Measuring and testing – Testing by impact or shock – Specimen impactor detail
Reexamination Certificate
2006-08-03
2008-05-20
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Testing by impact or shock
Specimen impactor detail
C073S012040, C073S012060, C073S012110, C073S012120, C073S012130, C073S078000
Reexamination Certificate
active
07373802
ABSTRACT:
A method and testing fixture for toughness-testing corrugated high density polyethylene (HDPE) pipe. The method includes the steps of preparing a test sample, attaching the test sample in the testing fixture, and providing an impact load to the test sample. The test sample is cut from a section of corrugated HDPE pipe so as to have a clamped portion and a loading member extending outwardly therefrom. The clamped portion includes two sidewalls with a trough therebetween. A hole is bored in the loading member near the end of the loading member. The testing fixture includes a vertical clamp which is configured to grip the clamped portion of the test sample so as to retain the clamped portion in a stationary position when the test sample is loaded. The loading member of the test sample projects outwardly from the vertical clamp. A guide rod is attached to the loading member through the bore in the loading member. One or more masses are slidably situated on the guide rod so that they can fall from a first position to a second position. A stop collar is attached near the second end of the guide rod to arrest the freefall of the masses, causing an impact load to be transmitted up the guide rod to the loading member.
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Langley Robert M.
Powers Rodney G.
Horton J. Wiley
Kirkland, III Freddie
Lefkowitz Edward
The State of Florida, Department of Transportation
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