How to Investigate FASTENER FAILURES

Investigating fastener failures is crucial for determining the root cause and preventing future failures. Gathering information about the application and installation details is essential. Questions to consider include the type and grade of fastener used, compatibility of the nut and fastener streng...

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Bibliographic Details
Published in:American Fastener Journal 2024-01, Vol.40 (1), p.8-11
Main Author: Avellon, Guy
Format: Article
Language:English
Subjects:
Compatibility
Ductile fracture
Ductile-brittle transition
Failure analysis
Fasteners
Fatigue failure
Fracture surfaces
Grain boundaries
Load
Metal fatigue
Stainless steel
Washers & dryers
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Summary:Investigating fastener failures is crucial for determining the root cause and preventing future failures. Gathering information about the application and installation details is essential. Questions to consider include the type and grade of fastener used, compatibility of the nut and fastener strength, service loads, environmental conditions, and installation method. Categorizing collected data helps narrow down failure possibilities. Fracture surface appearance can provide insights into the cause of failure, such as ductile or brittle fractures. Metal fatigue can be identified by conchoidal or beach marks on the fracture surface. Ancillary components, such as washers and coatings, should be checked for compatibility and potential loss of clamp load. External loads, environment, and installation methods also play a role in fastener failure. Proper investigation techniques can determine the cause-effect relationship and enable preventive measures to be implemented.
ISSN:1064-3834