Bedienungsanleitung Marin Bikes (Seite 44 von 54) (Englisch)

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What to look for:

• ONCE A CRACKS STARTS IT CAN

GROW AND GROW FAST.

Think about the crack as forming a

pathway to failure. This means that any

crack is potentially dangerous and will

only become more dangerous.

SIMPLE RULE 1 :

If you nd crack, replace

the part.

• CORROSSION SPEEDS DAMAGE.

Cracks grow more quickly when they

are in a corrosive environment. Think

about the corrosive solution as further

weakening and extending the crack.

SIMPLE RULE 2 :

Clean your bike,

lubricate your bike,

protect your bike from

salt, remove any salt as

soon as you can.

• STAINS AND DISCOLORATION

CAN OCCUR NEAR A CRACK.

Such staining may be a warning sign

that a crack exists.

SIMPLE RULE 3 :

Inspect and investigate

any staining to see if it is

associated with a crack.

• SIGNIFICANT SCRATCHES,

GOUGES, DENTS OR SCORING

CREATE STARTING POINTS FOR

CRACKS.

Think about the cut surface as a focal

point for stress (in fact engineers call

such areas “stress risers,” areas where

the stress is increased). Perhaps you

have seen glass cut? Recall how the

glass was scored and then broke on

the scored line.

SIMPLE RULE 4 :

Do not scratch, gouge

or score any surface.

If you do, pay frequent

attention to this area or

replace the part.

The basics of metal fatigue

Common sense tells us that nothing that is used lasts forever. The more

you use something, and the harder you use it, and the worse the conditions

you use it in, the shorter its life.

Fatigue is the term used to describe accumulated damage to a part caused

by repeated loading. To cause fatigue damage, the load the part receives

must be great enough. 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.

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