The bending moment equation is, M/I = f/y= E/R,
Where,
M – Bending moment (M is in N-mm)I - Moment of inertia about centroidal axis (I is in mm?)f – Bending Stress (f is in N/mm²)y - Distance from neutral axis (y is in mm)E - Young’s modulus (E is in N/mm²)R - Radius of curvature (R is in mm)   _{Your Comment}