Lecture 19 - summary Displacement vector Strain tensor ξ r = ξ r0 + ξ r S ε=ε0 + ε S Decomposition into beam reference axis and section r From displacement in beam reference axis, 0( x ) : Navier-Bernoulli assumption (N-B): An initially plane beam section which is perpendicular to the beam reference axis remains plane throughout the beam deformation and perpendicular to the beam’s axis in the deformed configuration. S r 1 st consequence r
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