Parametric theoretical prediction of elastic properties and strength of fine weave pierced C/C composites

Abstract

This paper developed a parametric model of fine weave pierced carbon/carbon (FWPCC) composites based on the structural relationship of actual sample information. The elastic constants and compressive strengths of FWPCC composites with various Z-directional yarn contents were parametrically investigated. The developed theoretical prediction model agreed well with the experimental data. The parametric prediction results found Z-directional modulus of FWPCC composites with 6 K Z-directional yarns increased by 88.21 % compared to FWPCC composites with 1 K Z-directional yarns; X/Y-directional modulus decreased by 17.32 %; Z-directional compressive strength increased by 337.33 %; X/Y-directional compressive strength only decreased by 6.12 %. The accuracy of the two failure criteria (Hoffmann, Hashin failure criterion) used for the model was compared. The accuracy of the model prediction using Hashin failure criterion was better than that of the Hoffmann criterion. The predicted results using Hashin criterion also showed that under Z-directional compressive loading, the composite failure was mainly the compressive failure of the Z-directional yarns; under X/Y-directional compressive loading, the composite failure was mainly the compressive failure of the fibers in the bending section in the X/Y-directional yarns. The developed theoretical model was of great significance for the engineering application of C/C composite.