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Nicco S

Bolt Pretension 1D Elements - Problem

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Hello,

 

while modelling a simple calculation for a pretensioned bolt with 1D elements, i got the following problem:

 

  • In the visualisation you can see, that the 1D element on which the pretension is applied to gets lengthen. (A 'pretension' is applied, but to the wrong direction.)
  • According to the pretension file (.pret) everything seems to be reasonable, even if i add an additional tension load case after the pretension sub. However the contact forces do not.

 

The '1D bolt' i used is a single  ROD element , which  is connect to the guiding (independent) node of a RBE2 spider of the washer (shell elements) to both sides. I attached a picture where you can see my definition in the Pretension Manager window. I also attached a picture of the property of the ROD element.

 

I read all the infos in the users guide and online-help, but can't find an answer to my question. How can this problem be solved? Do i have to use  a special orientation of the pretension section and how is this defined correctly.

 

Please, i need your help! 

Screenshot.png

Screenshot-1.png

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16 hours ago, Nicco S said:

According to the pretension file (.pret) everything seems to be reasonable, even if i add an additional tension load case after the pretension sub. However the contact forces do not

HI,

 

Could you please share details and also related files?

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Hey Prakash,

here are the related files of the calculation.

The contact 1 and 2 are the important ones between the two parts, which should be connected by the pretensioned bolt.

 

 

 

 

 

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