General > General Technical Chat
Berlin AquaDom explosion - what went wrong?
tom66:
The slides linked in a prior post indicate pedestrian scratches and impacts are just something that has to be accounted for in the design, but it's amazing how little damage is needed to weaken the structure. The indication (chart on slide 27) is that the entire material strength is reduced by around 5x for a 2.5mm deep scratch, which seems utterly mad to me, but material physics is weird. I am not sure whether this is just for the 'wet' side (with the greatest pressure) or if any part of the material could be susceptible.
AVGresponding:
--- Quote from: tom66 on December 19, 2022, 06:03:35 pm ---The slides linked in a prior post indicate pedestrian scratches and impacts are just something that has to be accounted for in the design, but it's amazing how little damage is needed to weaken the structure. The indication (chart on slide 27) is that the entire material strength is reduced by around 5x for a 2.5mm deep scratch, which seems utterly mad to me, but material physics is weird. I am not sure whether this is just for the 'wet' side (with the greatest pressure) or if any part of the material could be susceptible.
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The dry side would be the critical one in this case, as it's under tension, while the wet side is under compression.
ebastler:
--- Quote from: tooki on December 19, 2022, 05:54:49 pm ---FYI to our German-speaking friends, in English, “folie” translates to “film” for plastics, while “foil” is for metals. We never say “plastic foil”, while “metal film” is possible, but then means a thin layer on some substrate (i.e. “Metallbeschichtung”).
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Aha, thank you! I have used "foil" in various contexts, and it always felt wrong. But "film" didn't come to mind, although I must have read it many times -- and I never realized that English uses different words depending on the material. Learnt something new today! :)
pcprogrammer:
--- Quote from: AndyBeez on December 19, 2022, 05:27:38 pm ---... so what was updated? ...
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In the article eblaster provided, they state that near the base it was leaking water and needed attention. They replaced the silicone seal between the concrete base and the acrylic cylinders.
--- Quote ---With a million liters of water, i.e. a weight of 1,000 tons, there is enormous pressure at the bottom of the aquarium, which is made more difficult by the salt content of the water of 3.5 percent. After 15 years of continuous operation, a certain amount of material fatigue is completely normal. In the lower area, slight leaks actually formed and moisture escaped. So there was a need for action.
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rf-messkopf:
--- Quote from: tom66 on December 19, 2022, 06:03:35 pm ---The slides linked in a prior post indicate pedestrian scratches and impacts are just something that has to be accounted for in the design, but it's amazing how little damage is needed to weaken the structure. The indication (chart on slide 27) is that the entire material strength is reduced by around 5x for a 2.5mm deep scratch, which seems utterly mad to me, but material physics is weird. I am not sure whether this is just for the 'wet' side (with the greatest pressure) or if any part of the material could be susceptible.
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On German TV a guy from Deutsches Meeresmuseum Stralsund was interviewed who said that in large aquariums it is general practice to regularly check polymer panes for scratches from visitors, and to polish them out as soon as possible. Happens easily when people scrape their backpacks along the pane.
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