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Failure & Prevention
Springs
are almost always the highest stressed component in any manufactured product
and as such are more likely to fail than any other component. Springs are
extremely reliable, but the consequences of failure are often very expensive
in terms of down-time, repair and inconvenience.
It is a common supposition that most springs fail due to poor design,
however it is estimated that half of all springs that fail were
appropriately designed, but had either been made from sub-standard raw
material, badly manufactured or had been mis-used. Others may fail because
something that should have been considered at the design stage had been
overlooked.
This course draws upon our considerable experience of examining springs that
have failed during manufacture, testing or use and has been designed to be
of benefit to anyone involved in the design or manufacture of all spring
types by highlighting possible means by which springs may fail and giving
advice on how to significantly reduce the chance of failure.
The course is suitable for anyone new to spring technology, as well as those
who have considerable experience. Combining lectures, practical
demonstrations and case histories to provide a complete picture of reasons
for spring failure and possible options for preventing future occurrences.
It is possible on the day that one or two delegates will be able to carry
out a failure investigation. Naturally it will not be possible to keep the
results confidential from the other delegates, but the diagnosis and advice
for prevention of further failures will be available during the day at no
extra charge.
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Introduction
Lecture – How Could Springs Fail?
Fracture
Loss of performance
Example
Lecture – Causes of Spring Failure
Introduction and laboratory demonstration
Overstressing – safe static design stresses
Fatigue failure mechanisms – Goodman diagrams
Setting down – relaxation data
Corrosion – general and pitting
Embrittlement – hydrogen and liquid metal
Unsatisfactory springmaking
Misuse
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Lecture
– Spring Failure Analysis
Visual
examination
Optical metallography
Scanning electron microscopy
Demonstration of Failure Analysis Techniques
Lecture – The Prevention of Spring Failure
Optimum material selection
Design safety
Correct spring manufacture
Correct spring use
FMEA
Case Histories
Illustrations of diagnosis and advice given to reduce failure recurrence
rate
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