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Please list the important practical consequences of fatigue of solder. Explain why they are useful.

Please list the important practical consequences of fatigue of solder. Explain why they are useful.

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Answer :

Solder fatigue is the mechanical degradation of solder due to deformation under cyclic loading.

This is due to coefficient of thermal expansion miss match.

The consequences are PCB substrate and system level effects, drive stresses in the interconnects or solder joints.

Repeated temperature cycling eventually leads to thermomechanical fatigue. This results in fractures at joints.

They are useful to understand the solder is in failure. This warns user to stop using the solder. This indicate life of solder is over.

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