Introduction to the test of electronic tensile testing machine

Electronic tensile machine testing refers to the process of stretching, bending, compressing or puncating plastic splines, etc., at a controlled speed until they break.

The structure of the electronic tension machine consists of one (single arm) or two (door) vertical carrier columns mounted on a fixed horizontal base with a movable horizontal beam at the top. In most of today's electronic tensile machines, the struts are usually driven by a lead screw to determine the position of the moving beam.

The specifications of the electronic tensile machine are represented by the combination of the large load of the Zui that the frame can withstand and the large load of the carrying unit. The load cell is mounted on a motor driven or hydraulically driven moving beam. The load cell connected to the fixture measures the force and can be read from a digital display or computer. Many electronic tensioners have interchangeable sensors that match the material to be tested.

In order to induce strain on the plastic, the electronic tensioner exerts a force on the template. Special tests in terms of stretching, bending, compression or shear are classified according to the direction in which the strain is induced in the template and the speed at which the force is applied. The basic test is done by a standard electromechanical electronic tension machine. They are typically loaded in the speed range of 0.1 mm/min to 500 mm/min, and different materials require different test speeds. Dynamic and cyclical tests such as rupture growth and fatigue are generally performed over a long period of time on a servo oil pressure electronic tension machine with a lower load.

The electronic tensile machine for plastic testing so far is common for tensile strength and modulus, flexural strength and modulus. For the tensile tests specified in ASTM D638 and ISO 527, the ends of the sample were clamped. One clamp is fixed and the other is in the beam, removed from the fixture, and the specimen is pulled until it breaks, and then the beam automatically stops.

The specimens were placed on the two supports on the fixed base of the test machine for bending tests (ASTMD 790, D6272 and ISO 178). For this test, the beam is moved in the opposite direction of the tensile test, pushing rather than dragging the unsupported center of the specimen until it bends and may break. In China, because many thermoplastics do not break in this test, the bending stress is calculated according to the standard test method when the deflection reaches 1.5 times of thickness. The common bending force of the sample is 4 mm for a 4 mm thick specimen.

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