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KONA OWNER’S MANUAL
40
A crude, often-used example is bending a paper clip
back and forth (repeated loading) until it breaks. This
simple denition will help you understand that fatigue has
nothing to do with time or age. A bicycle in a garage does
not fatigue. Fatigue happens only through use.
So what kind of “damage” are we talking about? On a
microscopic level, a crack forms in a highly stressed area.
As the load is repeatedly applied, the crack grows. At some
point the crack becomes visible to the naked eye. Eventually
it becomes so large that the part is too weak to carry the
load that it could carry without the crack. At that point there
can be a complete and immediate failure of the part
.
One can design a part that is so strong that fatigue life is
nearly innite. This requires a lot of material and a lot of
weight. Any structure that must be light and strong will have a
nite fatigue life. Aircraft, race cars, motorcycles all have parts
with nite fatigue lives. If you wanted a bicycle with an innite
fatigue life, it would weigh far more than any bicycle sold
today. So we all make a tradeoff: the wonderful, lightweight
performance we want requires that we inspect the structure
.
In most cases a fatigue crack is not a defect. It is a sign
that the part has been worn out, a sign the part has
reached the end of its useful life. When your car tires
wear down to the point that the tread bars are contact-
ing the road, those tires are not defective. Those tires are
worn out and the tread bar says “time for replacement.
When a metal part shows a fatigue crack, it is worn out.
The crack says “time for replacement.
2K17_Kona_Owners_Manual.indd 40 29.1.2016 15.27
40


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