Aerospace Structures: WINGBOX (Case 1: Aluminum Wing without Ribs) Abaqus Standard

Pay attention to the Von Mises Stress. It should be less than your Yield Stress. That is why I had to increase the thickness section up to 0.1m. TIt is so high because we are applying the Forces to a small wing. In your case, you have yo apply the force into a 15m wing, and, as the Total Force is the same, the peak of the lift force is much lower.