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. ![Buffer performance test equipment](http://i.bosscdn.com/blog/20/15/03/13358131220151003.jpg) The device must adhere to strict specifications to ensure accurate and reliable results: 1. The falling weight must weigh 20kg ± 0.1kg, with a rigid impact head having a diameter of 20mm. 2. A hard anvil is required, with a flat surface of 100mm in diameter. 3. The spring stiffness should be within the range of 1750 to 2250N/m (typically with a 95mm diameter). If the spring stiffness exceeds this range, the results need to be adjusted accordingly. 4. The guide tube has a diameter of 1mm, and the distance between the columns must be greater than the anvil's diameter. 5. The test bench has a diameter of 70mm, and the radius from the ball to the bottom is 500mm. 6. A screw support frame is necessary, 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 accurate to 0.25mm, and the standard drop height is 55mm. 8. The system should include an electronic measurement device 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%. During the test, a 20kg mass is dropped onto the anvil from a height of 55mm. The force is transmitted through a spring plate to a spherical base equipped with a sensor. This sensor records the peak force experienced during the impact. In track and field applications, the force value (Fs) is measured and compared to the force value (Fc) on a concrete surface. The force reduction percentage is calculated using the formula: **Force Reduction (%) = (1 - Fs/Fc) × 100** When testing is performed at air temperatures between 10°C and 40°C, plastic track and field surfaces typically exhibit a ground force reduction of 35% to 50%, indicating their ability to effectively absorb and reduce impact forces, enhancing athlete safety and comfort.

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