Energy Approach for Prediction of Mechanical Behavior of 2-D Triaxially Braided Composites Part II: Parameter Analysis

Abstract

A 2-arcsmodel of 2-D braided composite is developed. Fiber volume fraction is evaluated by this model and compared with experimental results. Predicted valuesof E_xx, E_yy, ν_xy, and ν_yx by energy approach are compared with results of experiment and other approaches [Reference 1]. Effective stiffness of 2-D braided composite is obtained in a closed form by the analysis of elastic deformation energy in repeat-unit-cell (RUC) of braided composites. Independent parameters of 2-D braided composite are separated from dependent parameters. There are three groups of independent parameters. The first group is yarn geometrical parameters which include filament packing fraction, axial yarn and braiding yarn count number m_a, m_b, filament diameter d_f, yarn thickness to width ratio ξ. The second group is composite geometric parameters which include braiding angle Θ and yarn space L. The last group is material constants which include material constants of both resin and yarn. Three dimensional parameter analysis is done by changing any two parametersof yarn space L, braiding angle Θ, count number of axial yarn ma while all other parametersare kept unchanged.

Keywords

braided composite effective stiffness parameter analysis fiber volume fraction elastic deformation energy

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References

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