抄録
In this paper, we propose a very useful and simple technique to stabilize the finite element simulations of delamination propagation in composite laminates when using cohesive interface model of comparatively coarse meshes. In this method, the move limit in the cohesive zone is built up to restrict the displacements of upper and lower layers of laminates. A forward Lagrange multiplier method, which is employed to enforce these constraint conditions, is realized in the explicit time integration scheme. The size of the move limit is theoretically discussed. Furthermore, a damping technique for avoiding the numerical instability put forward by other researchers is modified for the explicit time integration scheme and bi-linear cohesive model for composites. The characteristics of these two techniques are examined. Moreover, a DCB problem is employed to illustrate the validity of the present method.
