If Dt is greater than 5, there is a reduction in strength which can be approximated by the curves in Figure 9-3. In addition, the lug and bushing must be checked to ensure that the deformations at design yield load are not excessive.įor values of eD less than 1.5, lug failures are likely to involve shear-out or hoop tension and for values of eD greater than 1.5, the bearing is likely to be critical.Īctual lug failures may involve more than one failure mode, but such interaction effects are accounted for in the values of K. The net-section of the lug through the pin must be checked against net-tension failure. The bearing strength of a lug loaded in tension, as shown in Figure 9-1, depends largely on the interaction between bearing, shear-out, and hoop-tension stresses in the part of the lug ahead of the pin. ![]() In addition, a short section on the stresses due to press fit bushings is presented. ![]() ![]() ![]() Modifications for lugs with less than 5 elongation are also presented. Also listed is a section which applies to lugs made from materials having ultimate elongations of at least 5 in any direction in the plane of the lug.
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