polymers-08-00196 - polymers Article Mechanical...

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polymers Article Mechanical Characterization of the Tensile Properties of Glass Fiber and Its Reinforced Polymer (GFRP) Composite under Varying Strain Rates and Temperatures Yunfu Ou 1 , Deju Zhu 1, *, Huaian Zhang 1 , Liang Huang 1, *, Yiming Yao 2 , Gaosheng Li 1 and Barzin Mobasher 2 1 College of Civil Engineering, Hunan University, Changsha 410082, China; [email protected] (Y.O.); [email protected] (H.Z.); [email protected] (G.L.) 2 School of Sustainable Engineering and Built Environment, Arizona State University, Tempe, AZ 85287, USA; [email protected] (Y.Y.); [email protected] (B.M.) * Correspondence: [email protected] (D.Z.); [email protected] (L.H.); Tel.: +86-731-8882-3861 (D.Z.); +86-135-0731-5881 (L.H.) Academic Editor: Alper Ilki Received: 26 March 2016; Accepted: 10 May 2016; Published: 19 May 2016 Abstract: Unidirectional glass fiber reinforced polymer (GFRP) is tested at four initial strain rates (25, 50, 100 and 200 s ´ 1 ) and six temperatures ( ´ 25, 0, 25, 50, 75 and 100 ˝ C) on a servo-hydraulic high-rate testing system to investigate any possible effects on their mechanical properties and failure patterns. Meanwhile, for the sake of illuminating strain rate and temperature effect mechanisms, glass yarn samples were complementally tested at four different strain rates (40, 80, 120 and 160 s ´ 1 ) and varying temperatures (25, 50, 75 and 100 ˝ C) utilizing an Instron drop-weight impact system. In addition, quasi-static properties of GFRP and glass yarn are supplemented as references. The stress–strain responses at varying strain rates and elevated temperatures are discussed. A Weibull statistics model is used to quantify the degree of variability in tensile strength and to obtain Weibull parameters for engineering applications. Keywords: polymer-matrix composites (PMCs); mechanical properties; stress/strain curves; deformation; statistics 1. Introduction Fiber reinforced polymer (FRP) composites have many merits, such as high stiffness/weight and strength/weight ratios, advanced fatigue and corrosion resistances, etc. , providing significant functional and economic benefits, ranging from strength enhancement and weight reduction to durability features. With decreasing manufacturing costs, recently, they have won the attention of engineers involved in the construction of civil structures [ 1 ]. Structural elements reinforced with FRP, however, might be subjected to dynamic loadings, such as wind loads, earthquake loads, explosions, etc. and vary temperature conditions during their service life. Under such conditions, the mechanical properties of FRP involving Young’s Modulus, tensile strength, toughness, etc. may suffer great changes [ 2 6 ]. Therefore, the investigation of the mechanical properties of FRP composites under dynamic loadings and different temperatures is essential to design the structures with this kind of materials.
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  • Fall '15
  • Strain, Tensile strength, GFRP, strain rate

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