Let width b, depth h, length l and elastic modulus e = 200000, then

Deflection: d=(FL? )/(48EI)

Moment of inertia: I=(bh? )/ 12

σ=(F/2*L/2*h/2)/I

Solution:

F=(4bdh？ E)/L？

σ=(6dhE)/L？

Because we don't know the deformation, we can't give a specific value. We can calculate it ourselves and see the σ value. If this value exceeds the yield strength (200MPa), the actual loading force is less than the theoretical value.