Learning process Posted May 15, 2022 Share Posted May 15, 2022 Hello, Today, I am interested in the handling problem on an assembly consisting of a body and 4 parts serving as feet (on which the assembly rests during conventional use) all fixed to the body by 3 screws. Handling for this assembly is carried out with a handling overhead crane, knowing that the assembly is lying on the side opposite to A to facilitate the handling. There are 2 lifting shackles placed on 2 of the feet of the assembly (positioned on the through and smooth holes of the feet) and 2 slings of 1.5 meters are used to link the 2 shackles and the handling bridge. In addition, 1 other sling of 3 meters makes the link between the bridge and the other part of the sub-assembly, passing through one of the holes in the body and coming out through the other. Thus, during handling, the weight of the assembly (approximately 5 tons) stresses the feet and the upper part of the body where the 3-meter sling passes. My problem is at the feet of the assembly, in fact I want to determine if there is a risk of breakage at the level of the smooth hole. To solve this problem, I thought of 2 solutions : --> Fully model the assembly using Ansys and replace the slings with spring elements of the same stiffness as the slings used --> Only model 1 foot on Ansys and calculate the force (norm and direction) to be applied to the foot. I am interested in the second solution so I am trying to determine by calculation the forces to be applied to the foot on Ansys. Hypotheses : --> The lifting shackles are not taken into account to simplify the calculations and I do not foresee a huge difference in strength with and without. --> The weight applied for each foot is Total weight / 4. Calculation of the forces to be applied on Ansys for the feet alone: y = Angle between F and x p = Angle between AO and z The direction of the force F is the same as that of the sling. Fx=F.cos(y) OA=F.sin(y) Fy=OA.sin(p) Fz=OA.cos(p) Sum of forces on z: Fz=Weight of the assembly/ 4 OA.cos(p)=Weight of the assembly/ 4 F.sin(y).cos(p)=Weight of the assembly/ 4 F=(Weight of set / 4)/(sin(y).cos(p)) I determined the angles y and p with my CAO model but I am not convinced by my determination of the force F according to the known force, i.e. the weight of the assembly. I remain at your disposal for any additional information, thank you in advance. Link to comment Share on other sites More sharing options...

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