Hello,
how do i create non linear geometry connections for typical aluminium constructions (thermal expansion). For this often are created longholes in connections, self drilling screws are fixed than into the profiles. The profile itself can than slide in those connections.
Do i need to model the screws? Or is a simple methode possible?
Many thanks in advice
If you want to accurately model the connection itself, you can use a simplified bolt representation (just cylinders representing the shank, head, nut and washer) and include contact. There are several threads here discussing various ways of modeling bolts. Otherwise (if the joint is not a key part of the finite element model), you can consider simplifying it.
For this example I would prefer a 3D bolt and washer - simplified - with preload and friction.
Thanks but i am not comming to results, can somebody please check my model?
How does the simplifiying without 3d bolts works in elongated holes?
for round holes its clear with “constraints–>tie–>click booth round holes”.
But how to do with sliders?
20240724_Slider.pmx (7.4 MB)
It doesn’t converge from the beginning as the model is clearly underconstrained. Use tie constraints instead of contact wherever you can (initially maybe even everywhere). If necessary, add some boundary conditions (including prescribed displacement instead of force) until it starts converging.
But also refine the mesh (it’s very coarse now). The holes here are square due to coarse discretization:
It’s tricky without special features like connector elements available in Abaqus and without ignoring the possibility of tangential motion. You could try using 2-node spring elements but they have to be defined with keywords and it may not be worth the effort when you already have a full 3D model to be corrected.
Thanks will try with finer mesh now and use the round holes as tie.
Interessting the total model worked beforece when i deleted the 2nd bracket with the elongated holes etc.
