... load frame consists of pedestal, oil cylinder, piston, wheel sensor, lifter motor, reducer, sprocket wheel, the screw-bar, ... extensometers.The piston’s displacement is measured by displacement sensor.Microcomputer printer and electronic components1. PC: Lenovo brand ... . deformation 25 mm of Beijing Steel Institute; 3. Digital displacement Sensor: Omron of Japan;Hydraulic source:1. Hydraulic station: ...