failure mode and effect analysis

1. Failure Mode
Effects Analysis(FMEA)
Geneveive Lara
Zarah Mae Tabor
TQM
Chapter 19 Mr. Abelito T. Quiwa MBA

2. FMEA Reference Manual for an
Automotive Industry

3. A failure modes and
effects analysis
(FMEA),is
a procedure in operations
management for analysis
of potential failure modes
within a system for
classification by severity
or determination of the
effect of failures on the
system. It is widely used
TQM strategy for success of organization is to
in manufacturing design in quality and reliability in the products
industries in various
phases of the product life or services early in the development cycle.
cycle and is now
increasingly finding use in Failure Mode and Effects Analysis ( FMEA)
the service
industry. Failure Is a methodology of analyzing potential reliability
modes are any errors or
defects in a
problems early in the development cycle where
process, design, or it is easier to take action to overcome these
issues, thereby enhancing reliability through
item, especially those that
affect the customer, and
can be potential or
actual. Effects design.
analysis refers to studying
the consequences of
those failures.

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5. Reliability is a probability of survival of a
product. The survival or success of a
product can be characterized by a
random variable.
*Continuous
* Discrete
f(x)>= 0 and integral of f(x)dx=1

6. Hazard function is a measure of a
product failure.
The reliability can be mathematically
described as:
R(t)=f(t)lh(t)

7. • Failure rate indicates the number
of failure per unit time.

8. Failure cause– the physical
chemical, metallurgical, design
defects, quality defects or other process
which are basic reason for failure.
Failure mode – it is the observed result of
failure .
Failure effect- it is all about studying the
effect of failure of components or part of
the system.

9.  System- Focuses on global system
functions.
 Design- Focuses on component &
subsystems
 Process- Focuses on manufacturing &
assembly processes
 Service- Focuses on service functions
 Software- Focuses on software functions

10. Design FMEA
Subsystem Subsystem Subsystem Subsystem Subsystem
1 2 3 4 5
Subsub- Subsub- Subsub- Subsub- Subsub-
system1 system1 system1 system1 system1
Subsub- Subsub- Subsub-
Subsub- Subsub-
system2 system2 system2 system2
system2

11. FMEA Reference Manual for an Automotive
Industry
• FMEA Team
• FMEA Risk Priority Number (RPN)
Technique
• Risk Priority Number
(RPN)

12. Step 1: Define the product
/process & its functions.
Step 2: Construct the reliability
block diagram of the
product/process.
Step 3: Complete the
header on the FMEA
worksheet
Step 4: List the part along
with its functions

13. Step 5:Identify potential failure
modes
Step 6:Potential Effects of
Failure
Step 7:Assign severity number
for the effect
Step 8: Classification
Step 9: Potential Causes
Step 10: Probability of
Occurrence

14. Step 11: Identify Current Controls
( Design/process)
Step 12: Determine the likelihood of
detection
Step 13: Assign Risk Priority
Number
Step 14: Determine the
recommended actions
Step 15:Estimate the new ranks

15. The process of FMEA
is applied to
improving the
process in contrast
with the design in
DFMEA.

16. FMEA RPN is more popular in the
automatic industry .
FMECA consist of two parts as given:
* Failure Mode Effect Analysis
* Criticality Analysis

17. The failure rate data for
each part has to be
calculated based on
field failures.
Severity Refers to the
effects of the each failure
modes in the system .

18. Item Criticality is used criticality
analysis. We calculate the criticality
number in each one of the failure
modes of the rectifier diode.
Cr ( of a part at each severity level of effect)
Cr= Criticality number for a part
Cm=Individual criticality numbers for the
various failure mode having the same severity
level.

19. Reliability of products and services is
quite important for quality and TQM. In
this chapter, a brief introduction to
reliability covering bath
curve, probability density function and
sample calculation of reliability were
discussed. FMEA is all bout studying the
effect of failure of parts or components
on the system, thus a reliability analysis
tool, FMEA aimed at improving in the
reliability of the products.

20. the FMEA requires understanding the FF:
*failure mode
*failure causes
*failure effects

21. References:
Wikidepia
Failure mode and effect analysis
books
Youtube.com

22. THANK YOU
and
GOD BLESS US
ALWAYS! ^_^