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the graph of stress concentration factor K for flat bars with a circular hole geometries are shown in the diagram link below. a load of 50kN is applied to the plate. the width of the plate b=100mm with a thickness of t=10mm

find the maximum stress for the following:

1. plate without hole

2. plate with hole (diameter 50mm)

3. how much is SCF? well k=nominal stress / maximum stress but im not sure how to get the maximum stress, is it s chart or the graph below?

http://imageshack.us/photo/my-images/15/scfvk.jpg/

this is what i have done so:

stress=P/A

p=50X10^3

A=(b-d)h = 50mm x 10mm = 500mmsquared = 0.0005m squared??

so nominal stress is = 50x10^3/0.0005 = 6000???