Testing apparatus for determining tensile strength of soil and rock

摘要

A testing apparatus includes a control panel 138; a stationary fracturing rod 118 and an active fracturing rod 122 movable relative to the stationary rod; a sample positioning frame 144 with operating arm to position and center the sample 120 so that the two rods and center axis of the sample are aligned in the same vertical plane; a stepper driver 130 to control a stepper motor 134, the stepper motor further drives an electric cylinder 136; the electric cylinder forcibly urges the active rod towards the stationary rod to fracture the sample. A load cell 142, displacement sensor 140, and data processor are provided to collect pressure and displacement data, the processor calculates the tensile strength and generates a pressure-displacement curve for display on a display screen 112. Calculation of the tensile strength is based on a tensile strength constant, sample size correction coefficient, a maximum pressure, a mathematical constant, sample diameter and height, and a fracturing rod correction coefficient.