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I am wondering how to properly go about calculating the stresses caused by bending on an angled flat plate. Two approaches seem valid but they give much different results:

-Calculate the new area moments of inertia for the angled flat plate (new Ixx, ymax).

-Resolve the moments into parallel and perpendicular components, then add the calculated stresses from the principal area moments of intertia (Ixx, Iyy).

I wrote a short script to compare the resulting stresses from these two methods and they give answers that are different by one or two orders of magnitude. The first method gives lower stresses (more stiff).

I cannot reason how which method is right. I do believe the second method is right, but I cannot explain why the first method is wrong. I know I am missing something with the first method.

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# Beam bending of an angled flat plate

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