Precautions for plastic tensile testing machine when doing plastic test

The plastic tensile tester applies a special test of force stretching, bending, compression or shear on the sample plate according to the direction of the strain induced in the sample and the speed of the applied force. The basic test is performed by a standard plastic tensile tester. 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 required over a long period of time on a servo oil pressure electronic tension machine with a lower load.

Early plastic tensile testing machines have pointers and chart recorders. They are now completely replaced by CNC and computer software. The new controller can automatically test and display the corresponding data, and even the stress-strain curve can be displayed instantly during the test. Reduced the workload calculated by the experimenter.

Plastic tensile testing machine for plastic testing so far is common tensile strength and modulus, bending strength and modulus. For the tensile tests specified in AST*D638 and ISO527, the ends of the specimen 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 two supports on the fixed base of the test machine for bending tests (AST*D790, D6272 and ISO178). For this test, the direction of motion of the beam is opposite to that 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.

How the sample remains at the bottom of the instrument is important because different types of tests require different fixtures. Replacing the fixture is not only difficult to maintain the consistency of the position (which often affects the test results), but also easy to damage the delicate part - the sensor, the test of the strength of the experimenter, many women are difficult to complete the work. Moreover, the price of the fixture is several hundred yuan, and the fixture for hydraulic operation is as expensive as several thousand yuan. So, change the fixture as little as possible. Some electronic tensile testing machine three-point bending fixture and stretching fixture design together, reducing the process of replacing the fixture. The electronic tensile testing machine consists of one (single arm) or two (door) vertical bearing columns. Mounted on a fixed horizontal base with a moving 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 plastic tensile testing 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 tensile testing machines have interchangeable sensors that match the material to be tested.

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