In situ investigation of failure in 3D braided SiCf/SiC composites under flexural loading

Changqi Liu; Yang Chen; Duoqi Shi; James Marrow; Xin Jing; Xiaoguang Yang

doi:10.1016/j.compstruct.2021.114067

In situ investigation of failure in 3D braided SiC_f/SiC composites under flexural loading

Changqi Liu, Yang Chen, Duoqi Shi, James Marrow, Xin Jing, Xiaoguang Yang

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

24 Citations (SciVal)

Abstract

The mechanical failure of three-dimensional (3D) 4-step braided SiC_f/SiC composites, processed by precursor infiltration pyrolysis, has been studied under flexural loading to investigate the condition at failure. The investigation integrated the advantages of continuous data acquisition by optical imaging and 3D reconstruction of internal structure in X-CT imaging, for in situ investigation of microstructure-related failure mechanisms. Optical imaging with digital image correlation acquired the surface displacements. X-ray computed tomographs, obtained in situ, were analysed by digital volume correlation to measure the 3D displacement fields. Image subtraction, informed by the 3D displacements, was used to detect and visualize crack development. Curvature measurement, via the displacement fields, monitored the change in effective flexural modulus. The observed failure modes included matrix cracking, inter- and intra-bundle debonding and fibre breakage. Tensile cracks were arrested by the heterogeneous microstructure, and the ultimate failure under flexural loading was due to multiple cracking in compression.

Original language	English
Article number	114067
Journal	Composite Structures
Volume	270
Early online date	6 May 2021
DOIs	https://doi.org/10.1016/j.compstruct.2021.114067
Publication status	Published - 15 Aug 2021

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China [grant numbers 51772009 and 51911530201 ]. We acknowledge EPSRC Grant EP/M02833X/1 “University of Oxford: experimental equipment upgrade” that supported the Xradia Versa 510 microscope and facilities for data analysis and visualization. The authors want to express their gratitude to Camille Chateau and Michel Bornert from Laboratoire Navier/Ecoles des Ponts ParisTech for the software support relating to image subtraction calculation. The work was conducted at the University of Oxford, with Beihang University support for Liu Changqi as a recognised student. The first and second generation fibres (KD-1 and KD-2) were produced by the National University of Defense Technology, who also provided the Series 1 specimens. The Series 2 specimens were provided by the School of Physics and Nuclear Energy Engineering of Beihang University.

Keywords

Braided composites
Digital image correlation
Failure
Flexural loading
SiC/SiC
X-ray computed tomography

ASJC Scopus subject areas

Ceramics and Composites
Civil and Structural Engineering

Access to Document

10.1016/j.compstruct.2021.114067

https://ora.ox.ac.uk/objects/uuid:44d158ca-1dfe-44b6-80d6-2f8bc82db54a

Cite this

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title = "In situ investigation of failure in 3D braided SiCf/SiC composites under flexural loading",

abstract = "The mechanical failure of three-dimensional (3D) 4-step braided SiCf/SiC composites, processed by precursor infiltration pyrolysis, has been studied under flexural loading to investigate the condition at failure. The investigation integrated the advantages of continuous data acquisition by optical imaging and 3D reconstruction of internal structure in X-CT imaging, for in situ investigation of microstructure-related failure mechanisms. Optical imaging with digital image correlation acquired the surface displacements. X-ray computed tomographs, obtained in situ, were analysed by digital volume correlation to measure the 3D displacement fields. Image subtraction, informed by the 3D displacements, was used to detect and visualize crack development. Curvature measurement, via the displacement fields, monitored the change in effective flexural modulus. The observed failure modes included matrix cracking, inter- and intra-bundle debonding and fibre breakage. Tensile cracks were arrested by the heterogeneous microstructure, and the ultimate failure under flexural loading was due to multiple cracking in compression.",

keywords = "Braided composites, Digital image correlation, Failure, Flexural loading, SiC/SiC, X-ray computed tomography",

author = "Changqi Liu and Yang Chen and Duoqi Shi and James Marrow and Xin Jing and Xiaoguang Yang",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China [grant numbers 51772009 and 51911530201 ]. We acknowledge EPSRC Grant EP/M02833X/1 “University of Oxford: experimental equipment upgrade” that supported the Xradia Versa 510 microscope and facilities for data analysis and visualization. The authors want to express their gratitude to Camille Chateau and Michel Bornert from Laboratoire Navier/Ecoles des Ponts ParisTech for the software support relating to image subtraction calculation. The work was conducted at the University of Oxford, with Beihang University support for Liu Changqi as a recognised student. The first and second generation fibres (KD-1 and KD-2) were produced by the National University of Defense Technology, who also provided the Series 1 specimens. The Series 2 specimens were provided by the School of Physics and Nuclear Energy Engineering of Beihang University. ",

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N2 - The mechanical failure of three-dimensional (3D) 4-step braided SiCf/SiC composites, processed by precursor infiltration pyrolysis, has been studied under flexural loading to investigate the condition at failure. The investigation integrated the advantages of continuous data acquisition by optical imaging and 3D reconstruction of internal structure in X-CT imaging, for in situ investigation of microstructure-related failure mechanisms. Optical imaging with digital image correlation acquired the surface displacements. X-ray computed tomographs, obtained in situ, were analysed by digital volume correlation to measure the 3D displacement fields. Image subtraction, informed by the 3D displacements, was used to detect and visualize crack development. Curvature measurement, via the displacement fields, monitored the change in effective flexural modulus. The observed failure modes included matrix cracking, inter- and intra-bundle debonding and fibre breakage. Tensile cracks were arrested by the heterogeneous microstructure, and the ultimate failure under flexural loading was due to multiple cracking in compression.

AB - The mechanical failure of three-dimensional (3D) 4-step braided SiCf/SiC composites, processed by precursor infiltration pyrolysis, has been studied under flexural loading to investigate the condition at failure. The investigation integrated the advantages of continuous data acquisition by optical imaging and 3D reconstruction of internal structure in X-CT imaging, for in situ investigation of microstructure-related failure mechanisms. Optical imaging with digital image correlation acquired the surface displacements. X-ray computed tomographs, obtained in situ, were analysed by digital volume correlation to measure the 3D displacement fields. Image subtraction, informed by the 3D displacements, was used to detect and visualize crack development. Curvature measurement, via the displacement fields, monitored the change in effective flexural modulus. The observed failure modes included matrix cracking, inter- and intra-bundle debonding and fibre breakage. Tensile cracks were arrested by the heterogeneous microstructure, and the ultimate failure under flexural loading was due to multiple cracking in compression.

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