Test temperature: The temperature of the laboratory for impact testing should generally be within the range of 10~35℃ (that is, the room temperature). For tests with strict requirements, such as the impact test of materials whose toughness is sensitive to temperature changes, the test should be Perform at 20°C ± 2°C. Sample size: Use a measuring tool with a small division value not greater than 0.02mm to measure the width, thickness, and thickness of the notch; use an optical projector to check the notch size to see if it meets the requirements of the standard.
Carry out a runaway test: raise the pendulum to the pre-raise angle position, move the driven pointer to the position of high impact energy (if a digital display device is used, it should be cleared), release the pendulum, and read the value near the zero point The indication value of the passive pointer (that is, zero deviation), the zero deviation should not exceed 1/4 of the small graduation value.
The sample should be placed close to the support with the back of the sample notch facing the pendulum blade. The notch of the specimen is centered with a special centering clamp or positioning gauge, so that the symmetry plane of the notch is on the symmetry plane of the two supports, and the deviation should not be greater than 0.5mm.
Raise the pendulum to the pre-raising angle position and lock it, move the driven pointer to the position of high impact energy (if a digital display device is used, clear it), place the sample, and confirm that there is no danger zone for pendulum swing After the person, release the pendulum to drop it to interrupt the specimen, and allow it to continue to swing forward until it reaches the high point and swings back to the low point, use the brake to brake the pendulum to stop it in a vertical position In a stable position, read the value pointed by the passive pointer on the indicating scale (the display value of the digital display device), this value is the impact absorption energy
