static load conversion

[vinoamcr]

Hello guys !!
I am working on a project of static analysis( backhoe loader) ...
this vehicle hits the other vehicle at the speed of 5.71 kph (@1100 rpm , mass = 8000kg ).
how can we convert these load into a static load ...?

pls help me out ...

with thanks
R. vinod raj

 

[desertfox]

To obtain a force you need the length of impact time or the deformation of the components in the impact.

 

[msquared48]

Or... otherwise termed as the overall rate of deceleration from the initial to the final speed.

Mike McCann, PE, SE (WA)

 

[JStephen]

You can make different assumptions about the time or the distance or the stiffness and come up with different answers. And change those assumptions and come up with other answers.
In some situations like that, they may do actual testing (I've seen video of that with crash-resistant barriers)
In some situations, the requirements may be based on absorbing energy (I've heard of that as a criteria for roll cages on bulldozers, etc.)

 

[drawoh]

vinoamcr,

As everybody is noting, impact is a dynamic event, not a static one. The force is a function of deceleration, due to springy components, deforming components, and the thing you hit, moving.

You can make some assumptions, and get an equivalent static force, but those assumptions may make your analysis nonsense.

--
JHG

 

[JeanLucPicard]

The easy way:
If:
[UL] [Li] v0-initial velocity [/Li] [Li] v-velocity at the moment of impact [/Li] [Li] s- the path from v0 to v [/Li] [Li] a- acceleration [/Li] [/UL]
Than acceleration is equal to: a= (v² - v0²) /(2*s). Hence, the v0=0 m/s => a=v²/2s.
Therefore, the force is F=m*a

The other way is to work out the collision, with impulse...

However, you must be aware that this isn't a static force, because you don't have a gradual increase of the force over time. You have an impact -dynamical response. Look the attachment

Live long and prosper!

 

[JeanLucPicard]

P.S., if this is for your school work, and you have trouble with the impulse method (more accurate) notify me...


Live long and prosper!