I have a simple 110mm long cantilever beam, created in Onshape, and used the technique described here to split the upper and lower faces 10mm from the origin to allow the fixed constraint to be applied on those faces to simulate a clamping force. I also defined 2 additional data points at 40mm and 70mm from the origin (i.e. 30 & 60mm from the clamped edge) to measure the strain on the top surface.
I need to apply a weight of 1kg (Fz = -9.81N) at a point on the top surface 90mm from the clamp, or 100mm from the origin. But I can’t seem to find a combination of distance/face that works. I either get no moment, if I choose face_0 in red above, or, seemingly the wrong moment in that the strain messurements are off by 3 times if I chose face_1 as below. In both cases I get a warning message though the simulation runs and finishes ok. How can I specify this correctly, or do I need to create an artefact in Onshape to apply the force to? If I am doing it right, why are the strain results too low (should be around 1400u and 700u but I’m getting 554u and 224u).