quastion in Cont. Mechanics

On example 10.62  when he calculates d  , total length of the bar , why is he completely ignoring F = 15KN ? Since F is also an Axial force.

Any inputs would be appreciated.

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c_hocklandAsked:
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aburrCommented:
But he does not ignore it. In the equation at the bottom (signaF) it is the first tem after -R

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c_hocklandAuthor Commented:
thats on the FBD.

But my question is when he calculates d = P*L / E*A

where P is the axial force on the rod.
ozoCommented:
where does he calculate d = P*L / E*A?

Was P derived from R, who's equation involved F?
c_hocklandAuthor Commented:
that integral there is d = PL/EA

i dont understand why he drags that 45000 inside the integral.
ozoCommented:
The only integral I see is on Problem 10.61

45000N = (75000 N/m)*0.8m - 15000N
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