Mechanics
Lifting lug analysis
Simplified analysis of a flat lifting lug with net tension, hole bearing, shear-out, base section and pin checks.
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Simplified analysis of a flat lifting lug with net tension, hole bearing, shear-out, base section and pin checks.
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Enter the lug geometry, pin data and load, then run the analysis to display stresses, critical sections and utilizations.
Enter the lug geometry, pin data and load, then run the analysis to display stresses, critical sections and utilizations.
Enter the lug geometry, pin data and load, then run the analysis to display stresses, critical sections and utilizations.
The tool uses simplified nominal-stress models for a flat lifting lug and pin. It does not include the full contact-pressure distribution, stress concentrations unless factors are supplied by the user, plastic deformation, fatigue, fracture, welds, lateral buckling, unequal sling loading or the requirements of specific standards. Verify the results through design calculations for the actual geometry.
Angle: 0 degrees means vertical upward force on the lug axis; a positive angle rotates the vector toward +X as shown in the diagram.
KtNet and KtBase are user inputs. The program does not select concentration factors from charts or standards.
The controlling nominal hole-bearing stress is P/(dh·t), based on the projected hole area. The allowable must use the same definition. P/(dp·t) is shown only as an auxiliary value when clearance exists. Source for the hole-diameter convention.
The optional pin-bending model idealizes the pin as a simply supported beam with a central load: Mmax = P·L/4. It is not a full pin–lug–sling contact model.