Numerical simul tion of droplet impact erosion : dang van fatigue approach
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/190532
Tipus de documentText en actes de congrés
Data publicació2017
EditorCIMNE
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
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Abstract
The aim of this work is to understand the erosion mechanism caused by repeated
water droplets impingement on a metallic structure, and then perform numerical simulations of the
damage. When a high velocity water droplet with small diameter impacts a rigid surface,
interaction is driven by inertial effects. Upon impact, the “water-hammer” pressure appears by
inertial effect at the center of the contact though the maximum pressure occurs on the envelope of
the contact area. Lateral jetting occurs by compression when the wave front travelling inside
droplet overtakes the contact area. Concerning the structure, erosion is due to fatigue crack-
ing. First, material grains are weakened during an “incubation” phase. After a large number of
impacts, micro-cracks emerge and lead to ejection or fracture of grains, what is called “am-
plification” phase. Numerical simulation including rigid solid allows to locate the most loaded
zones of the area, by observing the pressure and mainly the impulse. A 2-way coupling compu- tation
with fluid-structure interaction at macroscopic scale allows to confirm the fatigue-based mechanism
by observing the hydrostatic stress. Finally, erosion program developed with Dang Van criterion
provides the location of the most eroded zones of the structure during a loading cycle. They
locate at the edge of jetting zone, which shows the influence of microjets in the
erosion mechanism.
ISBN978-84-946909-2-1
Fitxers | Descripció | Mida | Format | Visualitza |
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Coupled-2017-37 ... simulation of droplet.pdf | 3,089Mb | Visualitza/Obre |