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There are several common methods of analyzing a lug:
Simplified analysis - This method is based on first principles and involves making
simplifying assumptions about the nature of the failure
and calculating factors of safety. This has the advantage of
being relatively easy, but it only gives an approximate determination of the
adequacy of the lug.
Air Force Method - This method considers most of the failure modes above, and uses
empirical curves to determine more accurate allowable loads.
This method allows for lugs under axial loading, transverse loading,
or oblique loading. This method also accounts for the interaction
between the lug and the pin.
ASME BTH - This method considers most of the failure modes above, and uses simplified
equations with correction factors based on empirical data to determine more
accurate allowable loads. This method is simpler than the Air Force Method,
but it only allows for lugs under axial loading and does not account for the
interaction between the lug and the pin.
Simplified analysis - This method is based on first principles and involves making
simplifying assumptions about the nature of the failure
and calculating factors of safety. This has the advantage of
being relatively easy, but it only gives an approximate determination of the
adequacy of the lug.
Air Force Method - This method considers most of the failure modes above, and uses
empirical curves to determine more accurate allowable loads.
This method allows for lugs under axial loading, transverse loading,
or oblique loading. This method also accounts for the interaction
between the lug and the pin.
ASME BTH - This method considers most of the failure modes above, and uses simplified
equations with correction factors based on empirical data to determine more
accurate allowable loads. This method is simpler than the Air Force Method,
but it only allows for lugs under axial loading and does not account for the
interaction between the lug and the pin.
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