How to consider Moment of Inertia as BendStrength in the Bend component

Hello, I found that in the the plate bending, when the “strength” of “hinge” or “angle” component is set as the bending stiffness is EI, and the “strength” of “length” component is EA / L. When the thickness of the plate is in millimeter, the difference between these two “strength” is a multiple of 10e 9, which will directly lead to the fact that the bending simulation of the plate does not conform to the reality. How should this be explained. How can I understand the relationship between “strength” and material stiffness in the physical world. thank you