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Principle of virtual work
(1) Principle of virtual work statement can be said as:
"Virtual work = Work done by real forces in moving through virtual displacements
= (Real Force) * virtual displacement
Therefore, the equation of virtual work that you get is:
F * du = (K*u) * du (where, du is the virtual displacement and u is real displacement, and Ku is the real internal force and F is the real external force)
(2) However, I was going through the lecture notes of Duke university, we have at the following URL:
"In other words, the external virtual work of a virtual force ( F ) moving through a real displacement (D ) equals the integral of the virtual stresses associated with F times the real strains associated with D , over the volume of the solid.
That is, in the proof provided he considers "virtual forces" and "real displacement"?
Am I ineterprating wrong anywhere?
(3) I shall be extremely grateful if you can lead me where I am going wrong.Please help - whether it should be "Real Foces x virtual displacement or Virtual forces x Real displacement? whether (1) or (2) is correct?
with warm regards,