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DFMEA vs. PFMEA Relationship: The cause in DFMEA becomes Failure in the PFMEA

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Chennaiite

Never-say-die
Trusted Information Resource
#2
I was reading this slide:

http://Elsmar.com/FMEA/sld024.htm

What do You think about this relationship?

Sometimes I see this relationship.

But Can I see it as a Rule?
At the outset, something that I learnt through this very forum and realized practically too is - in FMEA going by 'rules' will some times defeat the purpose of doing FMEA. As long as the purpose of the FMEA is met which is Risk identification, followed by prioritization, followed by mitigation, I do not mind violating any written rule, guideline, process step, Manual reference whatsoever. While there definitely must be a guideline or rule in place to help the FMEA team have consistent approach, use of such guideline shall not be enforced at the cost of value propagation the FMEA will add otherwise.

As for the relationship part, the causes in DFMEA are basically in the category of typical design cause, interface causes due to surrounding components, causes by virtue of changes over time like aging, wear/tear, etc, causes due to external environment, Customer use, and then causes due to manufacturing variation and manufacturability. Manufacturing variation of course has direct relevance to process design. And all other design causes do give significant 'inputs' to failure mode in PFMEA rather than becoming a failure mode themselves in PFMEA. It is important for PFMEA team to listen to these causes in the context of its effect and controls identified in DFMEA along with relevant historical data before moving any further.
 

somashekar

Staff member
Super Moderator
#3
No rules ... Chennaiite details it all.
The FMEA in itself is never a complete and closed task.
Weaker one has more to be accomplished while stronger one continues to mature.
What mature means here is that the dFMEA part begins to become the more bigger and driving factor of the FMEA process which takes all the learnings from the pFMEA. What can be controlled by design is a strong and safe process than what can be controlled in process.
Can you reach the FMEA = 100% dFMEA ~~~ That is the challenge for the engineers.
Cost, availability, market demand, technology and such many factors are present where this is not an optimum approach.
FMEA = dFMEA factor x + pFMEA factor y ... Increase the x and decrease the y as you learn and mature and make design changes. :bigwave:
 
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