Investigation of Statistical Distribution of C/C-SiC Composite’s Mechanical Properties

Abstract

Because of the excellent fracture toughness and oxidation resistance, carbon fiber reinforced silicon carbide (C/C-SiC or C/SiC) exhibits a sound potential in various application areas such as aerospace technology and high-performance braking systems. For the composite’s reliable design, production, examination, quality assurance and verification, however, the statistical distribution of mechanical properties is of crucial interest and has not been investigated in detail yet. In this work, the strength values of C/C-SiC composite, which was developed via Liquid Silicon Infiltration at the Institute of Structures and Design of German Aerospace Center (DLR), were measured under tensile, bending and compression load. The results were analyzed by normal and Weibull distribution statistics and verified by Kolmogorov–Smirnov-test (KS-test) and Anderson–Darling-test (AD-test). Based on the statistical analysis, the 4PB-strength of C/C-SiC composite can be better described by Weibull distribution. In comparison, normal distribution is more suitable for the compression strength. The influence of different numbers of coupons on the mechanical properties has been identified. A scanning electron microscope (SEM) was employed to analyze the fracture surface, which confirmed that the different statistical distribution of strength values was caused by various failure mechanisms.

Experimental evaluation and theoretical prediction of elastic properties and failure of C/C‐SiC composite

“…The error made on this percentage is about 5%-10%.The mineral phase distribution for each of the various failure mechanisms. 13 Hofmann 14 has developed a finite element approach based on the cohesive-zone-elements for the modelling of mechanical behaviors of C/C-SiC with interlaminar defects, which is validated by comparing the numerical and threepoint bending results of delaminated samples. The elastic properties of wound C/C-SiC with different winding angles can be calculated through the input data of equivalent UDply, which was computed by Inverse Laminate Theory.…”

“…The raw materials used in this stud from Zouza member in far north terials were all recognized as ri | 13 SHI et al…”

In situ X-ray tomography characterisation of 3D deformation of C/C-SiC composites loaded under tension

“…Some macroscopic mechanical properties of C/C-SiC material have been studied previously, including the tensile and bending strength in varying loading directions [6] and the damage mechanisms with different fibre architectures through a modal acoustic emission (AE) technique [7]. Different statistical distributions of strength under different loading states have been observed [8] and the effects of temperatures on the mechanical properties have been investigated [9].…”

Manufacture and thermomechanical characterization of wet filament wound C/C‐SiC composites

“…State of the art is the use of commercially available fabrics to manufacture complex shaped CMC components with low porosity in one cycle, providing moderate strength materials, or even lower performance materials based on short fibres applied on cost-efficient components where low strength can be accepted [15][16][17][18] . Characterisation of C/C-SiC composites with respect to thermal and mechanical properties were investigated under different loads and are summarized in 7,[19][20][21][22] .…”

“…[15][16][17][18] Characterization of C/C-SiC composites with respect to thermal and mechanical properties was investigated under different loads and are summarized in previous studies. 7,[19][20][21][22] behavior and the ceramic propert larly in the Sejnène region, northw the chemical composition, these c terized by high iron contents who of the ceramic materials is well k of fluxing agents as alkali and alk are necessary for low temperatur considered materials consist entir containing impurities, mostly ill iron, which serve as fluxing agen at low temperature [3][4][5][6] and appeare physical and mechanical propertie ramic materials.…”