Understanding Stress: 75/Area vs 125/Area and (QA)

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SUMMARY

The discussion clarifies that the normal stress is calculated as 75/Area rather than 125/Area due to the directional nature of the loads applied. The 75 lb load acts along the y-axis, contributing to axial stress, while the 125 lb load acts along the x-axis, resulting in bending and shear stresses without contributing to axial stress. The distinction between these loads is crucial for accurate stress analysis in engineering applications.

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  • Knowledge of load types: axial, bending, and shear
  • Familiarity with coordinate systems in mechanics
  • Basic principles of structural analysis
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Solidsam
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The problem

Why is the normal stress 75/Area and not 125/Area. They are both acting on the same axis so how do I know which one to choose?

And what does (QA) mean?
 
Last edited:
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hard to say without more context.
 
I linked the problem and how it's solved, you must have missed it so here it is again
BNJJF.png
 
The 75 and 125 lb loads are not acting along the same axis. The 75 lb load is in the direction of the y axis, and the 125 pound load is along the x axis. Only the 75 pound load contributes to the axial stress along the shaft. The 125 pound load produces bending and shear stresses, but not axial stresses.
 
They're not acting along the same axis.
 

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