1. The problem statement, all variables and given/known data Refer to image attached. Lets say I have a deformable solid that is being accelerated by a force that is equally distributed along the back face of the Main Body that is drawn in the picture. Attached to this Main Body is a Wing. At high accelerations, there will be inertial stresses that reach a maximum at the base of the wing where it is attached to the Main Body. How can I calculate those stresses? I need to find these stresses so that I can determine how large d has to be in order to prevent material failure. I am kind of lost at where to start. 2. Relevant equations 3. The attempt at a solution My attempt: I tried making a cut at the base of the wing (viewed from bottom of the picture shown above) From here I can take sum of the moments to find the bending stress caused by the moment, M. The equation I get is: -M = mwingaw/2. Then I plug into bending stress formula for cantilever beam and compare to the yield stress: |σmax|=|M|d / (2I) ≤ σyield where I = 1/12 L d3 If I solve the equations above for d so that σ does not exceed my yield stress, I end up getting unrealistically small values for d. I don't think my approach is correct because I believe it assumes rigid body acceleration when this is not the case. Maybe there's a continuum mechanics approach that involves solving a differential equation to take into account these inertial stresses of a non-rigid accelerating body. Any help would be appreciated!