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

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
48 Downloads (Pure)

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 languageEnglish
Pages (from-to)1626-1634
Number of pages9
JournalJournal of the European Ceramic Society
Volume42
Issue number4
Early online date13 Nov 2021
DOIs
Publication statusPublished - Apr 2022
Externally publishedYes

Bibliographical note

© 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license

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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