Shear Failure Behavior of Continuous Fiber Reinforced Ceramic Matrix Composites

Ishiguro, Yohsuke; Akatsu, Takashi; Tanabe, Yasuhiro; Yasuda, Eiki

doi:10.4028/www.scientific.net/kem.164-165.171

Cited by 4 publications

(4 citation statements)

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“…As with the HITCO C/C material, if these values are compared to values of Poisson's ratio for a C/C unidirectional tow obtained by Ishiguro et al, shown in column 3 of Table 6, it ean be seen that the values ealculated by the FE analysis, ef., rows 4-9 of column 3 in Table 4, are reasonable, and aeeurately refiect tbe values of DLR-XT C/C-SiC. Again, it must be noted that the C/C tow analyzed by Ishiguro et al [34] is different to DLR-XT as there is an absence of a secondary SiC matrix, and the fibers may be different; however, a direct comparison between the two materials is still useful.…”

Section: Dlr-xt C/c-sicmentioning

confidence: 88%

“…and 1^13 = 1/23. If these values are compared to values of Poisson's ratio for a C/C unidirectional tow obtained by Ishiguro et al [34], which were estimated from Gipple and Hoyns [35], shown in column 3 of Table 6, it can be seen that the values calculated by the FE analysis for the HITCO C/C tow, given in column 2, are of the same order. It must be noted that the C/C tow analyzed by Ishiguro et al is likely to consist of different constituent materials to the tow analyzed here; however, values of Poisson's ratio given by Gibson [30] suggest that the values of Poisson's ratio for different fibers are relatively similar (typically vio"g = 0.2 and i/".o"j = 0.25) so enabling a direct comparison between the two materials.…”

Section: Dlr-xt Cic-sicmentioning

confidence: 95%

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Initial Elastic Properties of Unidirectional Ceramic Matrix Composite Fiber Tows

Blacklock

Hayhurst

2012

Journal of Applied Mechanics

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The initial elastic properties of two unidirectional ceramic matrix composite tows, comprised of continuous, cylindrical flbers surrounded by one or more matrices, have been calculated using three different methods. The first uses finite element (FE) analysis of the tow to calculate values for elastic and shear moduli and Poisson's ratios in the three principal directions, and in the absence of confirmatory experimental data is regarded as the most accurate for a wide range of fiber/matrix geometries and materials. The other two models are (i) rule of mixtures, ROM/volume averaging and (ii) the approximate equations of Halpin-Tsai and analytical relations based on slab representation for composite materials that rely on the elastic properties and volume fractions of the constituent materials. Initial elastic properties of the tows determined by the FE method are presented, and they are compared with predictions made by the other two techniques.

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Section: Dlr-xt C/c-sicmentioning

confidence: 88%

Section: Dlr-xt Cic-sicmentioning

confidence: 95%

Initial Elastic Properties of Unidirectional Ceramic Matrix Composite Fiber Tows

Blacklock

Hayhurst

2012

Journal of Applied Mechanics

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“…The calculations associated with the predictions of Figure 13 have been carried out using an Excel spreadsheet with input parameters c , g, and d. From the literature a value of d ¼ 0:9 mm has been selected. An initial value of c ¼ 10 MPa has been taken from Ishiguro et al 29 Since no values of the interfacial shear failure stress Weibull index, g, are available in the literature, a value of g ¼ 20 has been obtained for the DLR-XT material by a trial and error process to achieve a good quality visual fit for the experiment data of Figure 13. This process has been repeated by fixing the value of g and varying c ; in this way the predicted curve of Figure 13 has been obtained for c ¼ 11:75 MPa.…”

Section: Thermal Behavior Of Woven Composites With Dlr-xt Towsmentioning

confidence: 99%

Stress—strain response and thermal conductivity degradation of ceramic matrix composite fiber tows in 0—90° uni-directional and woven composites

Tang

Blacklock

Hayhurst

2010

Journal of Composite Materials

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The physical model for tow behavior, developed previously by the authors, is used to study the performance of two woven CMC laminates: a carbon fiber/carbon—SiC matrix (C/C—SiC) plain weave laminate — DLR-XT; and a carbon fiber— carbon matrix (C/C) 8-Harness Satin weave laminate — HITCO. For both materials, room temperature stress—strain curves and transverse thermal conductivity—strain curves are available from a previous experimental investigation; these curves have been used as benchmarks to assess the fidelity of the models. The tow model has first been used to develop relationships for 0°/90° uni-directional unit cells, and then adapted to cater for unit cells of the DLR-XT and HITCO woven composites. For both materials, acceptable predictions have been made of stress—strain behavior. Despite the thermal models being based on one-dimensional heat flow, within series-parallel elements, excellent predictions have been made of the degradation in transverse composite thermal conductivity with the composite strain. Furthermore, it has been confirmed that the effect of the degradation of transverse thermal conductivity is due to strain-driven growth of wake debonded cracks.

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“…There are many types of experimental techniques for measuring the mechanical strength of joints at high temperatures: (1) tensile or bending tests to mea-sure the tensile strength of joints, (2) single-& double-lap joint tests, (3) double-notch shear in compression tests, or (4) asymmetrical four-point bending tests to measure the shear strength. [9][10][11] Among these methods, the asymmetrical bending test seems to be most economical due to the requirement of small test specimens with simple geometry.…”

Section: Introductionmentioning

confidence: 99%

FEM Analysis of Asymmetrical Bending Test for Smart Materials Joints

2002

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SiC/SiC composites with a thermal coating have been developed as smart composites for high temperature applications, where the joint techniques are indispensable for constructing large scale structures due to the fabrication and economical reasons. Since one of the important issues is the establishment of a design database for the joint strength, the testing method has to be carefully selected based on the theoretical background. In this study, the stress distribution of a SiC/SiC composite specimen containing a butt joint consisting of reaction-formed silicon carbide tested by the asymmetrical four-point bending test was precisely analyzed by the finite element method as a means to evaluate the applicability of analytical results. In the case without the effect of the thermal residual stresses, the shear stress distribution at the interface between the base and the joint almost agreed with the analytical theory. For the case with the residual stress, however, the shear stress near the surface was very large and the possibility of an initial crack induced by the residual stress was considered. Moreover, it was found that the residual shear stress distribution near the surface was significantly affected by the joint thickness.

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Shear Failure Behavior of Continuous Fiber Reinforced Ceramic Matrix Composites

Cited by 4 publications

References 0 publications

Initial Elastic Properties of Unidirectional Ceramic Matrix Composite Fiber Tows

Initial Elastic Properties of Unidirectional Ceramic Matrix Composite Fiber Tows

Stress—strain response and thermal conductivity degradation of ceramic matrix composite fiber tows in 0—90° uni-directional and woven composites

FEM Analysis of Asymmetrical Bending Test for Smart Materials Joints

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