Justin Wolterinck

Round profile correct stress and tube wrong stress

Discussion created by Justin Wolterinck on Feb 17, 2017
Latest reply on Feb 17, 2017 by Justin Wolterinck

Hello,

 

I am using solidworks simulation to validiate my calculations.

Material: S235

Force: 4558,58N

Position of the force: Exactly in the middle

The deformation in Y and the normal stress in Z.

1 side fixed and one side as a roller

 

When I use an round profile of ø26.7mm L=384 the values are correct.

Deformation round profile

  

As you can see, sw has 1.035 and my own calculation 1.026 so this is correct.

Stress round profile

sw 229,5 and my own 234,189 so this is correct too.

Deformation round tube

Now i use the exact same file and change the profile to ø33,4 x 2,65 L=384 Material: S235

I will start with the max deformation calculation:

Sw 0.829 and my own 0.82 so you should thing this is correct too.

 

And now my problem:

Normal stress round tube

I can't find the reason why this is happening because i am doing exactly the same as the ø26.7 profile.

I am using SW 2013 but also tried it on sw 2016 and ANSYS and all the progrems are giving me the same value.

 

Why can't a simulation program calculate this or what am i doing wrong? If someone wants more info, please tell me.

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