高温后玄武岩和玻璃纤维增强复合材料筋的力学性能

Mechanical Properties of Basalt and Glass Fiber Reinforced Polymer Tendons after Exposed to Elevated Temperatures

采用MTS万能试验机对不同温度处理后的玄武岩纤维增强复合材料(BFRP)筋和玻璃纤维增强复合材料(GFRP)筋的拉伸和剪切性能进行测试,研究了高温对BFRP筋和GFRP筋力学性能和破坏模式的影响.利用Weibull模型对不同温度处理后BFRP筋和GFRP筋的拉伸强度进行统计分析,采用热重分析仪定量化阐明BFRP筋和GFRP筋的热分解机制.结果表明:高温会导致BFRP筋和GFRP筋发生明显的颜色和形貌变化;BFRP筋和GFRP筋的拉伸强度、极限应变、韧性和剪切强度均随着温度的升高而呈先上升后下降的趋势,而弹性模量变化不明显.与相同温度处理后的GFRP筋相比,BFRP筋的拉伸性能较差,剪切性能较好;BFRP筋和GFRP筋的热分解特性解释了其高温后力学性能的退化机理.

The tensile and shear properties of basalt fiber reinforced polymer(BFRP)and glass fiber reinforced polymer(GFRP)tendons after thermal aging were tested by the universal testing machine,and the effects of elevated temperatures on the mechanical properties and failure mode of BFRP and GFRP tendons were studied.Furthermore,the tensile strengths of BFRP and GFRP tendons after treatment under various elevated temperatures were statistically analyzed by Weibull model,and the thermal degradation mechanism of BFRP and GFRP tendon was quantitatively analyzed by a thermo-gravimetric analyzer.The results show that the color and morphologies of BFRP and GFRP tendons change obviously with the elevated temperatures.The tensile strength,ultimate strain,toughness and shear strength of BFRP and GFRP tendons slightly increase firstly and then decrease with the temperature,while the elastic modulus does not change significantly.Compared with the GFRP tendon,the BFRP tendon treated under the same temperatures exhibits lower tensile properties but better shear performances.The pyrolysis characteristics of BFRP and GFRP tendons properly explain the degradation mechanism of their mechanical properties after elevated temperatures.