Hello, and sorry for my English, as I am Norwegian.
I have a statics problem which I can not understand.
I've taken a pic from my book:
The problem asks me to find the largest bending stress, σ
b, in the incisions 1 and 2.
I have the solution in front of me, I just don't understand what they have done with the evenly distributed force (q). Especially in incision 2, when they find M
b, they have used: M
b = F
A*a
A-q*2.5m*1.25.
The q*2.5m I can understand, but where does the 1.25 come from? I thought it should be divided by 2?
Can someone explain how this works for me?