Applying a Bending Moment to a Plate with Forces

[SublimeTouch]

I'm using FEA to simulate an in plane bending moment on a plate.

The moment is 200Nm, and the plate is 80mm tall.

Do I simulate the forces on the edge in situation (a) or situation (b)? It's a seemingly simple question, but people have put doubt in my head, I hoped a fresh mind might help. The length of the arrows represents magnitude, the arrow head represents direction. Shown is the right edge of the plate... That should cover everything.

(a)
|---->
|--->
|-->
|->
|<-
|<--
|<---
|<----

(b)
|->
|-->
|--->
|---->
|<----
|<---
|<--
|<-

A swift answer would be massively appreciated. My brain is frazzled right now.

 

[BigSteve]

The first one is the stress distribution of a moment, assuming the directions are correct.
Basically, the stress is greater as you move away from the central axis, and is 0 at the central axis (assuming pure moment).

 

[oswaler]

As a fellow scientist, I understand your need for a clear and definitive answer. In this situation, it is important to consider the direction of the applied moment and the orientation of the plate. If the moment is applied in the same direction as the arrows in situation (a), then this would be the correct representation. However, if the moment is applied in the opposite direction, then situation (b) would be the appropriate choice. It is also important to consider the orientation of the plate, as the forces should be applied perpendicular to the plate's surface. I would recommend double checking your inputs and assumptions to ensure an accurate simulation. Additionally, consulting with a colleague or expert in finite element analysis (FEA) could provide valuable insight and help clarify any doubts. Good luck with your simulation!