The stress map is the part you see, but it comes last. A serious FEM check is decided earlier: in how we build the model and apply the loads.
1. From 3D to calculation model
We start from your model, STEP or native. We remove what doesn't carry load (screws, fillets, holes), turn thin sheets into surfaces and decide how to represent the connections.
A bolt can be a contact, a beam or a rigid link. That choice weighs on the results more than the mesh does, and we write it in the report.
2. Loads and restraints
Loads come from the standard. For a lift sling, the EN 81-50 cases: operation, safety gear, unbalanced load, test load if required. For a structure carrying the lift: permanent, lift and seismic loads to the Italian NTC 2018.
Restraints copy the real mounting. A guide rail isn't a fixed support, a guide shoe doesn't transmit moment.
3. What we look at
- Stressescompared with the limits of the standard. A peak at a corner isn't a failure: we read it together with the mesh.
- Deformations: in a sling they matter as much as stresses, the car must stay in its guides and the doors must close.
- Stabilityof the uprights in compression on safety gear operation, with the method of the standard.
- Connections: bolts and welds checked separately, with the forces from the model.
4. The report
We write it for whoever reads it: notified body, technical office, your client. It covers assumptions, materials, loads, restraints, mesh and the results of each case compared with the limits.
If the part doesn't pass we tell you, and we tell you what to change: a thickness, a stiffener, one more bolt.
Timing
For a component with the 3D ready, from a few days to two weeks. For a product family we set up the model once and repeat it per size, as with the XF slings.