Working Principle of Sponge Foam Indentation Hardness Testing Machine

Working principle of sponge foam indentation hardness testing machine

Use scope of sponge foam drop ball test rebound tester:
The foam rebound tester sponge is specially designed for testing sponge, foam, rubber and other soft materials. . Economical optical instrument. Mainly lay the steel ball loosely on the sample of flexible plastic foam or other elastic material. A rebound height measuring instrument is mainly used to measure the rebound performance (rebound coefficient) in polyurethane elastic material testing projects. Referring to the National Standard of the People\'s Republic of China 6670-96 \"Determination of Resilience Performance of Soft Foam Plastics\", we designed the QX-900 series of rebound coefficient measuring instruments. The instrument uses photoelectric technology, theelectromagnetic control and a digital tube to display the measured value. It has the characteristics of accurate measurement, good repeatability, convenient use and beautiful appearance. It adopts two methods of visual inspection and instrumental testing, which not only increases the credibility of the instrument, but also facilitates the user\'s comparative use. This is an accurate measurement of flexible plastic foams. The resilient properties of isoelastomeric materials reduce human error and visual fatigue and provide a convenient instrument measurement method.

Working principle of sponge foam indentation hardness testing machine
Sponge foam indentation hardness testing machine is used for tensile, compression testing , bending and low cycle fatigue of metals, non-metals and polymer materials, etc. and other starstest items.

Measuring principle of sponge foam indentation hardness test:
Place the sample between the upper and lower pressure plates, and the upper plate compresses the sample by one certain size down at a specified speed up to national standard When the concavity specified by method A (method B, method C) iIf necessary, the load cell will return the detected pressure to the computer for processing and display, thereby measuring the indentation hardness of materials such as sponges and foams. .

Software usage instructions:
Pre-concave degree:
Apply 5N force to the sample to measure the thickness of the sample and press 70 % of the thickness of the sample at a speed of 100MM/MIN Then, unload at the same rate
Method A - Determination of the hardness index by indentation:
After three pre-pressures, indent thicknessof the sample by 40% and hold it for 30S, record the force value
Method B ---Measurement of concave hardness characteristics:
After three pre-pressures, concave the thickness of the sample to 25% and keep it for 30S, record the force value
Increase the degree of concavity from 25% of the sample thickness concave to 40% and keep it for 30S , record the force value
Increase the concavity by 40% of the thickness of the concaveAve specimen to 65% and keep it for 30S, record the force value
Calculation of the concavity coefficient :
Concave force value required for 25% penetration/force required for 40% concavity
Force value required for 65% concavity/force required for 40% concavity
Method C --- Indentation hardness test and measurement:
After three pre-concavity tests, measure the instantaneous maximum value after pressing in 40% ofthe sample thickness
Method D --- freely define the test method:
You can test according to your own requirements, this test method is defined according to foreign standards. For example, the following test is required: 5 times of compression are required
1. For the first time, compress to 30% of the original thickness at a speed of 150 mm/min, and return to the \'initial state.
　2. After a pause of 5 seconds, compress to 40% of the original thickness at a speed of 90mm/min and return to the initial state.
　3. After a pause of 3 seconds, compress to 75% of the original thickness at a speed of 300 mm/min and return to the initial state.
4. After pausing for 1 second, compress to 50% of the original thickness at a speed of 75mm/min and return to the initial state.
5. After a pause of 2 seconds, compress to 40% of the original thickness at a speed of 50mm/min, and return to the initial state.

CharacteristicProduct features:
1. The indentation amount is preset, and the indentation amount is precisely controlled by a timing circuit;
2. Easy to use: using high pressure sensors of precision and large-scale integrated circuit;
3. Test method: In addition to the test method stipulated in the national standard, the test method can also be set freely;
4. Platen speed : The default speed is 100 mm/min; Adjust the operating speed;
5. Transmission mechanism: precision ball screw, no noise in measurement;
6. Thickness measurement: can automatically calculate and display the thickness of the material.e sponge tested;
7. Curve display: Test time, pressure and indentation depth curves can be simultaneously displayed and retrieved;
8. Data retrieval: place the mouse at any point on thecurve, and the time, pressure and indentation depth can be displayed in real time; 9. Data storage: you can save the data of each experiment, and you can also save the set test method ;
10. Test process: real-time display of the test process;
12. Overload: Automatic shutdown when the load exceeds the rated value.

Learn more about: Sponge Foam Indentation Hardness Tester

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