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Calculate normal stress in simply supported beam, with known section modulus, due to bending caused by 2 symmetrical point loads.
Section modulus of the beam
$$ W_{y_{section}} = 10000 \:
mm^3 $$
Bending stress
$$ \sigma_{bend_{2p}} = {10 ^ 3 \cdot {M_{B_2p} \over W_{y_{section}}}} \:, MPa $$