Currently I am analysing Brake Flange component , Here there are **4 Bolts which acting 106206 N -total.** I need to analyse whether is it safe or not.

I did 2 iteration for **ductile material - 350 Mpa Yield Strength. **

1. The **Von-Mises Value is 840 Mpa** & Principle Stress** P3 - 192 Mpa** ( Due to compressive Load ),

Here Von Mises value is not within the limit of yield strength, but P3 value is in limit. In this condition I consider von mises value

So this is not in safe. **In Practical this gets crack , so analysed value is right.**

2. I changed the design and analysed the flange for same material.

Now Von Mises Value - 470 Mpa & P3 - 178 Mpa

Here Von Mises value is not within the limit of yield strength, but P3 Value is in limit. In this condition I said von - mises value .

So this is not in safe. **In Practical this is OK.**

Kindly give the solution for this model.

Give difference between Von-Mises, Principal Stress P1, P2, & P3

I think there are 2 things to consider here.

1. failure criteria. for this, you'll have to tell us about the material, what loading this will be affected by, heat treating, what you're concerned with (cracking...etc). this is separate from anything FEA related.

2. the stresses that you are using. it appears that you may be using the max stress that you see on the plot. remember that FEA is not perfect. your element size has an effect on the stress and so do sharp corners. so I would ensure that before you choose a stress to evaluate your failure criteria, you consider whether you have a displacement converged solution and then second, ensure that you aren't just reading the max stress at a singularity/stress concentration.