Damage Evolution and Fracture Behavior of C/SiC Minicomposites with Different Interphases under Uniaxial Tensile Load

Abstract

In this paper, the tensile damage and fracture behavior of carbon fiber reinforced silicon carbide (C/SiC) minicomposites with single- and multiple-layer interphases are investigated. The effect of the interphase on the tensile damage and fracture behavior of C/SiC minicomposites is analyzed. The evolution of matrix cracking under the tensile load of the C/SiC minicomposite with a notch is observed using the digital image correlation (DIC) method. The damage evolution process of the C/SiC minicomposite can be divided into four main stages, namely, (1) an elastic response coupled with partial re-opening of thermal microcracking; (2) multiple matrix microcracking perpendicular to the applied loading; (3) crack opening and related fiber/matrix, bundle/matrix, and inter-bundle debonding; and (4) progressive transfer of the load to the fibers and gradual fiber failure until composite failure/fracture. On the fracture surface, a large number of fibers pulling out of the samples with both single-layer and multi-layer interphases can be clearly observed.

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

“…This feature is not considered in the Tsai-Wu failure criterion used in previous numerical models (see section 3.3), where the failure is assumed to happen at the proportional limit (as a conservative assumption). Progressive degradation models should be then considered for predicting accurately the non-linear post damage evolution until the final fracture [44,45]. Moreover, although the Tsai-Wu criterion -23 - considers the typical orthotropic strength of composites, it cannot distinguish between the different types of composite failures, as observed in this experiment.…”

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

“…3.3), where the failure is assumed to happen at the proportional limit (as a conservative assumption). Progressive degradation models should be then considered for predicting accurately the non-linear post damage evolution until the final fracture [44,45]. Moreover, although the Tsai-Wu criterion considers the typical orthotropic strength of composites, it cannot distinguish between the different types of composite failures, as observed in this experiment.…”

Fabrication process and growth mechanism of novel micro‐stack PyC interphase with different textures

“…The control and adjustment of the PyC interphase have significant effects on the mechanical properties of FRCMCs. For decades, the design strategies of PyC interphase in FRCMCs have mainly focused on adjusting its thickness, 7 heating treatment, 8 multilayer interphase (PyC‐SiC) n , 9,10 or focusing on the novel preparation method, 11,12 and great progress has been made. In addition, the texture control of the PyC interphase is also non‐negligible research method to improving the mechanical properties of FRCMCs compared with the factors mentioned before 13 ;thus, both the fabrication process and texture evolutions of PyC interphase need systematic research.…”