Where are shear loads mainly present on a wing?

Shear loads are primarily concentrated in the center section of the main spar of a wing due to the distribution of aerodynamic forces acting on the structure during flight. As the aircraft operates, the wings are subjected to various forces, including lift and weight, as well as drag. These forces create bending moments and shear forces within the wing structure.

The main spar acts as the primary load-bearing component of the wing, transferring these loads throughout the wing and into the aircraft fuselage. In particular, the center section of the main spar experiences significant shear loads because it is where the loads from both the wing and the fuselage converge. The structural design is optimized in this area to handle high shear stresses, which are critical for overall wing integrity and safety.

While there are shear loads at other locations, such as the wing tip and wing root, they are not as predominant as those found in the center section of the main spar. Additionally, shear loads near fuel tank locations are influenced by the distribution of fuel and other factors, but they do not experience the same intensity or significance as at the center of the main spar.