Containing Low Velocity Impact Damage Of Composite Laminates Under Compressive Load To Failure Process And The Residual Strength Of Simulation

In this paper, a high-order displacement mode is introdudced. On the base of this mode, an eight-node isoparametric finite element model which could consider the interlamina shear and normal stress of a laminated composite material plate has been developed. Damage analysis could benefit from this element. Damage information is introduced into the finite element above to create a new finite element model. This new element which could consider the damage has a very high flexibility during the damage analysis of laminated structure of composite material. Any damage information could be used as an initialization condition of this element. It also could decide whether any new damage has appeard by using certain damage criterions during the simulation. If so, it could reform its element sitffness matrix to describe new damage conditions. This element makes it possible to continue the simulation without redrawing the mesh of the structure. In this paper, the course of fracture of a laminated plate with a delamination under compress loads is simulated by using the finite element above. And the residual strength of the plate is evaluated. The results of the simulation proved that the finite element has a high precision and efficiency. It could simplify the work of evaluation of the residual strenth considerablely. At the end of the paper, we discussed some factors which effect on the residual strength of the laminated plate with prefabricated delamination damage and draw some conclusions.