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I often read on books that linear triangles do not have membrane locking for large deformations of plates/shells. I completely don't understand how this is possible. If one uses the well-known CST, stretching is measured as the increase in lenght of each edge of the triangle. Then, in the limit of the membrane stiffness going to infinity, clearly the solution cannot approximate any bending-dominated state, but rather it will be always rigid on general meshes (i.e. Minkowski theorem for convex bodies), allowing at most bending about few lines on very regular ones. What am I missing?

Hello,

I deal with nonlinear behaviour of reinforced concrete structures and masonry structures in my PhD work. I use army manual for defining of pressures of blast load. Now, I want to try model blast load as moving part of air. My problem is, that our university has licence only for ansys, not for ls dyna or autodyn. Do you think, it is possible to model blast wave in ansys flotran? If there is somebody with experience of blast load modeling in ansys flotran, please, I'll be glad for any idea. 

Peter