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It seems that yield strength for 4130 chromoly steel has been approximated as 460 MPa for MSXII

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Minimum Combined Stress Results

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Comments: Max strength seems to be 909 MPa, but that is at a very small point very close to the collision object. The stress might be on the collision object itself. The rest of the Chassis seems to be in a cool blue region which can go up to 300 MPa

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Maximum Combined Stress Results

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