I have drawn a bicycle crank arm

I would like to study what happens to the crank arm when a pressure is applied by the pedal

I would then like to remove material from crank arm to see if i can lighten it, and what affect that would have on where the crank fractures and how much deviation would occur

I have used solidowrks motion before but i dont seem to be able to get desired affect

Could some one give me a list  or any help to achieve this