Abstract
A finite element approach based on experimental material data is presented in order to compute the mechanical reliability of carbon fibre reinforced silicon carbide, C/C-SiC, taking interlaminar manufacturing defects into account. The approach is evaluated on sample scale by modelling the flexural behaviour of C/C-SiC samples containing delaminations after liquid silicon infiltration (LSI) processing. The non-destructive evaluation methods, determination of fracture mechanical input data and the numerical cohesive zone approach are described. The numerical predictions of flexural stiffness and strength of samples with and without interlaminar defects were validated by bending tests of the respective samples. The difference between tensile and bending behaviour is explained by FE modelling for this group of CMC materials.
Highlights
A finite element approach based on experimental material data is presented in order to compute the mechanical reliability of carbon fibre reinforced silicon carbide, C/CSiC, taking interlaminar manufacturing defects into account
The approach is evaluated on sample scale by modelling the flexural behaviour of C/C-SiC samples containing delaminations after liquid silicon infiltration (LSI) processing
Delaminations are the most common interlaminar defects observed in carbon fibre reinforced silicon carbide, C/C-SiC, produced by liquid silicon infiltration (LSI) process
Summary
Delaminations are the most common interlaminar defects observed in carbon fibre reinforced silicon carbide, C/C-SiC, produced by liquid silicon infiltration (LSI) process. The strong matrix shrinkage in contrast to the stable fibres always produces the risk of delamination due to differences in out-of plane and in-plane shrinkage during pyrolysis of the polymer green body. The risk increases with the complexity of the curved structure and for small scale series production where lay-up and processing may not be optimized to the very end due to cost issues.
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