Crack-Closing Performance of Shape Memory Alloy Fiber Reinforced ECC under Cyclic Tension

Abstract

Abstract: The effects of shape memory alloy (SMA) fiber with different content and different diameter on tensile stress-strain relationship, residual strain, crack width and crack recovery rate of engineered cementitious composites (ECC) were studied by uniaxial cyclic tensile test. The results show that the addition of knotted-shaped SMA fiber improves the ultimate strain and ultimate tensile strength of ECC, and the strain recovery rate of pure ECC without SMA fiber is 12% in the late cycle. The strain recovery rate of SMAF-ECC specimens doped with 1.00% (volume fraction) 0.5 mm SMA fiber is as high as 69%, and the crack recovery rate of SMA fiber with 1.00% (volume fraction) 0.5 mm diameter enhanced ECC is 77%. If the fiber diameter grows in a certain range, the strain and fracture recovery rate can be improved, if the fiber diameter is too small, the recovery rate will decrease. The research results provide a theoretical basis for the popularization and application of the new SMAF-ECC specimens.

Key words: shape memory alloy fiber, fiber reinforced, hyperelasticity, cyclic tensile, crack width, strain recovery rate, crack recovery rate

CLC Number:

TU352.11

LIU Yu, YANG Zhao, DENG Xin, XIONG Hao. Crack-Closing Performance of Shape Memory Alloy Fiber Reinforced ECC under Cyclic Tension[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 816-826.

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