions experienced during the straightening operation in the continuous casting process in which …
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Hot ductility of TWIP steels
… Steel) grade owing to its superior toughness and ductility. Recently it has attracted the interest of the automotive and steelmaking industries, as the need for reducing weight to provide better fuel efficiency is of paramount importance with the gradual depletion of fuel resources. A high Al, …
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Seismic ductility of base isolated structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Weldability and hot ductility of iron aluminides
Includes bibliographical references.
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Ductility in high chromium super-ferritic alloys
… propagates in a brittle manner with minimal ductility. The impact toughness therefore relies on the ability of the alloys to withstand crack initiation. The frequency of the crack initiation events is related to the distribution of secondary phases within the matrix and at the grain …
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Ductility demands of filtered earthquakes on reinforced concrete frames
… strengths are required to maintain a certain ductility. These results were indicated by the response of single-degree-of-freedom, elasto-plastic systems in time-step computer analyses. They can also be predicted reasonably accurately by the R-μ equation, a relationship derived from energy …
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Ductility and deformability of FRP strengthened reinforced concrete structures
… and slabs, with particular attention to the ductility of strengthened elements and their failure modes. A total of twenty beams and nine slabs were tested. The beams were 2.6m long, with a cross-section of 100mm x 200mm, and the slabs were 3m long, with a cross-section of 500mm x 100mm. All …
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Strength and ductility of Mg alloys from first-principles
… high specific strength. However, Mg has limited ductility at room temperature due to a high strength anisotropy (~100:1). Thus, forming is performed at ~300°C where the anisotropy is reduced to 4:1. In this work, we investigate the effects of 63 substitutional solutes on basal and prismatic slip …
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Ductility enhancement of high performance cementitious composites and structures
… presents a comprehensive investigation into the ductility enhancement of HP2C structures. Beginning at the micromechanical level, sources of ductility are examined and micro-to-macro relations are derived from homogenization theory and fracture mechanics. These micro-to-macro relations form the …
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Hot ductility and its relationship to transverse cracking in steels
The influence of the Ara on the hot ductility of steels was examined. Tensile samples were heated to 1603K, cooled at 60Kmin" and tested in the temperature range 1323-873K at a strain rate of 3x10-3S-1. The Ara was altered by variations in C, (0.1 to 0.15%C), Mn, (0.6 to 1.4%Mn), Si (0.1 to 0.5%Si) …
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Understanding toughness and ductility in novel steels with mixed microstructures
… understand the mechanisms governing toughness, ductility and ballistic performance in a class of nanostructured carbide-free bainite-austenite steels, sometimes known as ‘superbainite’. The mechanical properties of these alloys have been extensively reported, but their interpretation is not …
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Investigation of high temperature ductility losses in alph-beta titanium alloys
Includes bibliographical references (pages 337-346).
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Weld strength and crack growth ductility from the Lazy-L test
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Evaluation of the ductility of composite steel I-girders in positive bending
Current AASHTO bridge specifications limit the allowable maximum strength of simple spans and positive bending regions with adjacent compact pier sections to a value between the full plastic moment and the hypothetical yield moment of the cross section. The equation used for this strength …
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Strength and Ductility of Concrete Cylinders Confined with Fiber Metal Laminate Composites
… the use FML jackets to enhance the strength and ductility of concrete cylinders. The confinement effect and failure mechanisms of FML confined concrete were analyzed for a range of experimental parameters, including the effect of the number of layers, the fiber orientation, and fabric …
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Quantifying the compressive ductility of concrete in RC members through shear friction mechanics.
… of journal papers in which the compressive ductility of concrete in RC members has been quantified through shear friction mechanics. Firstly, the size dependent stress‐strain models for unconfined and actively confined concrete are derived based on the fundamental mechanics of shear friction …
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Performance Prediction and Evaluation of Low Ductility Steel Moment Frames for Seismic Loads
According to the study, the 20-story building with WCSB configuration in Seismic Design Category C collapsed due to story mechanism and high P-Delta moments. Therefore, it is recommended that WCSB design be restricted to 120 feet tall. All of the buildings with T-stub connections performed well …
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Inelastic behavior and seismic collapse prevention performance of low-ductility steel braced frames
… the east coast of the United States have minimal ductility. Unlike high-ductility systems, whose design encompasses extensive seismic detailing and proportioning requirements to provide said ductility, the analogous requirements for low-ductility steel SFRSs are minimal, and in some instances …
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