In plastic track and field venues, force reduction testing (rebound detection) is performed using a force reduction tester.
This device must meet the following requirements:
1. The weight of falling weight is 20kg ± 0.1kg, with a hard impact head (diameter of 20mm);
2. With a hard anvil, flat diameter of 100mm;
3. The spring elasticity is between 1750 and 2250N/m (usually 95mm in diameter). If the spring elasticity exceeds this value, the result must be corrected;
4. The guide tube diameter is 1mm, the distance between the columns is greater than the anvil;
5. The diameter of the test bench is 70mm, and the radius of the ball to the bottom is 500mm;
6. With a screw support frame, the height between the force measuring stand and the support frame, the required accuracy to 0.25mm;
7. The drop height between the bottom of the weight and the top of the anvil is required to be accurate to 0.25mm, and the drop height is 55mm;
8. With electronic metering device, should be equipped with an amplifier, the amplifier should be equipped with a very low filter filter, and can record the maximum force generated by a single shock in 0.01s time, the accuracy is 0.5%.
The test method was to place a mass weighing 20kg on a anvil from a height of 55mm, passing the force through a spring plate to the measuring instrument of a spherical base, the measuring instrument equipped with a sensor, which records the highest value of the force, In the track and field field, the force value (Fs) is measured and compared with the measured force value (Fc) on the concrete floor.
Reduction of force (%) = (1-Fs/Fc) X100
When 10 to 40. c When testing between air temperatures, plastic track and field venues have a ground force reduction of 35% to 50%.
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