Unable to generate Spot weld connection between Solid elements

Altair Employee

Feb 25, 2019

Updated Jun 27, 2021 by Altair Forum User

Hello Everyone,

I am trying to establish spot weld between Solid Hexa8N elements. I have tried to use 'plot', 'Type 2 spring' and 'HC Hexa' type. But in all the cases I am having following issues:

1) Type (Plot): Simulation ran but solid elements were not connected

2) Type [Spring (Type 2)]: Solver not able to identify the surface to create a spring elements.

3) Type HC Hexa: Contact interface defined by solver itself is not correct.

Apart from aforementioned problem I also want to give the max tensile strength of spot weld as as 40% of base material.

Thanks in advance.

Nitin Jain

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Pranav Hari

Altair Community Member

Feb 26, 2019

Updated Feb 26, 2019 by Pranav Hari

Can you please share your model.

You can use the secure drop box link https://ftin.india.altair.com:8443/filedrop/~Ma3TaE 

Altair Forum User

Altair Employee

Feb 26, 2019

Updated Feb 26, 2019 by Altair Forum User

Hello @Pranav Hari,

I have uploaded the file on the shared link.

But I have deleted some parts and Boundary conditions.

Please assign boundary condition as per your convenience.

Regards

Nitin Jain

Pranav Hari

Altair Community Member

Feb 27, 2019

Updated Feb 27, 2019 by Pranav Hari

Hi Nitin Jain

I will check and update you.

Pranav Hari

Altair Community Member

Feb 27, 2019

Updated Feb 27, 2019 by Pranav Hari

Hi Nitin Jain

The recommended element types in Radioss for spot weld creation are shell element.

Surface 1 and 2 for each solid spotweld should always connect with a shell element. If one surface of one solid spotweld is not connected with a shell element,

then the stiffness will not be computed correctly and an error may occur

Since you are having solid elements you have to create a shell coat and then connect using spots.

There are three different ways of modeling spotweld:

•	Node Connect

•	Spring (/PROP/TYPE13) Connect

•	Solid Connect

When you create a spot weld using type 2 spring, by default you will get the (TYPE13 spring property + TYPE2 contact).

In your case since you have to define max tensile strength of spot weld as 40% of the base material, then I recommend you use the solid connect method.

Here you can specify separate failure criteria.

This is explained in detail in the Radioss help documentation. Please have a look

<?xml version="1.0" encoding="UTF-8"?>

Also, have a look at the Radioss example on solid spot weld creation.

<?xml version="1.0" encoding="UTF-8"?>

I have shared the 2 example deck files, which is modeled using default spring contact and also solid connect. Check that too.

Unable to find an attachment - read this blog

Simon Križnik

Altair Community Member

Feb 27, 2019

Updated Feb 27, 2019 by Simon Križnik

Since you are having solid elements you have to create a shell coat and then connect using spots.

Contact surfaces can also be used.

Altair Forum User

Altair Employee

Mar 1, 2019

Updated Mar 1, 2019 by Altair Forum User

Thanks @Pranav Hari and @Ivan,

I think making surface and then spot weld is time consuming process.

Moreover I request you to please teach me, if I connect the extracted surface with connector: then solids will be connected as well or it will connect only extracted surfaces.

Right now, I am trying to make the Seam weld connections (Hexa Tapered T type) but I am getting the distorted elements:

<?xml version="1.0" encoding="UTF-8"?>