Subjects: Mechanics >> Other Disciplines of Mechanics submitted time 2023-06-21 Cooperative journals: 《应用力学学报》
Abstract：
A finite element(FE)model is developed for simulating mixed-mode-bending delamination in fiber-reinforced composite laminates.A built-in cohesive zone model based on cohesive elements of the finite element procedure ABAQUS V6.14 is adopted to simulate the mechanical behavior of interfaces between adjacent composite layers.Numerical simulations of mixed-mode-bending specimens were performed using the developed FE model.The predicted load versus displacement curves agree well with their experimental counterparts.The effects of the cohesive zone model parameters and criteria,such as the stiffness of cohesive elements,finite element size,interface failure strengths,fracture energies,and mixed-mode delamination softening law and propagation criterion on the accuracy and convergence of numerical simulations of the mixed-mode-bending specimens,are discussed.The following conclusions can be drawn:proper selection of finite element size can ensure the accuracy of numerical simulations; appropriate choices of the interface cohesive element stiffness and mixed-mode delamination softening law are critical to improving the efficiency of numerical simulations; fracture energy should be sufficiently accurate for ensuring good numerical results; the choice of the interface failure strength has little effects on the simulation results.The choice of the delamination propagation criterion has distinct effects on the efficiency of numerical simulations of the mixed-mode delamination.The research provides a good reference for more effective use of cohesive zone model and cohesive elements.It is helpful for engineers to select relevant cohesive zone model parameters and criteria to ensure the accuracy,computational convergence and efficiency of numerical analysis when encountering computational difficulties in delamination analysis of composite materials.
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