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I have been a bit stumped on this, but when doing problems about deflection and axial loadings, I am confused when to use which equation.

I think I know that axial member need to be 2 force members, loaded only at the ends, and this means you can useδ=FL/AE. However, I had a problem with two axial bars connected at two ends and it was made clear that I could not use the above equation, but had to useσ=δL/E.

I guess my main question is where do I use which, what exactly is axial loading, and what is statically indeterminate mean does this make it unusable??

Thanks!

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# Force-Deformation Equations Application

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