Failure Analysis for Screw Thread of Joint

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Failure Analysis for Screw Thread of Joint
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Abstract:

A screw failure was found when the line joints were taken apart. This paper records the results of

macroscopic observation, the microscopic observation and measurement, the observation of the screw, and the material

tests of the failure part, such as hardness test and metallographic analysis. The results indicated a seizure of the

threads on the line joints which originated in an adhesive wear, the type of which causes most severe damage. Combined

with the assembly mechanism of the screw thread connection, it is concluded that using the same material is the

internal cause of the adhesive wear of the line joint. Too little interspaces between the joint which leading the screw

thread of the joint broken during installation and the remainders accumulate made the nut deflexion is the main cause

of the adhesive wear of the line joint.

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Online: November 28,2016
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