Dart impact test is performed on plastic films and laminates to determine the effect of free falling dart on plastic films. The energy created by the falling dart causes the film to fail under some specified conditions. The test is widely performed by the manufacturers in plastic industries and paper & packaging industries to assess the durability and strength of the plastic films and other related products.
To perform the impact test using the Dart Impact Tester, first of all, the user need to prepare the test sample as per the standards for precise and reliable results. This includes certain steps.
As per the Standards ASTM - D 1709 - 15a, ASTM - D 3029 - 82a, IS - 2508 - 1984, to prepare the specimen to perform the Dart Impact Test efficiently using Dart tester, you need to follow certain steps:
Note: If the release mechanism is not fixed in the desired position, simply remove it from the present position and reaffix it at the desired one.
As per provided ASTM and IS standards, after choosing appropriate sample and after adjusting the height of the drop as per the standards and application requirement,
To perform the test, fix the electromagnet clamp / holder at different length of 660mm & 1524mm with the given formula:
Scale Length + Dart Length + Electro Magnet length = Reading of Scale
660mm + 212mm + 35mm = 907mm
1524mm + 226mm + 35mm = 1785mm
Formula to Calculate the Impact Resistance
Impact Resistance = M100 – D (S1/100 – 0.5)
M100 = lowest weight according to the D used at which 100% failure occurs.
D = Uniform increment weight used (in grams)
S1 = Result (Percentage Failure) – Sum of Percentage of breaks at each weight.
|Weight||No. of Test Samples Taken||Result (Percentage Failure)||Number of Samples Broken|
Impact Resistance = 150 -15(190/100 – 0.5) = 129 grams
Where, D = 15 (uniform incremental weight)
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