SAE J1078:2020 pdf free

SAE J1078:2020 pdf free.(R) A Recommended Method of Analytically Determining the Competence of Hydraulic Telescopic Cantilevered Crane Booms
The equations presented in this analysis are based on laterally unsupported beam column formulas, the solution of which are combined in interaction equations. In determining the section properties, the effective width of the plates in compression are used. The areas covered in this analysis consist of axial and torsional loading, bidirectional bending, and panel buckling.Of primary importance in the analysis are the compressive stress calculations.
The work of this committee is not intended to cover all design concepts, but rather a basic system. However, other design configurations may use alternative calculation methods when substantiated with suitable test data.
Wind force is uniformly distributed along the exposed length of the side of the section with its reaction at the center (is a valid assumption since each section considered individually).
That the dimensions are to the reaction points and that the tips of each section beyond these points are small in length and will not affect the validity of the equations.
Calculations shall include the dead weight loads, rated load, and a minimum side load of 2% of the rated load at the rated load radius. The side load provides for “normal” conditions of machine operation. In addition, the effect of the wind on the boom should be considered, as is provided for in the calculations.
That the axial stresses produced by the friction forces due to the section reaction points from one to the next are small in comparison to the other stresses, that the section support cylinders carry the axial loads.
That equations and formulations appearing in the foregoing analysis are for the boom in the extended position-Figures 1, 2, 3, 4, 5, 6, and 7. Partially retracted positions will require reformulation of some equations; as an example, in Figure 4 when 11 is zero or negative, the cylinder no longer takes the axial load at the section being considered. The moment equations would then appear as those witten for reference Figure 3. Similar changes would appear in the axial load, reactions, and shear force equations.SAE J1078 pdf free download.