Size Effect of Strength for SiC/SiC Composites: Experimental Study and Theoretical Analysis

Zhang, Sheng; Meng, Weikang; Gao, Xiguang; Song, Yang; Zhang, Zhiguo

doi:10.1007/s10443-021-09915-w

Cited by 2 publications

(4 citation statements)

References 38 publications

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“…In particular, to justify the necessary modeling of matrix damage and gas-induced expansion, which have not been considered in the literature, two reduced simulations were used for comparison: simulations with an intact matrix (both matrix damage and gas-induced expansion are excluded) and only matrix damage (gas-induced expansion is not included). The reduced simulation with an intact matrix is similar to that reported in the literature [13,23].…”

Section: Experimental Validationssupporting

confidence: 80%

“…The simulation with only matrix damage provided a good prediction for IP strain but predicted a TTT strain of −7.7%, which is significantly different from the experimental data. When both matrix damage and gas-induced expansion were excluded, similar to the previous models [13,23], the predictions of the IP and TTT strains differed significantly from the experimental data.…”

Section: Experimental Validationsmentioning

confidence: 53%

“…Chen et al [22] considered the thermal expansion mismatch between the fiber and the matrix during the processes, and predicted the stress distribution inside plain-woven CMCs using finite-element (FE) calculations. Zhang et al [23] studied the effects of thermal expansion and chemical shrinkage on the deformation of CMC structure using FE simulations.…”

Section: Introduction mentioning

confidence: 99%

“…First, variations in the physical and mechanical properties of the matrix have not been formulated well. Especially, there is a debate on the volume change of the matrix during pyrolysis; some studies modeled it as volume shrinkage [23,24], and the others as positive thermal expansion [13,22]. Second, these existing models cannot predict the formation of process-induced defects.…”

Section: Introduction mentioning

confidence: 99%

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Modeling of the process-induced stress, damage, microstructure, and deformation evolution during the pyrolysis process manufacturing CMCs

Liu,

Ma,

Yuan

et al. 2023

Journal of Advanced Ceramics

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An insightful understanding of the formation mechanism of process-inherent defects and deformation is increasingly important for the property evaluation and structural design of ceramic matrix composites (CMCs). For this purpose, a coupled thermal-diffusive-mechanical modeling approach was proposed by considering three important phenomena that occur during the pyrolysis process for manufacturing CMCs: variations of the physical and mechanical properties of the constituents, generation and diffusive of pyrolysis gas, and multiple thermal deformations. The synergistic effects of these three phenomena on the stress, damage development, microstructural morphology, and process deformation of SiC matrix composites were investigated using finiteelement simulations. This new approach was validated by comparing the simulation and experimental results. Significant volume shrinkage of the matrix during the polymer-to-ceramic transformation resulted in large tensile stresses and subsequent highly fragmented microstructure in CMCs. The pyrolysis-gas-induced expansion on the matrix under a damage state may yield a positive process deformation of CMCs at the macroscale, overcoming the effects of the volume shrinkage of the bulk matrix at the microscale. The modeling approach is expected to guide high-quality manufacturing of CMCs and comprehensive studies of structure-processing-property relationships.

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Section: Experimental Validationssupporting

confidence: 80%

Section: Experimental Validationsmentioning

confidence: 53%