Maximum stress as percentage of Yield Strength

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SUMMARY

The maximum stress calculated for the simply supported beam is 1.165 MPa, which is approximately 1.23% of the yield strength of 95 MN/m². To achieve a maximum stress of 40% of the yield strength, the cross-sectional wall thickness must be increased significantly. The calculations indicate that the current wall thickness is insufficient to meet this requirement, necessitating a reduction in the maximum stress to reach the desired percentage of yield strength.

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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?

Homework Equations

The Attempt at a Solution

 
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You will first have to show how you calculated the max stress. Your numbers show that max stress is only about 1% of yield stress, so wall thickness would decrease to get max stress of 40% yield. Please show your work.
 

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