Delaminaiton behavior of spliced Fiber Metal Laminates. Part 2. Numerical investigation

摘要

A strategy is presented for he simulation of delimitation in Fiber Metal Laminates. These composite materials are made of aluminum layers which are connected by either armada or glass fiber reinforced prepare layers. They are modeled using solid-like shell elements in the three-dimensioanl case and plane stress elements of the two-dimensional calculations. Plasticity in the aluminum is modeled with the von Misses yield criterion. Delimitation is modeled by interface elements which are inserted into the FE-mesh at the interface between material layers. For the description of the delimitation in the interface a plasticity based material model is considered. It is derived from a Hoffman-like yield function which bounds all states of stress in the interface. When the state of stress in a material point of the interface reaches the yield surface softening occurs. Then, the stresses are reduced to zero while the inelastic deformations grow significantly. To describe the initialization of mixed-mode delaminating the strengths of the interface for tension, compression and the two shear components are utilized. The growth of the delimitation is controlled by the fracture toughness of the interface. In the limiting cases when the energy dissipated by the inelastic deformations equals the fracture toughness delimitation is completed. For a peel specimen the perform ce of the model is assessed. However, the focus of the paper lies in the comparison of the numerical results with the experimental finding described in Part 1. Hereby, the impact of the fiber orientation in the prepare and