Explain how to use rubber tensile testing machine HD-605A:
The rubber tensile testing machine can mainly measure the tensile force, tearing, peeling, adhesive force of various materials ... resistance physical properties. The test date, time and display value set by the display can be printed out. This machine can be equipped with various fixtures and elongation test devices, or assembled according to customer needs.
Design standards: ASTM D903, GB / T16491, GB / T1040, GB / T8808, GB13022, GB / T 2790/2791/2792, CNS-11888, JIS K6854, PSTC-7
Main technical parameters of rubber tensile testing machine:
Capacity: 5, 10, 20, 25, 50, 100, 200kg (optional)
Unit switching: G, kg, N, LB
Load resolution: 1 / 100,000
Load accuracy: ≤0.5%
Maximum stroke: 600 ~ 800mm (can be customized according to customer requirements)
Test speed: 50-300mm / min (knob type adjustable speed)
Display device: LCD display (can display and print test times, test values, maximum value, breaking value, etc.), can be connected to a PC computer operation Dimensions: (L × W × H) 500 × 440 × 1500mm
Weight: 75kg
Power supply: 1∮, 220V, 3A
Distribution: a set of tension fixture
Guidance on the practical use range of rubber tensile testing machine test
The specified non-proportional extension strength Rp in the tensile machine test method is often expressed by Rp0.2. Generally, the reference standard of Rp0.2 can be used to determine Rp0.01, Rp0.05, and Rp0.1, so we take Rp0.2 as an example.
Measure Rp0.2 graphically and accurately draw the force-elongation curve (or stress-elongation curve). The tension machine produced by our company has a high degree of automation and can accurately draw the curve required by the graphic method. The national standard stipulates: the linear elastic metal material uses the conventional push E parallel line method, and the elastic straight line portion of the curve is the reference line; for metal materials that do not have obvious elastic straight line segments, because there is no obvious elastic straight line segment, the hysteresis loop method is also recommended. A stepwise approximation method can be used, and the standard referenced when passing the tensile machine test is: GB / T 228-2002.
When implementing the hysteresis loop method, the hysteresis loop should be drawn. The new standard emphasizes that the expected non-proportional extension strength should be exceeded and then the force should be reduced. However, the actual expected value selected in actual operation is difficult to be close to the actual Rp0.2, often resulting in a positional relationship between the two situations .
1. When the unloading point exceeds the actual Rp0.2, the connection line is on the right of the parallel line, and the parallel line of the end point of the hysteresis loop intersects the force-extension curve before the unloading. It can be used for arbitration test at this time, but the unloading point should not be too late. Therefore, on the tension machine, it must be ensured that the connection line is located on the right side of the parallel line, that is, to solve the control problem of the unloading point. Please contact us for more tensile machine test methods.
2. The unloading point is lower than the actual Rp0.2 and is unloaded ahead of time. The connection line of the end point of the hysteresis loop on the tension machine software is located on the left side of the parallel line. At this time, a large amount of estimated stress and elongation are required, which is not feasible on the tension machine. .
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