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Indentation strength method to determine the fracture toughness of La0.58Sr0.4Co0.2Fe0.8O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-δ

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Abstract

The temperature-dependent fracture toughness of brittle ceramics can be conveniently assessed from bending tests of specimens with defined cracks introduced by indentation. However, the validity of this indentation strength in bending method (ISM) depends critically on the correct consideration of the residual stress induced by the indentation process. The ISM has been applied to La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF) and, for comparison, on Ba0.5Sr0.5Co0.2Fe0.8O3-δ (BSCF) perovskite. LSCF with rhombohedral phase exhibits ferro-elastic behavior at ambient temperature, whereas BSCF deforms linear-elastically. Pre-indented specimens of both perovskites were fractured at room temperature in biaxial bending, some of them after an additional annealing step. The fracture toughness values of BSCF match reasonably well when determined with equations which consider the presence or absence of residual indentation stress. Interestingly, annealing has little influence on the apparent toughness results obtained for rhombohedral LSCF, which appears to be related with stress relaxation by ferro-elastic deformation.

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Acknowledgements

Financial support from the Federal Ministry of Economics and Technology via the MEM-OXYCOAL project (grant no. 0327803) is gratefully acknowledged. The authors would like to thank Dr. Wessel for his valuable support with SEM characterization.

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Authors and Affiliations

  1. Forschungszentrum Jülich GmbH, IEK-2, 52428, Jülich, Germany

    B. X. Huang, R. W. Steinbrech & J. Malzbender

  2. Mechanical Engineering Department, Jadavpur University, Kolkata, 700032, India

    A. Chanda

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  1. B. X. Huang
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  2. A. Chanda
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  3. R. W. Steinbrech
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  4. J. Malzbender
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Correspondence to J. Malzbender.

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Huang, B.X., Chanda, A., Steinbrech, R.W. et al. Indentation strength method to determine the fracture toughness of La0.58Sr0.4Co0.2Fe0.8O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-δ . J Mater Sci 47, 2695–2699 (2012). https://doi.org/10.1007/s10853-011-6095-2

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  • DOI: https://doi.org/10.1007/s10853-011-6095-2

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