Does a stone sinking in ocean get crushed?!
Does a stone sinking in ocean get crushed?!
(OP)
assume u have a thin walled steel cylinder (1 m Dia and 10 m length for example). it is anchored to the seabed. if the water depth in the location is 2000 m, the cylinder will probably be crushed by hydrostatic pressure.
now assume you let a stone submerge in an ocean with infinite depth. the stone will sink and theoritically it should be crushed upon reaching a certain depth...?
but i FEEL it wont!
does it really sink infinitely or get crushed at a certain depth?
any answers?
now assume you let a stone submerge in an ocean with infinite depth. the stone will sink and theoritically it should be crushed upon reaching a certain depth...?
but i FEEL it wont!
does it really sink infinitely or get crushed at a certain depth?
any answers?





RE: Does a stone sinking in ocean get crushed?!
It's not the total stress that causes a material failure, it's the shear stress, caused by difference between principal stresses. Mohr's circle helps explain that.
RE: Does a stone sinking in ocean get crushed?!
RE: Does a stone sinking in ocean get crushed?!
RE: Does a stone sinking in ocean get crushed?!
You have figured out that anything can be crushed under sufficient pressure, that's correct. The water won't have however, sufficient pressure ever to crush an object like a rock, no matter what the density or porosity of the rock could be (the air trapped inside the rock will continuously shrink under the water pressure, until it will reach the rock's density). So the rock will sink indefinitely, to the bottom end of the water (ocean?). However, the soil pressure on the rock (few kilometers of depth) will exceed the resistance of the rock and the energy of that pressure will melt the rock turning it into lava.
By the way, the story of the cylinder crushed under water doesn't work, there are many submarines contradicting the theory...at depths of more than 5000 or 6000 m.
cheers,
gr2vessels
RE: Does a stone sinking in ocean get crushed?!
The crushing strength again depends on several factors such as porosity (water fill) and shape.
The best examples are the lava and fine seabed soil.
Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit www.narendranath.itgo.com.
RE: Does a stone sinking in ocean get crushed?!
RE: Does a stone sinking in ocean get crushed?!
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