PLA TESTING
DATA
DATA COLLECTION
This chart holds the data collected from the charpy impact test. One test specimen was used for each week. The results are measured in kilojoules per meter squared.
DATA INTERPRETATION
This graph shows a gradual increase in energy absorbed as the amount of water exposure increases. This means the sample demanded more force to be broken as the amount of time exposed to water increased. The relationship is a positive trend but does not seem to be constant.
TESTING VIDEO
This video shows the pendulum hitting the sample within the machine.
DESIGNED CHARPY SAMPLE
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Using the Autodesk Fusion 360, a sample was created and oriented on the print bed. Using the software and a n Ultimaker 2 +, the smaple was then 3D printed. The specimen specifications are 124.9 x 20.0 x 6.0 mm.
TESTED SAMPLES
These specimens are pictured after testing. The non-elastic material broke on impact shown by the crack. The 5 samples ranged from a baseline, one week, two weeks, four weeks, eight weeks submerged in water. Each were tested one time. This machine was located in the APC lab and tested with the help of Johnathon Francis
EQUIPMENT USED
The Galdabini digital pendulum impact 25 tester was used to test the specimens.
A Charpy Impact test determines the relative toughness of a material. The machine strikes a specimen held firmly at each end with a hammer. By measuring the decrease in motion of the pendulum arm, the energy absorbed by the specimen is found.
