Browsing by Author "Eskandari, Sina"
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Item Open Access Analyzing the failure and damage of FRP composite laminates under high strain rates considering visco-plasticity(Elsevier, 2019-03-19) Eskandari, Sina; Andrade Pires, Francisco M.; Camanho, Pedro P.; Cui, Hao; Petrinic, Nik; Marques, Antonio T.In order to analyze composite structures under dynamic condition or model manufacturing processes in which high strain rates exist, it is important to develop a constitutive model that regards these effects. In this work, a phenomenological approach is used to formulate a continuum damage for composites in presence of high strain rates. Visco-plastic behavior of the composite is taken into account and the deformation of composite structures under dynamic conditions is studied. Effects of dynamic conditions on the material properties including strength and fracture toughness are included in the modeling. The model can capture the effects of strain rate on material behavior and has a good capability in the prediction of the response and final strength of composite laminates in comparison with the experimental data under medium and high rates.Item Open Access A critical study on impact damage simulation of IM7/8552 composite laminate plate(Elsevier, 2019-01-25) Cui, Hao; Thomson, Daniel; Eskandari, Sina; Petrinic, NikPlate impact tests on IM7/8552 composite laminates with different projectile 10 incident angles and velocities were carried out. Numerical simulations were conducted to 11 predict the impact damage, with both Puck and LaRC failure criteria having been employed in 12 this study. The dynamic failure performance of IM7/8552 lamina was reviewed first, by 13 referring to data obtained from experiments conducted at a range of strain rates. The 14 performance of the assessed modelling approaches was evaluated by comparing the results 15 of simulations against experimentally (quantitatively and qualitatively) acquired projectile 16 velocity, impact load and the failure modes of the plates. It proved to be challenging to model the macroscopic damage of the laminate at elevated projectile velocities; further 18 improvement can be made through enriching the dynamic material data and mitigating the 19 mismatch between the complex fibre architecture and its numerical representation.