What does the plastic track and field site force reduction test method do?

In plastic track and field facilities, force reduction testing—also known as rebound testing—is conducted using a specialized force reduction tester. This equipment is essential for evaluating the shock-absorbing properties of the surface, ensuring it meets safety and performance standards.  To ensure accurate results, the device must meet several specific criteria: 1. The falling weight should weigh 20kg ± 0.1kg, equipped with a hard impact head that has a diameter of 20mm. 2. It must include a rigid anvil with a flat, 100mm diameter surface. 3. The spring’s elasticity should be between 1750 and 2250N/m (typically with a 95mm diameter). If the spring exceeds this range, the results need to be adjusted accordingly. 4. The guide tube should have a diameter of 1mm, and the distance between the columns must be wider than the anvil. 5. The test bench should have a diameter of 70mm, with the ball radius from the bottom set at 500mm. 6. A screw support frame is required, with precise height measurements between the force measuring stand and the frame, accurate to 0.25mm. 7. The drop height from the bottom of the weight to the top of the anvil must be precisely 55mm, with an accuracy of 0.25mm. 8. The system should include an electronic measurement device, along with an amplifier that features a very low-pass filter. It should also be capable of recording the maximum force generated during a single impact within 0.01 seconds, with an accuracy of 0.5%. The testing procedure involves dropping the 20kg mass onto the anvil from a height of 55mm. The force is then transmitted through a spring plate to the spherical base's measuring instrument, which is equipped with a sensor. This sensor records the peak force experienced during the impact. In track and field applications, the force value (Fs) measured on the plastic surface is compared to the force value (Fc) measured on a concrete floor. The formula used to calculate force reduction is: **Force Reduction (%) = (1 - Fs/Fc) × 100** When testing under air temperatures ranging from 10°C to 40°C, plastic track and field surfaces typically show a ground force reduction between 35% and 50%, indicating their effectiveness in absorbing impact and reducing injury risk.

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