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fastener proof load? 3

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scottmaha

Mechanical
Joined
May 6, 2002
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28
Location
US
could someone explain proof loading of fasteners to me?

thanks
 
The proof load of a fastener is the maximum load under which no permanent deformation occurs, i.e. all strain is elastic and recoverable. Materials specifications define the proof load as 90% of the yield strength.

During testing, the fastener is initially measured, then loaded to the proof load. The load is then released, and the part re-measured. The part meets the requirement if the part has not experienced any length change.
 
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