How to achieve similar Force vs Displacement

Ahmed_SaftyAhmed_Safty Member Posts: 2


I am working on a screw connection between two plates and the material properties that I have used is presented in the following picture for the Steel plate and the screw:

(Figure 1)

(Figure 2)

But the problem lies here with the results that I get:

(Figure 3)

(Figure 4)

And according to my supervisor, the stress is not correct and should be something like this(Ignore the detailed Mesh difference)(From another article):

(Figure 5)

I tried another way when I removed the Bilinear Isotropic Hardening and the stress came up to be like this:

(Figure 6)

This now looks logical,

but the problem now with the force reaction which is not logical resulted in linear line, and should be something like this (From another tester/article):

(Figure 7)

What should I do to get a similar results like figure 4 and 6

Answers

  • jonsolnjonsoln Posts: 21Member

    In figure 6 it looks like some material damage model is included (you can see that elements don't just stretch as the plates separate, but they are torn away from each other or eroded away). This will be needed in your model, along with a plasticity model. Your mesh is also far to coarse to accurately model the large stress gradients around the hole. Finally, I think a static structural analysis will struggle to converge with this problem. Consider using an explicit analysis instead.

    I don't have much experience with simulations like this, just trying my best to point you in the right direction. I don't think recreating those results will be easy, as there are a lot of effects occurring that need to be captured by your model.

  • peteroznewmanpeteroznewman Posts: 12,786Member
    edited November 25

    @Ahmed_Safty

    I agree with @jonsoln that you should use Explicit Dynamics to simulate the hole tearing.

    Here is a 2D version I did using Explicit Dynamics. When elements are removed from the model, that is called Erosion.

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