Plastic track and field facilities require vertical deformation testing, which is typically performed using a specialized vertical deformation tester. As shown in the image below, this equipment is essential for assessing the performance and durability of the surface under impact.

Vertical Deformation Testing Equipment

The device must meet several strict specifications to ensure accurate and reliable results:

  1. The falling weight should weigh exactly 20kg, with an allowable error of ±0.5kg.
  2. The spring must have an elongation range between 30 and 40N/cm.
  3. The diameter of the test platform's base should be 70mm.
  4. The distance from the brace to the center of the support must be at least 200mm.
  5. The distance between the bottom of the weight and the top of the spring needs to be adjustable with an accuracy of less than 1mm.
  6. An electric lifting mechanism is required, along with an amplifier that ensures precision down to 0.01mm.
  7. Power deformation sensors must be installed on both sides of the test bench, each equipped with an amplifier for high-accuracy measurements (0.01mm resolution).
  8. The data recording system must be capable of storing information from both sensors, processing the data, or displaying real-time readings—approximately 50 readings per test shot.

The testing process involves dropping the 20kg weight onto the spring, which then transfers the impact force to the lower test platform. This platform is fitted with sensors that capture the changes in force during the impact. The deformation of the ground is measured by the sensors located on either side of the platform, providing precise readings of the vertical deformation.

Under normal operating conditions, the vertical deformation value typically ranges from 0.6 to 1.8mm when the temperature is between 10°C and 40°C. This range ensures that the material performs consistently across a wide variety of environmental conditions, making it suitable for use in outdoor sports facilities.

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