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Stress along a Beam 
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#1
Feb2307, 07:32 PM

P: 22

I am using a cantilever beam, guided on one end and fixed on the other, (example 1b from Roark's Formulas for Stress and Strain), I have included the page from the book as an attachment.
I want to determine an equation for the stress along the top of the beam. The beam is 250 mm long, 3 mm high, 25 mm deep. The modulus of elasticity E is 68927 N/mm^2 The moment of inertia I is 56.25 mm^4 a = 0 From what I have been able to determine stress = (M*c)/I where M is the bending moment, c is the distance from the neutral axis to the proper fibers (therefore this is half of the height, 1.5 mm), and I is the moment of inertia. The bending moment is outlined in the attached file Is this correct or am I taking the wrong approach? I appreciate any help. 


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