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Calculate normal stress in simply supported beam due to bending caused by single force.
Section modulus of the beam
$$ W_{y_{section}} = 10000 \:
mm^3 $$
Bending stress
$$ \sigma_{bend_{p_{max}}} = {10 ^ 3 \cdot {M_{B_{p_{max}}} \over W_{y_{section}}}} \:, MPa $$