Analysis of failure mechanisms of Oxide - Oxide ceramic matrix composites

Karthik Ramachandran; Subhashree Leelavinodhan; Christian Antao; Antony Copti; Cantalapiedra Mauricio; Yelisetti Lakshmi Jyothi; Doni Daniel Jayaseelan

doi:10.1016/j.jeurceramsoc.2021.11.020

Analysis of failure mechanisms of Oxide - Oxide ceramic matrix composites

Karthik Ramachandran, Subhashree Leelavinodhan, Christian Antao, Antony Copti, Cantalapiedra Mauricio, Yelisetti Lakshmi Jyothi, Doni Daniel Jayaseelan

Kingston University

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

24 Citations (Scopus)

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Abstract

The failure mechanisms of Oxide-Oxide ceramic matrix composites AS-N610 were studied at both room temperature and high temperature using tensile and fatigue tests with and without lateral and laminar notches. The unnotched coupons had an average tensile strength of 423 MPa with elastic modulus of 97 GPa at room temperature showing a perfect elastic behaviour whereas the laminar notched samples shown similar strength of 425 MPa with elastic modulus (98 GPa) revealing pseudo-ductile behaviour. A reduction in tensile strength of the oxide ceramic matrix composites was observed at high temperatures. Thermal shock experiments revealed that the retained strength of the samples quenched from 1100 °C deteriorated by ∼10 % (395 ± 15 MPa). In all samples, fracture origin was observed on the mid-plane showing a higher degree of fiber pull-out, delamination and pseudo ductile behaviour. Finite element analysis confirmed higher stress concentration on the areas of failures.

Original language	English
Pages (from-to)	1626-1634
Number of pages	9
Journal	Journal of the European Ceramic Society
Volume	42
Issue number	4
Early online date	13 Nov 2021
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2021.11.020
Publication status	Published - Apr 2022
Externally published	Yes

Bibliographical note

Funder

Authors would like to thank Dr Anish Paul, Ansaldo Energia, Switzerland for providing oxide CMC samples for research. The authors acknowledge the support of Mr. Dean Wells and Mr. Alex Vine from Kingston University, London and Mr. Collin Small and Mr. Martin Bache from Swansea University for their assistance offered towards mechanical testing. One of the authors, Karthikeyan would like to acknowledge the support provided by Kingston University, London for the studentship towards his PhD research

Keywords

Ceramic matrix composites
Failure mechanisms
Tensile behaviour
Fatigue behaviour
High temperature testing
Finite element analysis

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10.1016/j.jeurceramsoc.2021.11.020Licence: CC BY-NC-ND

PublishedFinal published version, 6.43 MBLicence: CC BY-NC-ND
1-s2.0-S0955221921008189-mainFinal published version, 6.08 MBLicence: CC BY-NC-ND

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title = "Analysis of failure mechanisms of Oxide - Oxide ceramic matrix composites",

abstract = "The failure mechanisms of Oxide-Oxide ceramic matrix composites AS-N610 were studied at both room temperature and high temperature using tensile and fatigue tests with and without lateral and laminar notches. The unnotched coupons had an average tensile strength of 423 MPa with elastic modulus of 97 GPa at room temperature showing a perfect elastic behaviour whereas the laminar notched samples shown similar strength of 425 MPa with elastic modulus (98 GPa) revealing pseudo-ductile behaviour. A reduction in tensile strength of the oxide ceramic matrix composites was observed at high temperatures. Thermal shock experiments revealed that the retained strength of the samples quenched from 1100 °C deteriorated by ∼10 % (395 ± 15 MPa). In all samples, fracture origin was observed on the mid-plane showing a higher degree of fiber pull-out, delamination and pseudo ductile behaviour. Finite element analysis confirmed higher stress concentration on the areas of failures.",

keywords = "Ceramic matrix composites, Failure mechanisms, Tensile behaviour, Fatigue behaviour, High temperature testing, Finite element analysis",

author = "Karthik Ramachandran and Subhashree Leelavinodhan and Christian Antao and Antony Copti and Cantalapiedra Mauricio and Jyothi, {Yelisetti Lakshmi} and Jayaseelan, {Doni Daniel}",

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AU - Ramachandran, Karthik

AU - Leelavinodhan, Subhashree

AU - Antao, Christian

AU - Copti, Antony

AU - Mauricio, Cantalapiedra

AU - Jyothi, Yelisetti Lakshmi

AU - Jayaseelan, Doni Daniel

PY - 2022/4

Y1 - 2022/4

N2 - The failure mechanisms of Oxide-Oxide ceramic matrix composites AS-N610 were studied at both room temperature and high temperature using tensile and fatigue tests with and without lateral and laminar notches. The unnotched coupons had an average tensile strength of 423 MPa with elastic modulus of 97 GPa at room temperature showing a perfect elastic behaviour whereas the laminar notched samples shown similar strength of 425 MPa with elastic modulus (98 GPa) revealing pseudo-ductile behaviour. A reduction in tensile strength of the oxide ceramic matrix composites was observed at high temperatures. Thermal shock experiments revealed that the retained strength of the samples quenched from 1100 °C deteriorated by ∼10 % (395 ± 15 MPa). In all samples, fracture origin was observed on the mid-plane showing a higher degree of fiber pull-out, delamination and pseudo ductile behaviour. Finite element analysis confirmed higher stress concentration on the areas of failures.

AB - The failure mechanisms of Oxide-Oxide ceramic matrix composites AS-N610 were studied at both room temperature and high temperature using tensile and fatigue tests with and without lateral and laminar notches. The unnotched coupons had an average tensile strength of 423 MPa with elastic modulus of 97 GPa at room temperature showing a perfect elastic behaviour whereas the laminar notched samples shown similar strength of 425 MPa with elastic modulus (98 GPa) revealing pseudo-ductile behaviour. A reduction in tensile strength of the oxide ceramic matrix composites was observed at high temperatures. Thermal shock experiments revealed that the retained strength of the samples quenched from 1100 °C deteriorated by ∼10 % (395 ± 15 MPa). In all samples, fracture origin was observed on the mid-plane showing a higher degree of fiber pull-out, delamination and pseudo ductile behaviour. Finite element analysis confirmed higher stress concentration on the areas of failures.

KW - Ceramic matrix composites

KW - Failure mechanisms

KW - Tensile behaviour

KW - Fatigue behaviour

KW - High temperature testing

KW - Finite element analysis

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Analysis of failure mechanisms of Oxide - Oxide ceramic matrix composites

Abstract

Bibliographical note

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Keywords

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