A Three-Dimensional Ply Failure Model for Composite Structures

International Journal of Aerospace Engineering (Impact Factor: 0.48). 08/2009; 2009. DOI: 10.1155/2009/486063
Source: DOAJ


A fully 3D failure model to predict damage in composite structures subjected to multiaxial loading is presented in this paper. The formulation incorporates shear nonlinearities effects, irreversible strains, damage and strain rate effects by using a viscoplastic damageable constitutive law. The proposed formulation enables the prediction of failure initiation and failure propagation by combining stress-based, damage mechanics and fracture mechanics approaches within an unified energy based context. An objectivity algorithm has been embedded into the formulation to avoid problems associated with strain localization and mesh dependence. The proposed model has been implemented into ABAQUS/Explicit FE code within brick elements as a userdefined material model. Numerical predictions for standard uniaxial tests at element and coupon levels are
presented and discussed.

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    • "Experiments were developed separately to determine ply fracture energies, for which no standard tests currently exist [23] [26]. An explicit damage model for high velocity applications was developed by Raimondo et al. [27] [28], while Donadon et al. [29] [30] formulated a nonlinear shear law including gradual stiffness reduction and used an objectivity algorithm to obtain characteristic lengths in non-structured meshes. The explicit damage model developed here incorporates physically-based failure criteria, a nonlinear shear law and a crack band model to mitigate mesh sensitivity. "
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