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Stress Corrosion Cracking
Stress
corrosion cracking is a failure mechanism that is caused by environment,
susceptible material, and tensile stress. Temperature is a significant
environmental factor affecting cracking.
For
stress corrosion cracking to occur all three conditions must be met
simultaneously. The component needs to be in a particular crack promoting
environment, the component must be made of a susceptible material, and there
must be tensile stresses above some minimum threshold value. An externally
applied load is not required as the tensile stresses may be due to residual
stresses in the material. The threshold stresses are commonly below the
yield stress of the material.
Stress
Corrosion Cracking Failures
Stress
corrosion cracking is an insidious type of failure as it can occur without
an externally applied load or at loads significantly below yield stress.
Thus, catastrophic failure can occur without significant deformation or
obvious deterioration of the component. Pitting is commonly associated with
stress corrosion cracking phenomena. |
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Aluminum
and stainless steel are well known for stress corrosion cracking problems.
However, all metals are susceptible to stress corrosion cracking in the right
environment.
Controlling Stress Corrosion Cracking
There are
several methods to prevent stress corrosion cracking. One common method
is proper selection of the appropriate material. A second method is to
remove the chemical species that promotes cracking. Another method is to
change the manufacturing process or design to
reduce the tensile stresses. AMC can provide engineering expertise
to prevent or reduce the likelihood of stress corrosion cracking in your
components.
Back to
Corrosion
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Altamonte Springs, FL 32714
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