working principle of universal testing machine

working principle of universal testing machine

Normally, universal testing machines have a moveable struture which can vertically move up and down to realize both tensional and compressional tests.
Tensional tests include tensile, tear and peel tests
Compressional tests include compressive, shearing, bending and flexural tests
Universal testing machines can be classified into two categories daccording to their driving methods: servo-hydraulic drive and electromechanical drive.
Servo-hydraulic: it has a tensile structure mounted on a oil cylinder which is used to drive the tensile structure up and down, and the oil feeding rate to oil cylinder is controlled by a servo valve. such as HUALONG servo-hydraulic universal testing machine
Electromechanical: it has two screws and a moveable crossbeam, the crossbeam could move up and down to achive tensile and compressional tests, a servo motor which is contrlled by a servo drive to drive the crossbeam up and down.

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