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 crucial for evaluating the shock absorption capabilities of the surface, ensuring it meets safety and performance standards.  The device must adhere to strict specifications to ensure accurate and reliable results. First, the falling weight should weigh 20kg ± 0.1kg, equipped with a hard impact head that has a diameter of 20mm. The anvil used in the test must be flat and have a diameter of 100mm to provide a consistent contact surface. The spring system must have an elasticity between 1750 and 2250N/m, typically with a diameter of 95mm. If the spring's elasticity exceeds this range, the results need to be adjusted accordingly. The guide tube should have a diameter of 1mm, and the distance between the columns must be greater than the anvil’s diameter to prevent any interference during the drop. The test bench should have a diameter of 70mm, and the radius from the ball to the bottom should be 500mm. A screw support frame is required to maintain precise alignment between the force measuring stand and the frame, with a height accuracy of 0.25mm. The drop height, measured from the bottom of the weight to the top of the anvil, must also be accurate to 0.25mm, with a standard drop height of 55mm. The system must include an electronic measuring device with an amplifier that features a very low-pass filter. This setup allows the system to capture the maximum force generated by a single impact within 0.01 seconds, with an overall accuracy of 0.5%. During the test, a 20kg mass is dropped from a height of 55mm onto the anvil, transmitting the force through a spring plate to a spherical base equipped with a sensor. The sensor records the peak force experienced during the impact. In track and field applications, this force value (Fs) is compared to the force measured on a concrete floor (Fc). The force reduction percentage is calculated as: **Force Reduction (%) = (1 - Fs/Fc) × 100** When testing under air temperatures ranging from 10°C to 40°C, plastic track and field surfaces typically exhibit a ground force reduction between 35% and 50%, indicating their effectiveness in absorbing impact and reducing injury risk.

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