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    Smart Prestressing with Shape-Memory Alloy

    Source: Journal of Engineering Mechanics:;1998:;Volume ( 124 ):;issue: 010
    Author:
    Arup K. Maji
    ,
    Ihosvany Negret
    DOI: 10.1061/(ASCE)0733-9399(1998)124:10(1121)
    Publisher: American Society of Civil Engineers
    Abstract: Shape-memory effect in nickel-titanium (nitinol) alloy was successfully utilized as a way of inducing additional prestressing in concrete. Strands made with NiTi (nickel/titanium) shape-memory alloy (SMA) wires were elongated beyond their plastic limit and subsequently were embedded in model concrete (mortar) beams. Upon electrical heating, a martensite-to-austenite phase transformation takes place and the material undergoes large shrinkage strains. This strain energy can be used to generate a significant prestressing force in concrete. Potentially, this provides a means of creating a “smart bridge,” where the amount of prestress can be increased or decreased as needed. Such a structure could actively accommodate additional loading, or remedy prestress losses over time. Properties of the SMA material and the micromechanics of its bond with concrete were investigated. Strands made with SMA wires were electrically actuated to induce deflection and failure in concrete (mortar) beams. Optical microscopy and the acoustic emission technique were used to understand the actuation mechanisms.
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      Smart Prestressing with Shape-Memory Alloy

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    http://yetl.yabesh.ir/yetl1/handle/yetl/84694
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    contributor authorArup K. Maji
    contributor authorIhosvany Negret
    date accessioned2017-05-08T22:38:26Z
    date available2017-05-08T22:38:26Z
    date copyrightOctober 1998
    date issued1998
    identifier other%28asce%290733-9399%281998%29124%3A10%281121%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/84694
    description abstractShape-memory effect in nickel-titanium (nitinol) alloy was successfully utilized as a way of inducing additional prestressing in concrete. Strands made with NiTi (nickel/titanium) shape-memory alloy (SMA) wires were elongated beyond their plastic limit and subsequently were embedded in model concrete (mortar) beams. Upon electrical heating, a martensite-to-austenite phase transformation takes place and the material undergoes large shrinkage strains. This strain energy can be used to generate a significant prestressing force in concrete. Potentially, this provides a means of creating a “smart bridge,” where the amount of prestress can be increased or decreased as needed. Such a structure could actively accommodate additional loading, or remedy prestress losses over time. Properties of the SMA material and the micromechanics of its bond with concrete were investigated. Strands made with SMA wires were electrically actuated to induce deflection and failure in concrete (mortar) beams. Optical microscopy and the acoustic emission technique were used to understand the actuation mechanisms.
    publisherAmerican Society of Civil Engineers
    titleSmart Prestressing with Shape-Memory Alloy
    typeJournal Paper
    journal volume124
    journal issue10
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(1998)124:10(1121)
    treeJournal of Engineering Mechanics:;1998:;Volume ( 124 ):;issue: 010
    contenttypeFulltext
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