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One of your study applied 2300 kg force and the deflection on the center is 3.6mm, and the Min FOS is 0.37, which means this part will fail.
The low FOS might due to stress concentration.
The stress concentration is because you used very coarse mesh size which cause inaccurate result, I will prefer the mesh size to be half of wall thickness.
BTW, you used solid mesh for this part, since it's a thin wall part with uniform thickness, you may want to consider using shell mesh for better result with smaller mesh size..