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Gwozdzilla
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Homework Statement
Two beams of different cross sectional areas are fused together to create a single beam, as shown in the figure above. The following relationships apply: A1 = 2A2, L2 = 2L1, E1 = 3E2. A tensile force F is applied at the ends of the bar, as shown. What is the ratio of the stress in beam 1, σ1, to the stress in beam 2, σ2?
Homework Equations
stress = σ = F/A0
strain = ε = ΔL/L0
σ = Eε
The Attempt at a Solution
σ1 = F/A1 = F/(2A2)
σ2 = F/A2
σ1/σ2 = 1/2
I think that my answer is probably wrong because I don't think that the force being applied to the beam should just be equal to F. Is the force at the location of fusion different from F that's being applied at both ends? How would I go about calculating this force? Would this make the F in the formula for stress an average of F and the stress at the fusion point?