Elite Consulting are UK stress analysis consultants providing Pro/Engineer and Pro/Mechanica training courses, software consultancy and support.

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FMEA (Failure Modes and Effects Analysis)

Failure Modes & Effects Analysis (FMEA) is a formalised process of assessing the likelihood of failures and their severity. It should start in the design phase to ensure that potential failure modes and their associated causes have been considered and addressed.

It seeks to quantify Severity, Occurrence and Detection, so as to be able to rank potential failure modes according to a Risk Priority Number (RPN). It is used extensively in the motor industry and is now spreading to other fields.

It is best performed as a cross-functional team brainstorming session, starting early in the Design process, as conducting System and Design FMEA's may lead to design changes. It can also be used to identify Critical Characteristic. An example output is given below. Performing a Process FMEA can help to refine the manufacturing process.

ELITE CONSULTING SYSTEM/PART  DESIGN FMEA

System/Part No. & Name

Engine Mounting Bracket

Suppliers/Plants Affected

ABC Eng./Main assembly

Design responsibility

Chassis Dept

Model Year/Product

2002 - Project XYZ

Other areas Involved

Engine Dept.

Engineering Rel. Date

Dec-01

Part or System Function

Potential Failure Mode

Potential Effects of Failure

Severity

 

Potential Causes of Failure

Occurr ence

Detection Method

Detec tion

RPN

Recomm ended  Action

To Support Engine

Fails to Support Engine

Engine Falls out of Car

10

YC

Fatigue. Over stressed due to stress raiser, or insufficient section depth, or Incorrectly specified material or process

3

FE Analysis (D=3) Rig Test (D=2) Vehicle Endurance (D=1)

3

90

Redesign to ensure lower stresses. Introduce fail-Safe Feature

To Assist in Vibration Isolation

Amplifies Vibration

Customer feels increased vibration

5

Natural Frequency being excited

4

FE Analysis (D=3) Bracket Rig Test (D=2) Vehicle Modal Test (D=1)

3

60

Use CAE to check stiffness and natural frequencies of brkt and system. Modify design to alter frequency if necessary
 

Elite Consulting will come to you to undertake training and consultancy, or to be an FMEA facilitator.

Please contact us for more details.

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Copyright © 1998 - 2008 Elite Consulting Ltd. Registered in England & Wales No. 2823712 . Last modified: April 05, 2008

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