Publications
| Title | | Authors |
|---|---|
| EPRG Dynamic puncture tests: a video film « back |
M Zarea, I Deo and C Philibert |
| 11th PRCI/EPRG Joint Technical Meeting, Arlington, Virginia, April 1997 | |
| In recent years, EPRG performed a large series of full scale static puncture tests, with both new end worn excavator teeth. Test results with new teeth could be well correlated by a "metal-cutting" - type of relationship between normalized puncture force and a pipe resistance parameter. The validity of this relationship had also to be tested in the rapid loading case, when an excavator impacts the pipe with significant momentum. Tlie full scale experimental checks were performed on four pipes of different diameters (219, 406, 914, and 1219 mm) (8", 16", 36", and 48"), which span the current diameter range. The test results compared well with the static puncture correlation. The dynamic puncture tests with wom teetli lie well within tlie scatterband of static puncture tests with wom teeth. This interesting result is completed with an analysis of the different inputs for the two cases : for the static case, the force developed by an excavator is given by the manufacturer, but in the case of dynamic puncture, a more detailed knowledge of the excavator arm configuration is needed in order to evaluate the available impact energy. Static and dynamic puncture criteria are compared, and we conclude the under given conditions, the static puncture criterion is representative of both loading modes. | |
| Paper request | |