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An improved analytical model to predict the response of composite laminate under low velocity large mass impact is proposed. A spring–mass system is used to represent the contact, bending, shear and membrane stiffnesses of the laminate system. The stiffness of the springs is evaluated by dividing the laminate into a central damaged region with degraded stiffness surrounded by an undamaged region....
An elasto plastic damage model for three dimensional Fiber Reinforced Plastic (FRP) composite is proposed to simulate the progressive damage and damaged induced inelastic deformation in case of low velocity impact. Exponential softening model is implemented for damage growth prediction and a three dimensional plastic potential is used for plastic surface growth. An explicit code, VUMAT is written...
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