玄武岩纤维混凝土的冲击力学行为及本构模型

采用Φ100mm分离式霍普金森压杆(SHPB)试验装置研究了玄武岩纤维混凝土在不同应变率下的冲击力学行为,并将其与基体混凝土进行对比分析;采用朱-王-唐(ZWT)模型,在试验研究的基础上,建立了考虑纤维三维随机分布效应的玄武岩纤维混凝土非线性粘弹性本构模型,并与SHPB试验结果进行比较。结果表明:玄武岩纤维混凝土的冲击压缩强度与能量吸收能力,较素混凝土有明显提高,具备优异的冲击力学性能;本构模型提供的理论曲线与试验曲线比较接近,改进后的ZWT模型可以较为准确地描述玄武岩纤维混凝土的高应变率力学行为。

DYNAMIC BEHAVIOR AND CONSTITUTIVE MODEL OF BASALT FIBER REINFORCED CONCRETE UNDER IMPACT LOADING

The impact behavior of basalt fiber reinforced concrete(BFRC) subjected to various high strain rates was investigated using a 100-mm-diameter split Hopkinson pressure bar(SHPB) apparatus.And it was compared with that of plain concrete.A new nonlinear viscoelastic constitutive model for BFRC was proposed and validated with experimental data.Fiber orientation effect was emphasized in the model.The experimental results show that the addition of short basalt fiber can significantly improve the impact compressive strength and energy-absorption capacity of the concrete.Comparison of model output with experimental data indicates that this nonlinear viscoelastic constitutive model is able to describe high-strain-rate mechanical behavior of BFRC reasonably.