Crack-closing performance of NiTi and NiTiNb fibers in cement mortar beams using shape memory effects

Lee, Kun-Joon; Lee, Jong-Han; Jung, Chi-Young; Choi, Eunsoo

doi:10.1016/j.compstruct.2018.03.080

Cited by 62 publications

(10 citation statements)

References 35 publications

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“…This unusual behavior paved the way for innovative applications that were not accessible using conventional materials. In this regard, Lee et al (2018) studied SMA reinforcement to enable self-healing of cracked cement mortar beams; Kim et al (2011) reported on the use of SMAs for enhancing resistance to low-velocity impact in composite plates; Alebrahim et al (2018) explored the behavior of a composite beam consisting of SMA elements under quasi-static loading; Han et al (2016) investigated the mechanical behavior of SMA–glass fiber woven composites for shape morphing of unmanned aerial vehicle (UAV) winglets; Wang et al (2017) demonstrated the improvement in average strain at failure and tensile and compressive strengths in laminate composites reinforced with SMA layers; Thompson and Loughlan (2001) utilized SMA actuators to improve the post-buckling behavior of a composite panel; Hamada et al (1998) explored the thermomechanical response of composites consisting of 6061 Al matrix-reinforced with multiple SMA fibers and so on. Reviews of the applications of SMAs and SMA composites were further provided by several research groups.…”

Section: Introductionmentioning

confidence: 98%

Modeling the behavior of bilayer shape memory alloy/functionally graded material beams considering asymmetric shape memory alloy response

Việt

Zaki

Umer

et al. 2019

Journal of Intelligent Material Systems and Structures

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A new model is proposed to describe the response of laminated composite beams consisting of one shape memory alloy layer and one functionally graded material layer. The model accounts for asymmetry in tension and compression of the shape memory alloy behavior and successfully describes the dependence of the position of the neutral surface on phase transformation within the shape memory alloy and on the load direction. Moreover, the model is capable of describing the response of the composite beam to both loading and unloading cases. In particular, the derivation of the equations governing the behavior of the beam during unloading is presented for the first time. The effect of the functionally graded material gradient index and of temperature on the neutral axis deviation and on the overall behavior of the beam is also discussed. The results obtained using the model are shown to fit three-dimensional finite element simulations of the same beam.

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Section: Introductionmentioning

confidence: 98%

Modeling the behavior of bilayer shape memory alloy/functionally graded material beams considering asymmetric shape memory alloy response

Việt

Zaki

Umer

et al. 2019

Journal of Intelligent Material Systems and Structures

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“…The SMA fibers are studied in recent decades because of the superior properties of the shape memory effect and superelasticity. The recovery stress due to the shape memory effect was the cause of crack-closing [ 13 , 14 , 15 ], prestressing [ 16 , 17 ], and crack-repairing [ 18 ] in the cementitious composite. The superelastic characteristic provides the self-recovering capacity under the unloading condition [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Straining Behavior of Mortar Reinforced by Cold Drawn Crimped and Dog-Bone-Shaped Fibers under Monotonic and Cyclic Compressions

2021

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The straining behavior of the shape memory alloy (SMA) fibers-reinforced mortar was investigated in this study by the monotonic compressive and cyclic compressive tests. Two types of SMA fibers with a crimped and dog-bone shape were used due to the high pullout resistance capacity, which guaranteed that the fibers and mortar matrix were composited well. The plain mortar was mixed with two different compositions to create the higher elastic modulus mortar matrix and the lower elastic modulus mortar matrix compared with the elastic modulus of SMA fibers. The results of the experimental test indicated that the non-heated SMA fibers could control the strains in both elastic and plastic phases; in which, the crimped fiber was more effective in precracking due to the higher composite capacity while the dog-bone-shaped fiber had a higher effect in post-cracking. After heating, the dog-bone-shaped fiber slipped more than that of the crimped fiber; thus, the heated crimped fiber was more effective than the heated dog-bone-shaped fiber in controlling strains after cracking. The effect of SMA fibers on the elastic modulus depended on both the elastic modulus of mortar matrix and the property of SMA fibers. In the plastic phase, the fibers were effective on reducing the speed of damage in monotonic case. An equation using reinforcing index was suggested for damage evolution in the cyclic case.

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“…Recently, reinforcing fibers made of shape memory alloys (SMAs) have been studied as active reinforcing fibers because they can provide prestressing before cracking [ 21 , 22 , 23 , 24 , 25 , 26 ], so they can delay crack-initiation. They also provide crack-closing capacity using the recovery stress because of the shape memory effect [ 27 , 28 , 29 ]. Therefore, the prestressing and crack-closing capacity can be classified as active effects that cannot be provided by passive fibers, namely steel and synthetic fibers.…”

Section: Introductionmentioning

confidence: 99%

Active Reinforcing Fiber of Cementitious Materials Using Crimped NiTi SMA Fiber for Crack-Bridging and Pullout Resistance

Choi

Jeon

2020

Materials

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This study investigated the recovery stress and bond resistance of cold drawn crimped SMA fiber using two different initial diameters of 1.0 and 0.7 mm. These characteristics are important to the active prestressing effect and crack-closing of the fiber. NiTi SMA fiber was used for the cold drawing, and then crimped shapes were manufactured with various wave heights. After that, tensile, recovery, and pullout tests were conducted. The cold drawn crimped fiber showed softening tensile behavior more clearly than the cold drawn straight fiber when not subjected to heating, whereas they had the same tensile behavior under heating. The recovery stress and the residual stress of the crimped fibers were less than those of the straight fiber with the same diameter. Moreover, crimped fibers with a large diameter and higher wave height would induce more recovery stress and residual stress. The maximum pullout resistance of the crimped fiber was a function of the wave depth, embedded length, yield strength, and flexural rigidity of the fiber.

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Crack-closing performance of NiTi and NiTiNb fibers in cement mortar beams using shape memory effects

Cited by 62 publications

References 35 publications

Modeling the behavior of bilayer shape memory alloy/functionally graded material beams considering asymmetric shape memory alloy response

Modeling the behavior of bilayer shape memory alloy/functionally graded material beams considering asymmetric shape memory alloy response

Straining Behavior of Mortar Reinforced by Cold Drawn Crimped and Dog-Bone-Shaped Fibers under Monotonic and Cyclic Compressions

Active Reinforcing Fiber of Cementitious Materials Using Crimped NiTi SMA Fiber for Crack-Bridging and Pullout Resistance

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