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Cantilever beam fracture

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Hi Everybody

I have a question regarding analysis of deflection of the cantilever beam.
As it is clear, If I apply a small force on tip of the cantilever it will deflect. However in simulation I don't know how I can evaluate if the deflection (or applied force) is small enough to avoid fracture (breaking) of the beam. [beam dimensions are as follow: Length 500 to 100 um , width 30 to 50 um, thickness 0.7 um] and the force is in range of 100 pN
Can anybody give me some idea?


-I went through some mechanical books and they said the maximum stress that a material can tolerate before fracture is equal to yield stress (or fracture strength), but i don't know in my simulation I should compare which parameter with yield stress.

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