Tensile Impact Test
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ASTM D1822
Click on the picture for a larger view
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Scope:
The tensile impact test measures the amount of force needed to break a specimen under a high speed tensile load introduced through a swinging pendulum.
Test Procedure:
The thickness and width of the test specimen is recorded. The specimen is then clamped to the crosshead and placed into the pendulum. The pendulum is released and allowed to strike the anvil breaking the specimen. The tensile impact energy is recorded and then corrected impact energy is calculated.
Specimen size:
There are two types of test specimens which can be used, long (L) and short (S). Both are 63.5mm (2.5") long, but gauge length areas vary. Type L specimens, with a gauge length of 9.53mm (0.375") provide a greater differentiation between materials. Type S specimens, which have no true gauge length (see the picture above) provide a greater occurrence of brittle failures.
Data:
Tensile impact energy is recorded from the apparatus. Corrected tensile impact energy is calculated as scale reading of energy minus a friction correction plus the bounce correction factor. All measurements are in ft-lbs/in2.
Equipment Used:
TMI Impact Tester
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