Learning Forum

[ravikumarjeela7]

for connecting a solid block to sheet metal surface, I have created bonded contact at specific Areas where we have connected bolts at that locations in reality. But in drop test that solid blocks go off from the fixed Locations. If I select the entire solid block Surface area and entire sheet metal Surface area then it works correctly, but that does not represent the reality.

what could be the reasons for that ? How can I make Simulation work with these bolted Areas instead of total area of Solid block and Sheet metal?

 

 

 

[Sandeep Medikonda]

If you want them to stick together, increase the pinball radius if this is a transient/static structural analysis. I couldn't quite tell from the images.

If you want to create bonded contacts at just the bolted locations. I would suggest you take your geometry to SpaceClaim/DM and create imprints. This way, you can easily select those surfaces in the bonded contacts. Of course, there are many other ways to do this in mechanical itself.

P.S: Drop tests are typically best suited for an Explicit Analysis if there is impact involved

[ravikumarjeela7]

Thank you Sandeep for your Reply. yes, I am doing explicit simulations and I have no pinball radius Option. I have created Bonded contacts with imprint Areas created from SpaceClaim. First I have only selected bolt area as in the above. But the solid blocks go off with Impact. Secod time I have tried with taking whole area of solid block for bonded contact and did Simulations. Again the solid blocks go off. and it is same behaviour as in first case.

I could not able to understand why this bonded contact is not working at all between solidblocks and sheetmetal although I have increased area of contact to whole solid block ? 

 

 

[jj77]

Not an expert in explicit ANSYS, but you need to define what is called a body interaction, not a normal contact (as used say in static).

This object looks like this (yellow marking) and you can have a bonded type of interaction between parts/bodies.

 

For more info look on the chapter called (or google this and you will get all the info you need). 

Body Interactions in Explicit Dynamics Analyses

 

 Below is an example that has two different interactions, one frictional and one bonded.

 

 

[ravikumarjeela7]

Thank you for your Suggestion jj77. I have also given the Body interactions for all the bodies in assembly as frictional. you can see in the attachment below. and I have given all the bolted Connections and spot Welding Connections between bodies in Assembly  as the bonded contacts in CONTACTS.

I have a doubt regarding this CONTACTS and BODY INTERACTIONS in Explicit Dynamics. what type of Body Connections which should give under BODY INTERACTIONS ?

My model is an Assembly with few bodies connected together with bolts and sopt Welding Joints and droping from a height of 2 metre onto a fixed plate.

Do I have to define all bolted and spot Welding Connections bewteen bodies in Assembly also under BODY INTERACTIONS ? what type of Connections come under CONTACTS and what under BODY INTERACTIONS in Explicit Dynamics ?