hello,
i'm new in this forum and i have to compliment with you for it. I need help in making a DFMEA (i'm doing a stage about which i'll make a thesis to graduate in Electronic Engineering); the object is an IC board for automotive applications. I have problems in determining occurence of failure mode because i haven't any reliability data for board's components. Can you tell me a way to follow? Can you signal me any example of DFMEA for products like mine which i can use as a templete? Or any other suggestion?
Thank you for everything!!

hello,
i'm new in this forum and i have to compliment with you for it. I need help in making a DFMEA (i'm doing a stage about which i'll make a thesis to graduate in Electronic Engineering); the object is an IC board for automotive applications. I have problems in determining occurence of failure mode because i haven't any reliability data for board's components. Can you tell me a way to follow? Can you signal me any example of DFMEA for products like mine which i can use as a templete? Or any other suggestion?
Thank you for everything!!

Welcome to the Cove :D

Are you dealing with an imaginary or hypothetical product? If so, then your failure rates will also be imaginary, no? It's hard to know from this perspective what's actually expected in your assignment. If you don't have one already, a copy of either the AIAG FMEA manual (http://mows.aiag.org/source/Orders/index.cfm?section=orders&ETask=1&Task=1&SEARCH_TYPE=FIND&FindIn=1&FindSpec=fmea&x=0&y=0) or SAE J1739 (http://www.sae.org/technical/standards/J1739_200208) will be very helpful to you.

hello,
i'm new in this forum and i have to compliment with you for it. I need help in making a DFMEA (i'm doing a stage about which i'll make a thesis to graduate in Electronic Engineering); the object is an IC board for automotive applications. I have problems in determining occurence of failure mode because i haven't any reliability data for board's components. Can you tell me a way to follow? Can you signal me any example of DFMEA for products like mine which i can use as a templete? Or any other suggestion?
Thank you for everything!!

Welcome to the Cove.

As Jim says, without knowing more about your project it will be hard answering your question. The best resource is, of course, the AIAG FMEA book that Jim suggested.

Rankings are given between 1 and 10 (10 being worst) based on the failure rate.

As a very rough gage, you could use the following and "guesstimate" the occurrence.

Very high: Failure is almost inevitable (1 in 2 or 3) Ranking 9 or 10
High: Repeated failures (1 in 8 to 1 in 20) Ranking 7 or 8
Moderate: Occasional failures (1 in 80 to 1 in 2,000) 4, 5 or 6
Low: (1 in 15,000 to 1 in 150,000) 2 or 3
Remote: Failure is unlikely 1 in 1 1/2 million 1

I hope this gives you a start on your project.

Dave

First of all thank you very much for answering! :D

Are you dealing with an imaginary or hypothetical product?

The product is real, is an IC board for the automotive (a steer by wire application). I've done the FMEA following AIAG guidelines and i've reached the point when i have to decide the occurrance of the failure modes highlighted. I don't know how because i have no data from the field since the board have yet to be built...i've tried to search on the web some reliability information from manufacturer's website but i have found little...any suggestion about any source of material that i can use as a templete for my work?

regards

An FMEA is a risk analysis and must be done as a team effort. The team then, based on their knowledge and involvement with the product, come to agreement on the various ratings.

Also am I correct in concluding from your last posting that trhe PFMEA has already been done? If the DFMEA was not done first, how were the critical (key) characteristics determined.

If on the other hand this is a study exercise, you would be best to list assumptions that the "team" made - beginning with those on which the design was based.

Unfortunately in my 3rd party auditing experience I have seen too many instances of PFMEAs done without any knowledge of the outcome of the DFMEA as well as both types of FMEAs done by a single individual.

RickT

Also am I correct in concluding from your last posting that trhe PFMEA has already been done?
If PFMEA is for process FMEA, we haven't done it yet because we need (for now) only design FMEA....
There is a team, but we are inexperienced about the reliability of this type of product....
So i need (web material, reference guides, examples) some suggestion to understand how to give occurence to failure modes without having any field data...
As i told i tried to search in manufacturer's website and datasheet to find components' reliability result, but i haven't found a lot of material....

http://www.sqconline.com/reliability/index.html

This may help with MTBF

Bazzle

http://www.sqconline.com/reliability/index.html

thank you! Very interesting and useful! Any other ideas?

i'll make an example to clarify what i think i need. I have to use a microcontroller for the board, since I cannot find any data for my particular microcontroler in manufacturer datasheet i'm searching on the web for any reliability's information regarding microcontroller in general, like common failure modes to glean the occurrence of a determined failure mode in my specific case....
I hope i succeeded in explaining myself...sorry for my english...it's not very good....:)