Failure modeBlockSim

[Irene]

Hello,

I would like to know if it's possible to use BlockSim in this case:
I have a quantity of parts to be tested , a test file is proposed .Different stresses are applied on the parts .
So, There are different failure modes.
Can I simulate a failure mode with a blockdiagram ?
Please help
Regards

[Dr Dave]

Irene,

It is possible to consider different failure modes as a series system and model the system using BlockSim. Recall that you are assuming that the failure modes are independent when you do so.

What do you mean by 'different stresses are applied on the parts'? Do you mean that each part gets a sequence of different stresses until it fails, or different parts are stressed only one failure mode? That makes a difference.

The nice thing about BlockSim is that it can input data for the failure mode block from either WEibull++ or ALTA. Depending on what your test plan is, you may have an accelerated test of the failure mode that requires ALTA, or you may have a standard life test that requires Weibull++.

Hope this helps.

Dr Dave

[irene]

Hello,

Thank you for your answer Dr Dave concerning failure mode and Blocksim.

A few parts get a sequence of different stresses (stresses are applied successively) until 1 ,2 or 3 fail .
The failure modes are different . There are 3 failure modes :a,b,c
For a better understanding , could you confirm that I can use Blocksim to determine system reliability ? Before I 'll make a weibull analysis for each failure mode in order to know Ra, Rb, Rc.

I'll appreciate once more to have your comments on this
Many thanks for your help
Best regards
Irene

[Dr Dave]

Irene,

Yes, I confirm that you can use BlockSim this way.

The trickier part is getting Ra, Rb, and Rc after your sequence of different stresses. Sounds like you will need to use ALTA Pro to calculate the reliability under usual use conditions, given your stress test profile.

Best wishes
Dr. Dave