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用三种不同的位移测量仪器,两套独立的记录装置,证明了目前人们对粘滑瞬态过程的认识是值得重新考虑的。如果用安装在容器外部的电感位移传感器来测量粘滑时的裂纹位移,则粘滑瞬态过程的应力—位移曲线呈“L”型,与人们的认识相一致。但如用安装在容器内部的应变片位移计来测量裂纹位移,则瞬态过程的应力—位移曲线呈斜直线下降。作者认为后者更能反映粘滑过程的本质。造成不同图形的主要原因是不稳定性开始时,应力和位移是否同时变化,以前实验中记录到的“不同时”是测量位移的仪器时间滞后所造成的,而滞后的原因又是传感器的原理和安放的位置不同所引起的。
With three different displacement measuring instruments and two independent recording devices, it is proved that people’s understanding of stick-slip transient process is worth reconsidering. It is well-established that the stress-displacement curve of the stick-slip transient is “L” if the displacement of the stick-slip crack is measured with an inductive displacement sensor mounted on the outside of the vessel. However, if the strain gauge displacement meter installed inside the container is used to measure the crack displacement, the stress-displacement curve of the transient process drops obliquely. The author thinks the latter can better reflect the essence of stick-slip process. The main reason for the different graphics is the beginning of instability, stress and displacement at the same time changes in the previous experiment recorded “not at the same time” is measuring the displacement of the instrument caused by the time lag, and the reason behind the sensor principle And placed in a different location caused.