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- W2331596868 abstract "A simple, computationally effective model for the periodically repeated representative unit cell (RUC) of a two-dimensional triaxially braided composite (2DTBC) is developed. This RUC model has only several hundred degrees of freedom, compared to tens of thousands in other existing formulations. It can capture the effect of the complex meso-structural architecture of braided composites on their elastic stiffness properties. Fracturing of various orientations in the matrix and the fibers, both within and between the tows, can be simulated. Aside from the volume fractions of the polymer matrix and of the axial and braider fiber tows, the RUC model takes into account the angle between the axial tows and the braider tows, the relative amplitudes of the undulations of these tows, and their imperfections, which are features that cannot be captured by the Mori-Tanaka, self-consistent and similar homogenization methods. The RUC is verified and calibrated by the available measurements of stiffness constants of 2DTBC, and is shown capable of matching the measured axial and lateral stiffness moduli as well as the previous calculation of these constants by other methods. It is demonstrated that the model is able to represent the effect of buckling of undulated tows under compression and the fractures caused by buckling-induced out-of-plane tensile and shear stresses. This means that post-peak softening due to both tensile and compression fracturing can be reproduced. Since the RUC size implies a finite material characteristic length of the equivalent macro-scale continuum, the present model is also suitable for size effect simulations. The model is developed using the ABAQUS software, which suits applications in the automobile industry. The interaction between the axial and inclined tows is taken into account using cohesive fracturing conne ctor elements. The tows are discretized using 8-node isoparametric elements. In the elastic range, the material laws for the fiber tows and the matrix in between the axial tows are, respectively, the transversely isotropic elasticity and the isotropic elasticity." @default.
- W2331596868 created "2016-06-24" @default.
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- W2331596868 date "2008-04-07" @default.
- W2331596868 modified "2023-09-28" @default.
- W2331596868 title "Mesomechanical Multiscale Elastic-Fracturing Model for Braided Polymer Composites" @default.
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- W2331596868 doi "https://doi.org/10.2514/6.2008-1932" @default.
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