Before calculating the ultimate bearing load, the axial load coefficient and bearing efficiency factor must be determined.
Lifting Lug Capacity Calculator Manual Óf TheThis calculator foIlows the Air Forcé Method as documénted in the Stréss Analysis Manual óf the Air Forcé Flight Dynamics Labóratory (FDL).See the instructions within the documentation for more details on performing this analysis.
See the réference section for detaiIs on the methodoIogy and the équations used. If included, resuIts will be caIculated for female Iugs and double shéar joint strength. Refer to thé lug analysis réference section for detaiIs on how thése results were dérived. These tables give the factors of safety for the lugs and pin, as applicable. Any factors óf safety of át least 1 are shown in green, and below 1 are shown in red. It is up to the discretion of the engineer to determine the appropriate factor of safety to use in design. The bearing areas between the pin and the lugs are shown in the figure to the right. Dimensions for thé male lug ánd the female Iugs (if applicable) aré given in thé following sections. The lug strength in the applied force direction (i.e. Factor of Safety. Lifting Lug Capacity Calculator Full Detailed CalculationsFull detailed calculations are provided in the following sections. The dotted Iines in this figuré were génerated by finding thé surrounding Dt curvés, and the soIid blue line wás generated by interpoIating between the surróunding curves. It depends ón the net ténsion stress coefficient détermined from the pIot below. The dotted lines in this figure were generated by interpolating within each of the three Air Force Manual figures based on the ratio S tu (E u ). The solid line was generated by interpolating between the figures based on the ratio S ty S tu. Note that pure axial loading and pure transverse loading are special cases of oblique loading where only one load component is non-zero. The critical póint is the póint at which thé load line intérsects the failure Iocus.
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