CAD Forum

Hi,

New to the whole Simulation thing, but trying to understand the effects of gravity on a piece of sheet metal and was under the impression that gravity put a load of 14.7psi at sea level (atmosphere pressure) on a given object yet SolidWorks simulation has a value of 386.22in/s˄2, for sh!t and giggles I ran 2 sims with each value and they came out different (deflection of 13.06 vs 10.62 at a given length).

So which should I be using? or am I not understanding gravity or how to express it in a force?

ref: vs
Regards,
Jim

JMOS4 wrote: ↑Tue Jun 06, 2023 9:27 am was under the impression that gravity put a load of 14.7psi at sea level

Gravity is acceleration
https://www.britannica.com/science/gravity-physics

14.7 psi is pressure which will apply to all sides of an object.
Not just on the top.

Force is Mass x Acceleration.

What are you trying to do?
Crash another Mars rover?

Hi,

Trying to understand how gravity effects a piece of unsupported sheet metal, so to develop a loop (extra Material) for a stamping machine line.

Regards,
Jim

So gravity in sim is correct.

Your 14.7psi got nothing to do with it.

Remove 14.7 psi and apply weight of the part on top surface, distributed.
It should be pretty close to gravity.

Also make the weight at center of the part and compare.

Part will deform the same under same gravity.
Regardless what pressure its under.
0 psi or 1000 psi.

Well it might at extreme low and high pressure.

Hi again,

If I understand correctly the mass of the object multiplied by gravity 386.2in/s˄2 will give me the force on the piece of metal.

Inquiring as I am trying to come up with a spread sheet to gives some rules of thumb to correlate with the simulation.

Regards,
Jim

Frederick_Law wrote: ↑Tue Jun 06, 2023 10:36 am Remove 14.7 psi and apply weight of the part on top surface, distributed.
It should be pretty close to gravity.

Mass and weight is equally distributed on the object.
Applying weight/force on the object differently will have different results.

https://engineeringstatics.org/distribu ... ed%20loads.