Abstract
Pores and damages in the bulk of a two-dimensional plain woven C/SiC composite formed by chemical-vapor infiltration process are characterized in 3D by using X-ray Computed Tomography in order to validate the effectivity of X-ray Computed Tomography to establish the relations between pores and damage mechanisms in the following in-situ tests. An undamaged specimen is examined in order to characterize the pores, and a damaged specimen after a bending fatigue test under 500 °C is examined for the purpose of the characterization of damages. The morphologies of pores and damages are visualized in 3D through a series of 3D digital image processing and analysis. The pores in the undamaged specimen form a highly interconnected plain networks inside SiC matrix between laminates and even connect through several laminates to form a 3D interconnected network architecture. The SiC matrix enclosing the networks of pores could obstruct the contact between the air in the networks of pores and the fiber tows. However, once they are broken under mechanical loadings, the 3D interconnected network architecture may help the contact of air with fiber tows and thus accelerate the oxidations at high temperature. Fiber breaks and matrix breaks are both identified in the fractured area in the damaged specimen. Delaminations and matrix breaks are also observed in the bulk outside the fracture area. Oxidations of carbon fiber tows are not observed obviously under the current test temperature, i.e. 500 °C.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.