What is DFMEA?

DFMEA is an acronym for Design Failure Mode and Effects Analysis, which is a systematic method used to identify potential failures in a product's design and their potential effects on the system or user. It's a type of Failure Mode and Effects Analysis (FMEA) specifically focused on design, helping to ensure product reliability and quality.

DFMEA was initially developed and widely used in the aerospace and rocket science industries due to the critical nature and high-stakes environment of these fields, where failures can be catastrophic. DFMEA may be used, however, in a wide variety of industries to detect issues. It’s typically implemented during the design phase of a project; when an existing design is modified or a completely new design is introduced, this is the best time to assess potential risks.

Identifying failures by using DFMEA requires a five step process:

  1. Determine the failure modes and severity. Modes of failure include unintended, degraded, inconsistent, full, and partial. The severity is ranked from 1-10, from something that may be a minor annoyance to something that violates regulations or otherwise has dangerous implications.
  2. Define the causes of failure. Each cause will be unique to the situation. Once you’ve identified the cause, you can then provide an occurrence score from 1-10 based on how likely the failure is going to happen.
  3. Analyze the current design controls. This verifies design safety; a product might have safeguards in its design to prevent failure. In this step, you will provide a detection score from 1-10 to determine whether it’s within the design to detect a failure before it occurs.
  4. Calculate the Risk Priority Number (RPN). The RPN is determined by the scores you have given for detection, occurrence, and severity. The failures that are given the highest priority are ones that frequently occur and are highly severe.
  5. Repeat the process until the desired RPN is reached. Follow each step again and again until your Design Failure Mode and Effects Analysis results in a design that has much fewer failures or doesn’t have any failures at all.
 

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