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## Homework Statement

Hi guys,

I have a question here, which asks me to express the maximum stress from my simply supported beam, which I worked out to be 1.165MPa, to be expressed as a percentage of the Yield strength 95MN/m^2.

I also have a follow on from that which asked me how much the cross-sectional wall thickness must be increased by so that the max stress is 40% of the yield strength.

Could someone else explain how to work this out to me please?