theory.pdf

节选段落一：
This
section discusses the co-rotational formulation, since the formulation is most easily
described for a beam element, and then describes the beam theory used to formulate the
co-rotational beam element.
4.1 Co-rotational Technique
In any large displacement formulation, the goal is to separate the


节选段落二：
The Belytschko-Lin-
Tsay shell element uses the Mindlin [1951] theory of plates and shells to partition the
velocity of any point in the shell as
v v z em= − ×$ 3 θ (6.6)
where vm is the velocity of the mid-surface, θ is the angular velocity vector, and $z is the
distance along the fiber direction (