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为探究煤岩在动态拉伸载荷下的力学特性,基于ABAQUS显示算法,建立了分离式霍普金森拉杆(SHTB)实验系统模型,选用并改进了朱-王-唐(Z-W-T)本构模型,对煤岩在高应变率下的应力应变关系进行研究。结果表明:数值模拟建立SHTB的实验系统能够实现恒应变率加载,改进后的煤岩本构模型能够较好地符合其在动载荷下的力学行为,煤岩在动态拉伸载荷下表现出了明显的应变率和应变硬化效应。
In order to explore the mechanical properties of coal under dynamic tensile load, the experimental Hopkinson Bar (SHTB) experimental system model was established based on the ABAQUS display algorithm, the ZWT constitutive model was selected and improved, The relationship between stress and strain of coal and rock under high strain rate is studied. The results show that the experimental system of SHTB by numerical simulation can achieve constant strain rate loading, and the improved coal-rock constitutive model can well meet its mechanical behavior under dynamic load. The coal rock shows dynamic tensile load Obvious strain rate and strain hardening effect.