Fig 2 - uploaded by Mohammad Hadi Safari Naderi
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The 3PB load-displacement obtained by simulation of three 47-layer laminates with different supports spans.
Source publication
The inconsistencies accompanied with material properties tipically cause the rise of delamination risk in composites made of different types of glass and crabon fibers. In this study, the delamination of a composite beam reinforced with a carbon layer under bending load is investigated. To this end, a small piece of a wind turbine blade root in the...
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... examined. To this end, three samples with lay-ups similar to the first 47 layers of the blade root with support spans of U= 30, 50 and 90 mm are considered for the analyses. Assuming elastic properties for the material, the simulation results are supposed to be linear. Fig. 1 represents the mesh pattern used in finite element solutions of Abaqus. Fig. 2 illustrates the results of such simulations in which the curves are protracted until the criterion of damage initiation is carried ...
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Citations
... Ghasemi and Mohammadi-Fesharaki [33] used the energy method and a micromechanical model to determine the distortion of asymmetrical composite laminates. Safari Naderi et al. [34] utilized experimental and numerical models to investigate the delamination in a composite laminate beam under bending loads. Mobarakian et al. [35] studied the deformation of thin unsymmetric polymer composite laminates in the cure process and the effects of changing cooling rates on their distortion. ...
An experimental and semi-analytical study of distortion of asymmetric composite laminates with different cooling rates and lay-ups has been presented. In this study, thermomechanical constitutive equations of thin composite laminates are developed using basic viscoelastic constitutive law considering chemical and thermal effects with time-temperature dependent material properties. To solve a fully scouple problem, both the thermochemical and thermomechanical constitutive equations are formulated. The general heat conduction equation known as the Fourier-Biot equation, viscoelastic laws, Boltzmann superposition principle and composite equations are utilized to formulate thin composite laminates. A static model with constant properties in ambient temperature and a transient model by obtaining constitutive equations are simulated. Results are compared with experimental data. Changing lay-up from cross-ply to angle-ply and then quasi isotropic will increase the value of maximum distortion. Results indicated that the increasing cooling rate will increase the value of the maximum distortion. The differences between FEM results with static analysis of different lay-ups and experimental specimens that cooled in the oven, environment and refrigerator is about 3%, 35% and 55% respectively. The differences between FEM simulation with transient analysis of different lay-ups and experimental specimens that cooled in the environment and the refrigerator is less than 9%.
