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      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
marvin1991

CBUSH SPRING

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Hello everbody,

 

in the following picture you see 3 examples of a spring (CBUSH). The only difference is, that the node in the middle (were the force is) has different coordinates in each example.

I don´t understand why the Results are so different.

In example one (on top of the picture) the result is nearly 0

In example two ( in the middle of the picture) the node is -1 in y-coordinate and the difference is huge!! There the max displcement in Y is -3306

 

I have absolut no explanation for that.

Thanks for helping :)

 

image.thumb.png.41e0c5d608a77a2e61de6782e7add30e.png

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But your result is not making sense or? You have the highest displacement at the constrainsts. But the force is in the middle, between the springs. And even inthe middle the displacment is 1,9*10^-9 in the girst example. Thats nearly 0 ..

Rahul R likes this

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Yes that is because of the I made the CBUSH rigid just to check if this is valid. 

 

Without CID solver gave a random displacement and with CID set to zero it is giving expected results. 

 

it is recommended that another CID be selected to define the element x-axis.

Rahul R likes this

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okay thanks.

But when i increase the force and lower the K1 factor the displacement is still nearly 0 ..but why?

Can you tell me how to define the elemet x-axis? I have never done that before. Maybe you can send me a little example?

Thanks for helping!! :)

Rahul R likes this

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