High Speed Puncture Multiaxial Impact
(Dynatup Impact)
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ASTM D3763
ISO 6603, ISO 7765
A2LA Accredited
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Scope:
The High Speed Impact test is used to determine toughness, load-deflection curves and total energy absorption of impact events. Since speed can be varied, it can simulate actual impact values at high-speeds. This sophisticated impact test provides full force and energy curves during the mili-seconds of the impact, using a "Tup" which incorporates an impact head and a load cell. The data is often used to specify appropriate materials for applications involving impact. The test is also used to evaluate the effect of secondary finishing operations or other environmental factors on plastic impact properties.
Since many materials (especially thermoplastics) exhibit lower impact strength at reduced temperatures, it is sometimes appropriate to test materials at temperatures that simulate the intended end use environment.
Test Procedure:
The specimen is clamped onto the testing platform. The crosshead, with the attached Tup, is raised to the appropriate height and is released so it impacts at a specified speed. A load-deflection curve is produced.
Reduced Temperature Test Procedure:
The specimens are conditioned at the specified temperature in a freezer until they reach equilibrium. The specimens are quickly removed, one at a time, from the freezer, clamped onto the testing platform, and the crosshead is released to impact the specimen. ASTM and ISO do not specify a conditioning time or elapsed time from freezer to impact - typical values from other specifications are 6 hours of conditioning and 5 seconds from freezer to impact.
Specimen size:
Any size or shape that will fit into the impact tester. Generally 4" x 4" plaques or 4" diameter disks, although actual parts may also be tested.
Data:
A load-deflection curve is produced. Numerous data values related to toughness and total energy are calculated including maximum force, energy at maximum force and total energy to break.
Equipment Used:
Dynatup High Speed Impact Tester
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