Screw Connection Cast Iron/Cast Iron

Forum|Forum|10 years ago
August 9, 2016
18 replies
9428 views

Hi everyone,

Here David, new user of PTC Creo Simulate.

Hope you can help me with this question.

As far as I´ve read about screw connection, there are different possibilities to simulate a screw connection.

As you can see in the file Pic.jpg, my assembly is a round plate, supported in the inner face of a round structure. There is a screw connection along the contact surface between plate and structure.

At the begginig I wanted to be the most accurate possible. So I created with the Intelligent Fastener Tool all the screws (10.9. M24x100). Once I had them. What should I do? I started to create "interfaces" (Simulate>Refine Model>Connections) between each screw and plate, and also each screw and structure. Also structure and plate interface. I wasn´t sure about it, there were a lot of connections. In my experience with Marc Mentat in University, you can select easily all the contacts with a contact table.

Anyway I did that. I wasn´t sure so I choose other option: create fastener in Simulate>Refine model>Connections>Fastener

Once I've done it, what should I do? Create also interfaces between each screw with structure and plate?
Also, Interface between plate and structure should be created??

Thanks a lot in advanced, as you can see, I have a "interface" doubt, don´t know

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Assembly Design

Best answer by pkloninger(cust

Hello,

example attached.

Regards

Paul

J

JonathanHodgson

13-Aquamarine

Can't help with the details of how to approach the fasteners; but your part appears from the sketch to have cyclic symmetry. If your load also has cyclic symmetry, then for analysis purposes I would cut away all but a single 'pie slice' of the model, and just analyse one sector with one fastener. This will slash your run times and/or allow you to use a much better mesh / more detailed model. It will also mean you only have to create interfaces and other features for one fastener instead of all of them!

D

drodriguezortiz

Author

1-Visitor

Thanks for the answer.

My draw was without details, but not, it´s not symetrical, it has kind of windows, and a hole where an input shaft comes in.

My question anyway:

Should I create always Interfaces?

Because If I don't, the simulation would think that both parts are one (like one piece),

am I right?

U

unickque

1-Visitor

You can simulate all sorts of things, but the first question is: what are you trying to accomplish? Without going into FEA terms that is. For example: "I want to check if the pretension in the bolt is sufficient for this application", or "I want to check if the bolt does not strip the threads from the cast iron part".