The Effect of Fiber End on the Bonding Mechanical Properties between SMA Fibers and ECC Matrix

Abstract

In order to investigate the effect of fiber end on the bonding mechanical properties between shape memory alloy (SMA) fibers and Engineered Cementitious Composites (ECC), this study designed and fabricated five groups of specimens with variations in SMA fiber end shape, diameter and depth-to-diameter ratio. Direct tensile tests were conducted on these specimens under displacement control. The failure modes, stress–strain curves and various performance indicators were analyzed to evaluate the bonding mechanical properties and the effects of different factors. The results revealed that for straight-end SMA fibers, increasing the diameter and depth-to-diameter ratio both led to a decrease in bonding strength. On the other hand, the N-shaped end provided sufficient anchorage force for SMA fibers, resulting in a maximum pull-out stress of 926.3 MPa and a fiber strength utilization of over 78%. Increasing the fiber diameter enhanced the maximum pull-out stress and maximum anchorage stress for N-shaped-end SMA fibers but reduced the fiber strength utilization. These research findings provide a solid theoretical basis and data support for achieving a synergistic effect between SMA fibers and the ECC matrix.

Estabilización De Mezclas Asfálticas Stone Mastic Asphalt (Sma) Mediante Inhibidores De Drenaje Como Fibras De Basalto

“…Estas fibras actúan como agentes estabilizadores que ayudan a mantener la uniformidad de la mezcla, evitando la separación de los componentes y asegurando una distribución homogénea de los agregados y el ligante asfáltico (Jung y Lee, 2020). Además, Yang et al (2023) señalan que la correcta selección y dosificación de los agregados también contribuyen a mejorar la resistencia a la segregación. El diseño cuidadoso de la gradación de los agregados, considerando la forma, tamaño y textura, puede ayudar a optimizar la cohesión de la mezcla, reduciendo así el potencial de segregación.…”

Advances in Shape Memory Alloy-Based Reinforcement in Steel Structures: A Review

“…SMAs have excellent fatigue properties and their fatigue life can reach 103~107 cycles, depending on the strain range/amplitude, and finally fractures just like any other engineering materials [29][30][31][32][33][34]. In addition, Lin et al [35] investigated the effect of temperature on the fatigue performance of SMAs and experimentally studied the fatigue life of SMAs at four temperatures with different strain amplitudes; the results of the experiment are shown in the Figure 6.…”

Optimizing Superelastic Shape Memory Alloy Fibers (SMAF) for Enhancing Pullout Performance in Engineered Cementitious Composites (ECC)

“…Previous investigations primarily examined the effects of fiber shape, cementitious, and ECC matrix on the bond slip characteristics of superelastic SMA fibers in cementitious ECC mixtures. [25,26,[33][34][35][36][37]. However, comprehensive and systematic investigations of the pullout behavior in SMA Fiber-Reinforced Engineered Cementitious Composite (SMAF-ECC) matrices are notably limited.…”