Recovery stress formation in a restrained Fe–Mn–Si-based shape memory alloy used for prestressing or mechanical joining

Lee, Wookjin; Weber, Benedikt; Leinenbach, Christian

doi:10.1016/j.conbuildmat.2015.07.098

Cited by 94 publications

(50 citation statements)

References 30 publications

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“…In this context, some of the present authors have recently developed an Fe‐17Mn‐6Si‐10Cr‐4Ni‐1(V,C) SMA which showed very promising properties with regard to potential commercial applications . This alloy could generate a high recovery stress of up to 500 MPa after heating to a temperature of only 130–160 °C, a high fatigue strength of 450 MPa, and the alloy could be produced by relatively cheap manufacturing process with casting in atmospheric conditions .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Lee

Partovi‐Nia

Suter

et al. 2015

Materials & Corrosion

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The corrosion behavior of an Fe‐17Mn‐6Si‐10Cr‐4Ni‐1(V,C) shape memory alloy was investigated using electrochemical methods with regard to its applications as reinforcing element in pre‐stressed concrete structures. The alloy was tested in three kinds of simulated concrete pore solutions, and open circuit potential and linear polarization resistance were monitored with and without chloride addition. The results were compared with a reference material of conventional structural steel, so called S500 (EN 10149 PT2 standard). It is shown that the shape memory alloy has superior corrosion resistance than the reference material steel S500, and, therefore, can be used as pre‐stressed reinforcing element in concrete without any serious corrosion problem. Several practical issues that can influence the corrosion behavior of the alloy in its use of pre‐stressing reinforcements, such as the effects of strain and surface oxidation by heating, have been also discussed through the electrochemical tests in the simulated concrete pore solutions.

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Section: Introductionmentioning

confidence: 99%

Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Lee

Partovi‐Nia

Suter

et al. 2015

Materials & Corrosion

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“…Twenty years later, research activities at the Swiss Federal Laboratories for Materials Science and Technology (Empa) were launched in order to develop an own iron‐based SMA and related products suitable for the construction market . Another decade later, efforts toward a final market distribution were started . Prototype product development resulted in ribbed bars with a circular cross section as well as ribbed strips.…”

Section: Introductionmentioning

confidence: 99%

Flexural strengthening of structural concrete with iron‐based shape memory alloy strips

Michels

Shahverdi

Czaderski

2017

Structural Concrete

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This paper presents a study on structural concrete retrofitting with iron‐based shape memory alloys (Fe‐SMA). Initially, the Fe‐SMA strip is prestrained at ambient temperature with a remaining deformation. Subsequently, it is applied on the structure as an end‐anchored strip. The shape memory effect, characterized by the material’s back transformation to its initial shape, is created upon heating at an elevated temperature of about 160°C. In this case, a mechanical end anchorage refrains the alloy to develop its recovery in strain and hence transforms it to a recovery stress, which results in a prestress in the concrete substrate. The ease of installation of the strip itself combined with an efficient and rapid direct fastening method render this strengthening technique highly competitive for the market. In this paper, material characteristics such as the ductile behavior of the alloy in tension as well as its activation by means of fast resistive heating are presented. The application on reinforced concrete beams is described and static loading tests are shown in order to demonstrate the efficiency of the technique. An improved structural behavior at service state proves that Fe‐SMA strips are an efficient and innovative method for structural strengthening. Finally, a site application is presented. It demonstrates that Fe‐SMA strips are a competitive solution for replacing existing, more pricy, and technically more complicated methods.

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“…In the family of metallic shape memory alloys (SMAs), Fe-Mn-Si SMAs exhibit relatively low costs of both raw materials and processing in comparison with their Ni-Ti alloys and Cu-based counterparts [4,5]. This makes Fe-Mn-Si shape memory alloys a promising candidate for various civil engineering applications such as pipe joints and rail coupling [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

Hodgson

Cao

2017

Preprint

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This work investigated the isothermal holding time dependence of the densification, microstructure, weight loss and tensile properties of Fe-Mn-Si powder compacts. Elemental Fe, Mn and Si powder mixtures with a nominal composition of Fe-28Mn-3Si (in weight percent) were ball milled for 5h and subsequently pressed under a uniaxial pressure of 400 MPa. The compacted Fe-Mn-Si powder mixtures were sintered at 1200 °C for 0, 1, 2 and 3 h, respectively. In general, the density, weight loss and tensile properties increased with the increase of isothermal holding time. A significant increase in density, weight loss and tensile properties occurred in the compacts being isothermally held for 1 h, as compared to those with no isothermal holding. However, further extension of isothermal holding time (2 and 3h) only played a limited role in promoting the sintered density and tensile properties. The weight loss of the sintered compacts was mainly caused by the sublimation of Mn in Mn depletion region on the surface layer of the sintered Fe-Mn-Si compacts. The length of the Mn depletion region increased with the isothermal holding time. A single α-Fe phase was detected on the surface of all the sintered compacts, and the locations beyond the Mn depletion region were comprised of a dual dominant γ-austenite and minor ε-martensite.

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Recovery stress formation in a restrained Fe–Mn–Si-based shape memory alloy used for prestressing or mechanical joining

Cited by 94 publications

References 30 publications

Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Flexural strengthening of structural concrete with iron‐based shape memory alloy strips

Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

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