The push bound problem is a very interesting one. When we push at a plate, sometime all of the plate goes ahead, sometime some place bounds. C. V. Coffman and R. J. Duffin, R. J. Duffin and P. R. Garabedian did some good work in this field. Here, what we are considering is, for square plates, when we push at a given point, which points will bound. Using
difference method and MATLAB, we deal with common material (like glass, steel, ...) and composite material square plates.