Behavior of mortar beams with randomly distributed superelastic shape memory alloy fibers

Sherif, Muhammad M.; Khakimova, Evelina; Ozbulut, Osman E.; Harris, Devin K.; Ozyildirim, H. Celik

doi:10.1177/1045389x17721029

Cited by 28 publications

(10 citation statements)

References 21 publications

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“…Some of these applications require small-diameter SMA wires. For example, several researchers have investigated the use of short SMA fibers with a diameter ranging from 0.2 to 1 mm in cementitious composites to provide crack-recovery as well as recentering capabilities (Sherif et al, 2017, 2018). However, most applications of SMAs for civil structures require large-size elements.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Sherif

Ozbulut

2020

Journal of Intelligent Material Systems and Structures

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Superelastic shape memory alloys are a unique class of smart materials that can recover up to 6% strains. Due to their appealing properties such as high energy dissipation and corrosion resistance, several researchers have assessed the use of such materials in numerous applications ranging from biomedical to civil engineering. This article investigates the thermomechanical and electrical response of a NiTi shape memory alloy cable with a complex configuration subjected to cyclic loading of various strain amplitudes ranging from 3% to 7%. The cable consists of several multi-layered strands with a cumulative outer diameter of 5.5 mm. The thermomechanical results indicate a good correlation of the change in cable temperature with the applied strains and maximum stresses. The temperature history can be used to map the degradation pattern of the shape memory alloy cable. In addition, due to the complex geometry of the cable, the global electrical resistance change does not predict the strain/stress state of the cable; however, it can be used to predict the onset of phase transformations.

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Section: Introductionmentioning

confidence: 99%

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Sherif

Ozbulut

2020

Journal of Intelligent Material Systems and Structures

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“…Sherif et al [ 27 ] performed an experimental investigation on the performance of mortar mixtures reinforced with different volume fractions of SMA fibers under cyclic loading. They found that the mortar reinforced with SMA fibers exhibited considerable improvements in ductility.…”

Section: Application Of Niti Smas In Civil Infrastructuresmentioning

confidence: 99%

Superelastic Nickel–Titanium (NiTi)-Based Smart Alloys for Enhancing the Performance of Concrete Structures

2023

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Recent advances in materials science have led to the development of smart materials that can continuously adapt to different loading conditions and changing environment to meet the growing demand for smart structural systems. The unique characteristics of superelastic NiTi shape memory alloys (SMAs) have attracted the attention of structural engineers worldwide. SMAs are metallic materials that can retrieve their original shape upon exposure to various temperatures or loading/unloading conditions with minimal residual deformation. SMAs have found increasing applications in the building industry because of their high strength, high actuation and damping capacities, good durability, and superior fatigue resistance. Despite the research conducted on the structural applications of SMAs during the previous decades, the existing literature lacks reviews on their recent uses in building industry such as prestressing concrete beams, seismic strengthening of footing–column connections, and fiber-reinforced concrete. Furthermore, scarce research exists on their performance under corrosive environments, elevated temperatures, and intensive fires. Moreover, the high manufacturing cost of SMA and the lack of knowledge transfer from research to practice are the main obstacles behind their limited use in concrete structures. This paper sheds light on the latest progress made in the applications of SMA in reinforced concrete structures during the last two decades. In addition, the paper concludes with the recommendations and future opportunities associated with expanding the use of SMA in civil infrastructures.

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“…The development of superelastic SMA fibers is still in its early stage, where strands and wires (Daghash and Ozbulut, 2016;Sherif et al, , 2018 were mostly considered. Bonding is critical issue that cannot be easily resolved because form-setting of superelastic SMA fibers is difficult and expensive and often requires special treatment such as annealing.…”

Section: Sma Fibersmentioning

confidence: 99%

Emerging superelastic SMA core damping elements for seismic application

Fang

Yam²

2023

Front. Built Environ.

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Structural and non-structural damage reported after recent strong earthquakes promotes a fundamental shift in structural design target from “collapse resistance” to “fast structural function recovery”. A unique class of metal called superelastic shape memory alloy (SMA) has been emerging as a promising solution to enhance the seismic resilience of structures. SMA core damping elements are the basic constituents of many newly-proposed seismic resistant members or devices, and they are directly responsible for the safety, integrity, and economical efficiency of the structures using them. This mini-review paper offers a comprehensive summary of the emerging SMA core damping elements recently developed, covering SMA monofilament wires, fibers, bars, flat plates, U-shaped plates, angles, cables, rings, helical springs, disc springs, and friction springs. These SMA core elements are suitable for various seismic application scenarios, and their efficiency have been verified through either full-scale or proof-of-concept experimental studies. The basic working principles, advantages, and potential shortcomings of these elements are discussed, and future research needs are outlined.

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Behavior of mortar beams with randomly distributed superelastic shape memory alloy fibers

Cited by 28 publications

References 21 publications

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Thermomechanical and electrical response of a superelastic NiTi shape memory alloy cable

Superelastic Nickel–Titanium (NiTi)-Based Smart Alloys for Enhancing the Performance of Concrete Structures

Emerging superelastic SMA core damping elements for seismic application

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