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The pin bursting method and elastic diaphragm method are commonly used test methods for bursting strength testers. The R&D technical engineer of Standard Group describes the test principles of these two test methods in this article.

Pin bursting method:

The pin bursting strength tester uses a pair of brackets to replace the upper and lower clamps of the electronic fabric strength tester. The upper bracket and the lower bracket can move relatively to fix the sample in the cloth clamping ring.

When the lower bracket descends at a certain speed, the pin on the push rod pushes vertically to the sample until the sample bursts. The instrument automatically displays the bursting strength and bursting elongation values.

Elastic diaphragm method:

A certain area of fabric sample is placed between the pressure cover and the air pressure box. A rubber pad (elastic diaphragm) of appropriate thickness and good toughness is placed under the sample, and it is clamped with a ring clamp of specified size.

Open the liquid inlet switch and increase the fluid pressure gently under the diaphragm until the sample ruptures.

Read the bursting strength value from the hydraulic gauge and read the bursting elongation of the sample on the extensometer when it bursts.

Test operation:

1. Ball bursting method

①. Preheat the machine for 30 minutes, and select the bursting function in the reset state. Set the margin and positioning displacement (margin is the distance from the outer circle of the push rod to the inner circle of the clamp, and positioning displacement is to collect the strength value at the set elongation, for geotextile).

②. Press the "experiment" key, put the sample into the cloth clamping ring and tighten it, and then put it flat on the cloth clamp (push the cloth clamp to the bottom).

③. Press the "stretch" key to start the test. After the sample is completely burst, the lower clamp automatically returns to the initial position, and the display screen displays various data.

④. Repeat the above steps to measure 5 samples. If the sample is not clamped tightly, it will slip out of the ring, or the sample's bursting deformation is too large, and the sample will not burst. At this time, the test result is invalid, and another sample should be replaced for retesting.

⑤. After the test is completely completed, the instrument automatically records and counts all data.

⑥. Clear the data and prepare for the next test.

2. Elastic diaphragm method

A. Check and calibrate the instrument: Check whether all parts of the instrument are normal; if necessary, the comprehensive performance of the instrument can be verified with a standard diaphragm; the elastic diaphragm must be replaced when it is significantly deformed (in the absence of a sample, expand the diaphragm to a certain height and observe the shape of the diaphragm. If there is a significant difference from the normal spherical crown shape, the diaphragm should be replaced).

B. Clamp the sample: Cover the sample on the diaphragm in a flat and tension-free state, and then clamp the sample with a ring clamp. Prevent the sample from being damaged by the clamp when pressurizing.

C. Preliminary test: Before the test, two additional pre-test samples should be used for preliminary testing to observe whether the rupture is completed within the specified time range (30s±10s for general fabrics and 15s±10s for wool fabrics) under the action of gradually increasing hydraulic pressure. If not, the pressurization rate can be adjusted to make the average bursting time within the specified range.

D. Formal test: Test the samples one by one with the adjusted pressurization rate, and record their bursting strength and bursting expansion. If the sample breaks at the edge of the clamp ring, another sample should be taken and redone.

E. Diaphragm correction number: Use the same liquid velocity as the above test, clamp the diaphragm with a clamp without a sample, and the pressure required to expand the diaphragm to the average burst expansion of the above sample is the diaphragm correction number.

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