Abstract
In order to evaluate the role of residual stresses in fracture toughening, a SiC-based particulate composite has been studied under uniform stressing conditions and in the near tip stress field of a pre-cracked specimen. First, residual stresses in a SiC-TiB2 composite before and after stressing have been measured using x-ray diffraction. Tensile residual stresses in the TiB2 drop by 50% after bending stresses of 250 MPa were applied. Likewise, the compressive residual stresses in the SiC phase decrease accordingly. Second, in the near tip stress field, a process zone of microcracks has been measured using transmission electron microscopy of thin foils taken from various locations from a fracture surface of a fracture mechanics specimen. Microcrack zones greater than 150 μm in height have been measured. Crack bridging sites of TiB2 particles operate more than a few millimeters behind a propagating crack. Hence, the toughening in this system is comprised of both stress-induced microcracking and crack bridging. The various contributions to the toughening are discussed.
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Faber, K.T., Gu, WH., Cai, H., Winholtz, R.A., Magley, D.J. (1991). Fracture Properties of SiC-Based Particulate Composites. In: Shah, S.P. (eds) Toughening Mechanisms in Quasi-Brittle Materials. NATO ASI Series, vol 195. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3388-3_1
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DOI: https://doi.org/10.1007/978-94-011-3388-3_1
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