## General Mechanical

#### Composite plates bolt connection

• Venkatesan
Subscriber

I have made two composite plates ( MP1 and MP2)  with a latch plate on top bolted together with 4 bolts as a shear joint connection (single assembly) in Inventor and imported to workbench. In order to create the GRP plates, surface was created for the plates solid model and the surfaces were used to create ply in ACP pre. One end the MP1 plate is fixed and the farthest end of MP2 is loaded. I'm interested in the failure modes of the GRP plates.

I would like to know the contacts (frictional/fricctionless/bonded) to be used between the plates and between plates and bolts.

• peteroznewman
Subscriber

• Venkatesan
Subscriber

• Venkatesan
Subscriber

Can you also guide me on how to use the shell thickness effect

• peteroznewman
Subscriber

It looks like the top plate has the shell thickness all below it, while the bottom plates have the shell thickness all above it.

As long as these offsets are correctly defined, and the combined thickness of the two shells equals the geometric gap between the surfaces, the contact gap/penetration should compute as closed to within a very small error if the shell thickness effect is turned on for the contact between the lower plates and the upper plate.

You will also need contact between the bolt heads and the upper plate.

You will need bonded contact between the bolt shaft and the lower plates, however, you should divide the face of the bolt shaft so the lower portion is used in the bonded contact while the upper half of the bolt shaft could be used for a bolt preload.

• Venkatesan
Subscriber

Is it ok,if I create ply in ACP Pre for the top plate downwards and bottom plates upwards such that there is no gap between the plates without using the shell thickness effect? Or should I model the plates with mid surface like the picture attached  with shell thickness effect on and create ply above and below the mid surface for top and bottom plates with offset type set to middle in Geometry Definition?

• Venkatesan
Subscriber

Right now I'm using bonded contact for bolt heads and top plate and also for bottom plates. Frictonal contact between top and bottom plates and frictionless between the bolt shafts and the top and bottom plates. I feel I'm making some mistake with the contacts as I'm not getting the expected failure modes.

I also want to confirm if it ok to import the whole assembly from Inventor as a single model, making surfaces from solids for top and bottom plates and creating ply only for the plates in ACP Pre?

• peteroznewman
Subscriber

I see the nuts below in the last image that were not visible in the first image.

Please do File Archive to save a .wbpz file and attach that to your reply along with a note to say what version of ANSYS you are using so I can take a look at your ACP Pre model.  If you still have the original model that was built in one direction, and not from the midsurface, that would be interesting to see the .wbpz file also.

• Venkatesan
Subscriber

I'm using workbench 16.0

• Venkatesan
Subscriber

Model with mid surface

• bobby
Subscriber

hello, Can I ask you about ACP pre? how to make a joint design were imported from inventor to workbench and then using ACP to make a laminate?

because I've tried to do that but still error when using ACP.

• peteroznewman
Subscriber

@bobby, Please open a New Discussion to get your question answered. Once you do, you can delete the post above.

• Venkatesan
Subscriber

@Peter, Can you suggest me the friction coefficient value to be used between two GRP plates?

• peteroznewman
Subscriber

Use a low value for the friction, like 0.05, which will give you a conservative result.  That means you can use the model to search for the load that corresponds to the onset of a failure condition and a low load will be found.  If the friction is actually higher than the value used in the model and the load is limited to the value found in the analysis, there is little chance of failure.