Optimizing penetration resistance of Ni-Ti shape memory alloy fiber reinforced concrete under high impact velocity: a comprehensive study

IF 7.4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-10-05 DOI:10.1016/j.jobe.2025.114250

Weiwei Sun , Yuqing Wu , Jun Yuan , Xudong Gao , Shibin Lu , Wenze Ni , Jun Feng

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引用次数: 0

Abstract

This paper investigates the penetration resistance of shape memory alloy fiber reinforced concrete (SMAFRC) in protection engineering. Tensile and temperature residual stress tests on SMA wires with different pre-strains revealed that increasing pre-strain enhanced the wire elastic modulus, yield strength, and recovery stress, while reducing its elongation at break. Through pull-out tests, a peak bond strength of 3.2 MPa was observed on SMA wires at a 5 % pre-strain, a 33.3 % increase compared to SMA wires without pre-strain. Furthermore, the compressive strength of SMAFRC incorporated with high fiber content even exceeded 300 MPa. Subsequently, penetration tests on SMAFRC with varying SMA fiber volume ratios (0 %–7 %) and pre-strains (0 %, 2.5 %, 5 %) revealed that a 3 % fiber volume ratio optimally enhanced penetration resistance. At this ratio, the crater area, volume, equivalent diameter, and residual velocity of the projectile were significantly reduced. Finally, a validated 3D mesoscale model showed that SMA fibers significantly improve the penetration resistance of concrete, making SMAFRC a promising high-performance material.

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高冲击速度下Ni-Ti形状记忆合金纤维增强混凝土抗侵彻性能优化的综合研究

对形状记忆合金纤维混凝土在防护工程中的抗侵彻性能进行了研究。对不同预应变的SMA丝进行拉伸和温度残余应力试验表明，增加预应变可提高丝的弹性模量、屈服强度和恢复应力，同时降低丝的断裂伸长率。通过拉拔试验，在5%的预应变下，SMA钢丝的峰值粘结强度为3.2 MPa，比没有预应变的SMA钢丝提高了33.3%。此外，高纤维含量的SMAFRC抗压强度甚至超过300mpa。随后，对SMAFRC进行了不同SMA纤维体积比（0% - 7%）和预应变（0%、2.5%、5%）的侵穿测试，结果表明，3%的纤维体积比最优地增强了SMAFRC的抗侵穿能力。在此比率下，弹丸的弹坑面积、体积、当量直径和残余速度均显著减小。最后，经过验证的三维中尺度模型表明，SMA纤维显著提高了混凝土的抗渗透能力，使SMAFRC成为一种很有前途的高性能材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.