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Measuring Damage Resistance of Composite to Drop Weight Impact Event (ASTM D7136/D7136M)
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Based on the impact portion of Boeing BSS 7260 Type II, Class 2, ASTM D7136/D7136M-05, covers measuring the damage resistance of fiber reinforced polymer matrix composite plates that have been subjected to a drop-weight impact test. Five flat, rectangular specimens of each material/lay-up are to be tested. The potential energy to be used – defined as mass and drop height – is to be 4.94 ft-lb (6.7J) multiplied by the specimen thickness. Supported on a rigid support fixture with the appropriate sized window in the support base the specimen is subjected to an out of plane, concentrated impact using a hemispherical impactor/insert with a diameter of 0.625 inches (16mm). The damage resistance of the plaque is quantified in terms of the size and type of damage left in the specimen after impact thru post examination. Subsequent compression tests per ASTM D7137/D7137M-05 are conducted if required. Knowing the damage resistance properties of a laminated composite plate is useful for both product development and material selection.
When asked to offer a testing solution to this standard we recommend the use of either our Model 8200; or one of our Model 9250’s For those customers whose impact energy requirements fall between 1.0 – 97.9 ft-lbs (1.356 – 132.8 J) we recommend using the Model 8200 Drop Weight Impact System. With impact energies ranging from 1.9 – 1182 ft-lb (2.6 – 1603 J) either our Model 9250G or Model 9250HV with Impulse Data Acquisition and Machine control would be our recommendation for those composite customers who need higher impact energies.
For the testing of plaques that are less then 1 inch (2.42 mm) thick we have optional lightweight crossheads to meet those lower impact energies. To prevent a secondary impact of the falling weight onto the composite plate we employ our pneumatic rebound brake. For larger composite products we offer larger, extended support tables. To fully protect the operator from flying debris we include and offer a selection of interlocked safety enclosures.
Though the test defined in the standard calls for visual inspection and measurements after impact to determine if the specimen has failed, by including instrumentation with our Impulse Data Acquisition System and a strain gauged tup failure points/modes that may remain hidden under normal test conditions can be found. One piece of information that may not be found with out the use of instrumentation is the first crack or incipient damage point.
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