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Optistruct Contact - Fatigue

Hi Everyone,

I am working on project to carry out contact stress and later to do fatigue analysis. I am using Optistruct for this analysis.

Image_01 shows how parts are assembled to each other.

Image_02 & 03 shows that area of contacts I am interested in.

I have attached .hm file for review.

Can someone please guide me for how to define contacts between,

1. Inner diameter of housing to Outer diameter of Bush (Press fitted Bush)

2. Inner Diameter of Bush to Shaft diameter. (Shaft rotates on Bush ID)

3. Face of Shaft collar to Face of the Housing.

Model is constrained at the Bolt location and Load of 200 Nm is applied at the center of Shaft.

Aim is to Study the contact stress at Press fit area, Bush ID and Side face of collar of the Shaft.

For Fatigue analysis, I would like to check if 200 Nm Load is applied at interval of every 2 sec, what would be the life of the Bush?

Regards,

Jagdish

Shaft_bushing.hm

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Altair Forum User

Hi,

You can use Contacts with Overlap to model pressfit using OptiStruct. I am attaching an example model for the same.

There are tutorials available on OptiStruct help on fatigue analysis, I suggest you to go through the same.

PressFit.fem

Altair Forum User

Hi Prakash, @Prakash Pagadala

Thanks for the prompt response and .fem file. I have gone through the file you send me.

1. While opening the .fem file it shows message (Please see attached image). Is it a problem?

2. Why Forced displacement (SPCD) is necessary in this case?

3. How do I define contacts between Shaft OD and ID of bush and Shaft collar side face to housing side face? should it be a Contact type “SLIDE” and MORIENT as Blank?

4. Also for Fatigue Analysis I have gone through tutorial of “Fatigue Process Manager (FPM) using SN (Stress Life) Method. In Loading Sequence tab what is

a. Loading Magnitude

b. Scale

c. Offset

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