Modeling stress-dependent matrix cracking and stress–strain behavior in 2D woven SiC fiber reinforced CVI SiC composites

Morscher, Gregory N.; Singh, Mrityunjay; Kiser, James D.; Freedman, Marc R.; Bhatt, Ramesh S.

doi:10.1016/j.compscitech.2006.06.007

Cited by 120 publications

(57 citation statements)

References 8 publications

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“…The size of the specimens used for the oxidation tests was º15 © 2 t mm 3 . The bulk density and open porosity of the Monolith calculated using the Archimedes method were 7.71 g/cm 3 and 0.2%, respectively. Figure 1 shows the X-ray diffraction (XRD) pattern and electron probe micro analysis (EPMA, JXA-8800RL, JEOL Ltd., Japan) results for the Monolith after SPS.…”

Section: Fabrication Process Of Monolithmentioning

confidence: 99%

“…The preforms were subsequently covered with Si8.5 at%Hf alloy, powder (<50 mesh, Rare Metallic Co., Ltd., Japan) and heated in a carbon crucible at 1390°C for 15 min under vacuum. The surfaces of the composites were then ground to remove excess alloy and the final size of the specimens used for oxidation testing was 20 l © 4 w © 3 t mm 3 . The bulk density of the composites and their open porosity, determined using the Archimedes method, were 2.94 g/cm 3 and below 1%, respectively.…”

Section: Fabrication Process Of Sic F /Sicsmentioning

confidence: 99%

“…The composites fabricated using the SiHf alloy showed 37% higher bending strength than the composites fabricated by the conventional MI process using Si. 7), 8) SiC f /SiCs fabricated by the low-temperature MI process using a eutectic SiHf alloy are expected to be among the materials recommended for use in turbine blades in jet engines due to their low specific weight (³3 g/cm 3 ). In addition, Okubo et al and Aoki et al reported that SiC f /SiCs using the Si8.5 at%Hf alloy showed excellent heat resistance at above 1300°C and a melting point of 1390°C.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxidation behavior of monolithic HfSi<sub>2</sub> and SiC fiber-reinforced composites fabricated by melt infiltration using Si–8.5 at%Hf alloy at 800–1200°C in dry air

Tsunoura

Okubo

Yoshida

et al. 2018

J. Ceram. Soc. Japan

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The low-temperature melt-infiltration method using eutectic Si alloys is a novel process of fabricating SiC fiberreinforced SiC-based matrix composites (SiC f /SiCs) for high-temperature structural applications. SiC f /SiCs were fabricated by the melt-infiltration method using a eutectic Si8.5 at%Hf alloy to evaluate their dry oxidation behavior at 8001200°C for times ranging from 10100 h. The oxidation behavior of monolithic HfSi 2 (Monolith) fabricated by spark plasma sintering was also evaluated in dry air. The oxidation behavior of the composite matrix and Monolith obeyed the parabolic law in dry conditions. The steps to form the oxidation layer were expected to produce HfO 2 and Si, followed by SiO 2 , and, finally, HfSiO 4 . The oxidation rate of the matrix was similar to that of Monolith and 10 2 10 4 times larger than that of Si. The oxidation activation energy employed in oxidation of HfSi 2 was calculated as 258 kJ/mol in dry air.

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Section: Fabrication Process Of Monolithmentioning

confidence: 99%

Section: Fabrication Process Of Sic F /Sicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation behavior of monolithic HfSi<sub>2</sub> and SiC fiber-reinforced composites fabricated by melt infiltration using Si–8.5 at%Hf alloy at 800–1200°C in dry air

Tsunoura

Okubo

Yoshida

et al. 2018

J. Ceram. Soc. Japan

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“…no inflexion was found for 3 k C/SiC. It was pointed out early that the cumulative AE energy is in direct relation to the number of matrix cracks [18,19], therefore, the 1 k C/SiC is more prone to reach the state of matrix cracking saturation than 3 k C/SiC, namely the mechanical behavior of the present 1 k C/SiC can be referred to as intermediate behavior, i.e. in the transition from brittle to tough behavior [20,21], and is closer to tough behavior than that of 3 k C/SiC.…”

Section: Resultsmentioning

confidence: 91%

Effect of Yarn Sizes on the Tensile Damage Evolution of a C/SiC Composite Fabricated by Chemical Vapor Infiltration

Zhang

Cheng

2010

Appl Compos Mater

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The damage evolutions of C/SiC composites fabricated by chemical vapor infiltration with two different sizes of yarns were compared by cyclic tensile load/unload tests accompanied with the acoustic emission (AE) monitoring. The results show that an inflexion was observed in both the evolution of hysteresis characteristics and the corresponding AE curve for composite with fine yarns, which is, however, absent for composite with coarse yarns, suggesting that the former is much closer to the tough material than the latter one. Felicity effect was observed for both composites, which is more pronounced for the composite with coarse yarns due to the large yarn sizes leading to more matrix debris inside the yarns.

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“…The saturation matrix crack spacing of 2.5D C/SiC composite is estimated of the same value of 2D C/SiC composite. Morscher et al [45] performed an investigation on the quasistatic loading/unloading cyclic tensile behaviour in 2D SiC/SiC composite. Under tensile loading, the acoustic emission method can be used to monitor the matrix multicracking evolution.…”

Section: D and 25d Cmcsmentioning

confidence: 99%

Micromechanical Modeling for Tensile Behaviour of Carbon Fiber − Reinforced Ceramic − Matrix Composites

2015

Appl Compos Mater

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The stress-strain curves of fiber − reinforced ceramic − matrix composites (CMCs) exhibit obvious non-linear behaviour under tensile loading. The occurrence of multiple damage mechanisms, i.e., matrix multicracking, fiber/matrix interface debonding and fibers fracture, is the mainly reason for the non-linear characteristic. The micromechanics approach has been developed to predict the tensile stress-strain curves of unidirectional, cross-ply and woven CMCs. The shear-lag model was used to describe the micro stress field of the damaged composite. The damage models were used to determine the evolution of micro damage parameters, i.e., matrix crack spacing, interface debonded length and broken fibers fraction. By combining the shear-lag model with damage models and considering the effect of transverse multicracking in the 90°plies or transverse yarns in cross-ply or woven CMCs, the tensile stress-strain curves of unidirectional, cross-ply, 2D and 2.5D woven CMCs have been predicted. The results agreed with experimental data.

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Modeling stress-dependent matrix cracking and stress–strain behavior in 2D woven SiC fiber reinforced CVI SiC composites

Cited by 120 publications

References 8 publications

Oxidation behavior of monolithic HfSi<sub>2</sub> and SiC fiber-reinforced composites fabricated by melt infiltration using Si–8.5 at%Hf alloy at 800–1200°C in dry air

Oxidation behavior of monolithic HfSi<sub>2</sub> and SiC fiber-reinforced composites fabricated by melt infiltration using Si–8.5 at%Hf alloy at 800–1200°C in dry air

Effect of Yarn Sizes on the Tensile Damage Evolution of a C/SiC Composite Fabricated by Chemical Vapor Infiltration

Micromechanical Modeling for Tensile Behaviour of Carbon Fiber − Reinforced Ceramic − Matrix Composites

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