FRP/形状记忆合金复合材料力学性能和可回复性能试验研究  

Experimental study on mechanical properties and recoverability of FRP/shape memory alloy composites

作　　者：惠迎新[1] 薛彦杰 王文炜 谈笑 HUI Yingxin;XUE Yanjie;WANG Wenwei;TAN Xiao(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Department of Bridge Engineering,School of Transportation,Southeast University,Nanjing 211189,China;Stevens Institute of Technology,Hoboken 07030,America)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]东南大学交通学院桥梁工程系,南京211189 [3]史蒂文斯理工学院,霍博肯07030

出　　处：《复合材料学报》2023年第9期5302-5314,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52268077,51878156);宁夏回族自治区重点研发计划(2020 BFG02005)。

摘　　要：利用形状记忆合金(SMA)的回复效应将预应力引入到纤维增强复合材料(FRP)中是一种新理念。本文将FRP与SMA复合,形成一种新的复合材料用于结构加固修复中,开展了FRP/SMA复合材料的力学性能和受限回复性能试验。在力学性能试验中,将SMA丝的数量和直径作为试验变量,分析它们对FRP/SMA复合材料拉伸性能的影响;在受限回复试验中,将SMA丝直径和预应变水平作为试验变量,分析其对SMA丝及FRP/SMA复合材料可回复性能的影响。在试验研究的基础上,给出了第一类FRP/SMA复合材料的材料强度、极限应变和弹性模量的预测模型和FRP/SMA复合材料回复应力-温度模型。试验结果表明,在一定掺量内,提高掺入SMA丝的数量能够提高复合材料的最大断裂应变和抗拉强度,掺入的丝数量越多,断后残余强度越大。SMA丝的直径显著影响复合材料试件的拉伸弹性模量。在受限回复性能试验中,FRP/SMA复合材料的回复应力在相变区间内随温度的升高呈明显的上升趋势,复合材料的最大回复应力将会随预应变水平的提高而增大。提出的基于Brinson模型的修正模型,预测值与试验值吻合较好,可以有效地预测SMA丝和FRP/SMA复合材料的回复应力与温度的关系。Using the recovery effect of shape memory alloy(SMA)to introduce prestress into fiber reinforced polymer(FRP)is a new idea.In this paper,FRP and SMA are compounded to form a new composite material for structural strengthening and repair.The mechanical properties and limited recovery properties of FRP/SMA composites are tested.In the mechanical property test,the number and diameter of SMA wires are taken as test variables,and their effects on the tensile properties of FRP/SMA composites are analyzed.In the limited recovery test,the SMA wire diameter and pre-strain level were taken as test variables to analyze their effects on the recoverable properties of SMA wire and FRP/SMA composites.On the basis of experimental research,the regression equations of recovery stress temperature of SMA wire and FRP/SMA composites are given.The test results show that increasing the number of SMA wires can improve the maximum fracture strain and tensile strength of the composite.The more wires are added,the greater the residual strength after fracture.The diameter of SMA wire significantly affects the tensile elastic modulus of composite specimens.In the limited recovery performance test,the recovery stress of FRP/SMA composites shows an obvious upward trend with the increase of temperature in the phase transition range,and the maximum recovery stress of composites will increase with the increase of pre-strain level.The modified model based on Brinson’s model is proposed,and the predicted values are in good agreement with the experimental values,which can effectively predict the relationship between the recovery stress and temperature of SMA wire and FRP/SMA composites.

关 键 词：纤维增强复合材料 形状记忆合金 复合材料 形状记忆效应 受限回复性能 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]