 |
|
|
|
|
|
|
| 05. Dezember 2000 |  | A Perturbation Analysis of RCP in Plastic Pipes |
|
ReferentInnen:
| | Professor J.G. Williams, FRS, Mechanical Engineering Department, Imperial College, London |
|
Ort:
| | EMPA, Dübendorf |
|
Inhalt:
| | Pressurised plastic pipes can sustain Rapid Crack Propagation (RCP) when sufficient pressure is applied. This is a steady state phenomena in which the crack achieves a constant speed (up to 300 m/s). Usually the crack path is straight but sometimes there is a regular, sinusoidal oscillation. Many reasons have been suggested and one is offered here.
The notion is that the initiation conditions of the crack result in the crack speed being perturbed from the steady state. An analysis of such a perturbation will be given in which the frequency and amplitude of the speed oscillation are predicted. It is proposed that if the crack moves at constant speed but with an oscillating path then the axial component is oscillating as given by the perturbation. The predictions will be compared with observations.
Leiterin EMPA Akademie
Dr. Anne Satir
|
| |
|
|
|
|
|
|
zurück
Links
Artikel versenden
Druckansicht