滞回曲线对应力振幅和频率的响应

摘要

The responses of hysteresis loops to stress amplitude and frequency are studied in this paper based on the influences of fatigue loading on stress-strain curves. The results show that as the loading exceeds the yield point, the strain amplitude augments and the hysteresis curves tend to be steady, besides, the strain hardening effect is also strengthened. When the frequencies of the sine waves increase, the frequency dispersion of the hysteresis loops of the rocks is strengthened. This effect is also intensified with the saturation fluids. The frequency dispersion effect will become more obvious when the coefficients of viscosity of pore fluids increase.%基于疲劳载荷对应力～应变滞回曲线的影响，作者研究了滞回曲线对应力振幅和频率的响应，获得了载荷超过屈服点后应力振幅增大，滞回曲线趋于稳定，应变硬化效应增强的结果。随着正弦波频率增加岩石的滞回圈频散效应增强，饱和液体加强了这种频散作用。随孔隙液体的粘滞系数增大，滞回曲线的频散效应更强。