I am not familiar with Cauchy stress. What other options for stress plots do you have ? Are you able to plot the inplane shear stress and the inplane direct stress in the spanwise direction ? That would be more useful .....

I would be careful relying on FEA results in this area of the structure, expecially as we know there is buckling occuring, unless you are running the nonlinear solver and you have included geometric nonlinearities in the solution. This is the only way that the buckling behaviour of that D box skin and flanges can be calculated .... and you will need a very fine mesh to get an accurate result, particularly as the leading edge skin will buckle on the compression side at low stress levels and you will need to continue the solution into the post buckling regime. If you are running the linear static solver remember that the analysis is based only on the initial geometry and cannot predict buckling and cannot calculate the load redistribution that occurs at loads higher than that at which the buckling occurs. A linear buckling solver can predict the load at which the buckling first occurs but is no use here because we are interested in the post buckling strength.

I would be careful relying on FEA results in this area of the structure, expecially as we know there is buckling occuring, unless you are running the nonlinear solver and you have included geometric nonlinearities in the solution. This is the only way that the buckling behaviour of that D box skin and flanges can be calculated .... and you will need a very fine mesh to get an accurate result, particularly as the leading edge skin will buckle on the compression side at low stress levels and you will need to continue the solution into the post buckling regime. If you are running the linear static solver remember that the analysis is based only on the initial geometry and cannot predict buckling and cannot calculate the load redistribution that occurs at loads higher than that at which the buckling occurs. A linear buckling solver can predict the load at which the buckling first occurs but is no use here because we are interested in the post buckling strength.

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