Abstract
Steel bar and Basalt Fiber are combined to obtain a new structural material with high strength, high elastic modulus, high toughness, corrosion resistance, low cost and other excellent comprehensive performance: Steel Basalt Fiber Composite Bars (SBFCBs). In this paper, three different types of composite bars were tested by monotonic tensile tests, and the failure patterns of steel bars were introduced in the process of stretching, and the yield strength, ultimate strength, elastic modulus and stress-strain curves of steel bars were obtained. Test results showed that the stress-strain curve of SBFCBs was obviously double-folded, and SBFCBs exhibited stable post-yielding stiffness after the reinforcement yielded. The stress-strain curve model of SBFCBs under uniaxial tension was derived according to the material’s compounding rule. By sorting the experimental data and comparing it with theoretical values, we could prove the accuracy of the model.
Highlights
Wu Zhi-shen and Wu Gang proposed a new composite material
steel fiber composite bars (SFCBs) co mbine the advantages of FRP and steel bars: the role of s teel bars in the initial stage SFCBs will be guaranteed to have a higher elastic modulus; FRP is linear elastic, and t he steel bar is elastoplastic
The stress-strain curve of the inner core steel bar in S BFCBs was simulated by the double-fold ideal elastic-pl astic model, and the stress-strain curve of BFRP was sim ulated by the complete linear elastic model, as shown inf igure 2
Summary
Wu Zhi-shen and Wu Gang proposed a new composite material. Its inner core is ordinary steel bars and the oute r cover is steel fiber composite bars (SFCBs). FRP continues to function aft er the steel bar yields, and the stress-strain relationship o f SFCBs at this stage has obvious secondary stiffness[1]. Gu Xing-yu and Shen Xin studied the mechanical prope rties of high modulus basalt fiber-steel wire composite b ars, analyzed the mechanical mechanism of basalt fiber-s teel wire composite bars, and concluded that the stress-st rain relationship curve of basalt fiber-steel wire composit e bars has double Linear feature[2]. The disadvantages are mai nly reflected in low elastic modulus and poor ductility; t he main advantages of steel bars are high elastic modulu s and good ductility, so we can combine the two to get a new materials with good comprehensive properties such as high strength, high elastic modulus, and corrosion resi stance[4,5,6,7]. In order to study the mechanical properties of SBFCBs, this paper conducted unidirectional tensile t ests on 3 different types of SBFCBs, and derived the stre ss-strain constitutive model of SBFCBs
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