Microplane Model for Inelasticity and Fracture of Transversely Isotropic Polymer Composites F. C. Caner1,2,∗, S. Sabounchi1 1 Institute of Energy Technologies, Technical University of Catalonia, Barcelona 08019, Spain 2 Department of Materials Science and Engineering, Technical University of Catalonia, Barcelona 08019, Spain ∗ ferhun.caner@upc.edu Keywords: Microplane inelasticity, Microplane fracture, anisotropic polymer composite A new microplane model based on cylindrical geometry in which the cylinder axis coincides with the longitudinal direction is developed for a general 3D inelastic fracturing analysis by finite element method of transversely isotropic fiber reinforced polymer composites. Most models available in literature do not address the 3D general loading. Furthermore, they remain in the mesoscale which makes large scale finite element calculations impossible. The proposed model bridges the mesoscale material behavior to macroscale behavior using the stress equilibrium developed for cylindrical geometry. To this end, Microplane level stress–strain relations for tension, compression and shear for both longitudinal and transverse directions are formulated to optimally fit experimental data [1]. An explicit algorithm is formulated and coded into a VUMAT user subroutine for use with commercial finite element software ABAQUS. The model is suitable for the analysis and design of large structures made of fiber reinforced polymer composites unlike the competing mesoscale models. A detailed algorithm for the calibration of the model is identified using the common test data available in the literature. The predictive capacity of the model is demonstrated by comparing the model predictions against test data in (i) longitudinal tension, (ii) lateral tension, (iii) longitudinal compression, (iv) lateral compression and (v) longitudinal shear. In addition, rare size effect test data that includes the post-peak fracture of multilaminate composite is used to test the predictive capability of the proposed model. References [1] Sabounchi, S. and Caner, F. C (2022). Microplane model of cylindrical geometry for transversely isotropic polymer composites. Computers & Structures, 268, 106807 39
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