Mechanical Properties of NiTiNb Shape Memory Alloy Subjected to a Harsh Corrosive Environment

Zhao, Hang; Andrawes, Bassem

doi:10.1061/(asce)mt.1943-5533.0001725

Cited by 14 publications

(6 citation statements)

References 22 publications

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“…Previous research has shown that NiTiNb-SMA has large hysteresis, the recovery stress can be over 300 MPa under certain conditions [31][32][33][34]. Moreover, it has been widely used for its remarkable corrosion resistance and durability [35]. Hence, the NiTiNb-SMAs with a diameter of 2.0 mm (produced by Beijing Nonferrous Metal Research Institute) were adopted in this study.…”

Section: Design Scheme Of Anchorage Systemmentioning

confidence: 99%

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A new near-surface-mounted anchorage system of shape memory alloys for local strengthening

Pan

Zhang

et al. 2019

Smart Mater. Struct.

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Shape memory alloys (SMAs) are increasingly used as local reinforcements to control deformation and crack development of reinforced concrete members. This paper presented a new near-surface-mounted strengthening approach, in which the bond performance between SMAs and cement mortar is concerned. To ensure a reliable anchorage of smooth SMA wires embedded in cement mortar, three types of anchors, i.e. the U-shaped stirrups (AU), the block anchors with the flat head bolts (AF), and the block anchor with the hex socket bolts (AH), were suggested. The tensile and recovery tests were firstly undertaken to verify the anchorage performance between smooth SMA wires and the anchors. Then the bond performance of anchored SMA wires embedded in cement mortar was studied by pull-out tests. The results showed that the proposed AH anchor could ensure a reliable anchorage between smooth SMA wires and cement mortar within a short embedded length.

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Section: Design Scheme Of Anchorage Systemmentioning

confidence: 99%

“…The results of the pullout tests. (at the free end) Sliding of the wire 0.72(at the load end) With AH anchor 3231 35. 1028.57 2.38(at the free end) Fracture of the wire 4.17(at the load end)…”

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A new near-surface-mounted anchorage system of shape memory alloys for local strengthening

Pan

Zhang

et al. 2019

Smart Mater. Struct.

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“…2 The benefits of using unbonded and exposed NiTiNb wires are in facilitating inspection and maintenance, while also being easily replaceable. The authors selected NiTiNb SMA wires for their high corrosion resistance 18 and negligible stress relaxation, 19 which makes them uniquely suitable for unbonded posttensioning applications. A recently published experimental study by the authors demonstrated that the restrained recovery of NiTiNb SMA wires generates stresses that can be transferred to damaged reinforced concrete beams via end anchorages as upward corrective forces (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of reinforced concrete beams posttensioned with supplemental unbonded near surface mounted nickel‐titanium‐niobium shape memory alloy wire reinforcement

Sinha

Tatar

2023

Structural Concrete

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A novel posttensioning technique using nickel‐titanium‐niobium (NiTiNb) shape memory alloy (SMA) wires for the repair of reinforced concrete beams was evaluated numerically. A finite element model of a reinforced concrete beam was developed within a damage mechanics framework to simulate concrete cracking and subsequent posttensioning. The predicted yield and ultimate moment capacities of the simulated posttensioned beams were up to 14% less than the corresponding experimental results. Cumulative discrepancies in the assumed material models led to the conservative model results. The effects of concrete tensile damage, SMA reinforcement ratio, SMA‐concrete interaction (bonded vs. unbonded), and the effective prestress on the service and ultimate behavior of the posttensioned beam were evaluated. Partial loss of prestress in the SMA due to elastic shortening of the concrete was insignificant (<3%) because of the relatively low elastic modulus of the SMA. Increasing the SMA reinforcement ratio by three times increased the yield moment of the posttensioned beam by 99%. Reducing the effective SMA prestress to 80% of the initial prestress to account for the possible losses resulted in a decrease in the yield moment by up to 7.8%.

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“…However, even a slight variation in the content of SMA alloy would lead to significant changes in thermo-mechanism [7]. Among various SMA types, NiTiNb SMA is typically characterized with wide thermal hysteresis Besides, other factors that influence recovery stress stability like temperature changing [18], cumulative strain level [22], corrosion condition [23], strain location and strain rate [24] were also studied by several researchers.…”

Section: Introductionmentioning

confidence: 99%

Investigation on recovery stress and stability of hot-drawn Ni₄₇Ti₄₄Nb₉ SMA

Pan

Yan

Zhang

et al. 2023

Smart Mater. Struct.

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Ni47Ti44Nb9 shape memory alloys (SMA) were applied to bridge pier column to resist earthquake loads by the force of recovery stress over the past decades. However, the application of hot-drawn SMA on pier column reinforcement is hardly researched despite the advantages of cost savings and simplifying service process compared to annealed SMA. Aiming at exploring the usability of hot-drawn SMA on the reinforcement, this paper focused on certain behaviors about pre-strain, thermal activation and partial recovery of recoverable strain that inﬂuence the capacity of constraint SMA to gain recovery stress, and then researched recovery stress stability and tensile properties of constraint SMA under cyclic loads both at room temperature and low temperature. Test pieces adopted in this study were 2 mm diameter hot-drawn NiTiNb SMA wires. All setups involved in the tests were self-developed. The states of recovery stress and its stability were mainly evaluated by three tests: uniaxial tensile test, thermal activation test and cyclic loading test. The results marked that hot-drawn SMA could obtain suﬃcient recovery stress when deformed at room temperature. Moreover, the stability of recovery stress under cyclic loading and low temperature could satisfy the demands of pier column reinforcement for practical use.

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Mechanical Properties of NiTiNb Shape Memory Alloy Subjected to a Harsh Corrosive Environment

Cited by 14 publications

References 22 publications

A new near-surface-mounted anchorage system of shape memory alloys for local strengthening

A new near-surface-mounted anchorage system of shape memory alloys for local strengthening

Finite element modeling of reinforced concrete beams posttensioned with supplemental unbonded near surface mounted nickel‐titanium‐niobium shape memory alloy wire reinforcement

Investigation on recovery stress and stability of hot-drawn Ni₄₇Ti₄₄Nb₉ SMA

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Mechanical Properties of NiTiNb Shape Memory Alloy Subjected to a Harsh Corrosive Environment

Cited by 14 publications

References 22 publications

A new near-surface-mounted anchorage system of shape memory alloys for local strengthening

A new near-surface-mounted anchorage system of shape memory alloys for local strengthening

Finite element modeling of reinforced concrete beams posttensioned with supplemental unbonded near surface mounted nickel‐titanium‐niobium shape memory alloy wire reinforcement

Investigation on recovery stress and stability of hot-drawn Ni47Ti44Nb9 SMA

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Investigation on recovery stress and stability of hot-drawn Ni₄₇Ti₄₄Nb₉ SMA