Stress tensor components 3D cantilever beam
Hi all,
I do have a question regarding stress tensor components on a 3-D model. The topic is a cantilever beam subjected to a force F at the end of the beam. The beam is a bar with BxHXL dimensions, it's not really important their value but the physics behind its behaviour. At first I ran a linear static analysis, with a MAT1 material type, then a non-linear static analysis with large displacement, since I wanted to see the difference between them. Indeed, using a very low E (let's say 10 MPa) my model needed a non-linear static with large displacement, in order to catch the real behaviour of the cantilever. Now my question is: why there are non zero sigma y in non-linear analysis (and non zero strain y, of course)? In the linear elastic case is obvious, according to the classic theory, however I cannot find an answer in the raising of these sigma y of the tensor components. Is this behaviour a real phenomenon occurring under these particular conditions even in a real experiment? Thanks in advance for any answers.
(Just to clarify, the z-axis is along the beam length, the y-axis is the vertical one and the x-axis is perpendicular to the plane, as in a 2-D cantilever beam. Force is 1000 N, B = 91.287 , H = 109.45 mm, L = 1000 mm)