The axial compressive failure of titanium reinforced with silicon carbide monofilaments
Journal Article
·
· Acta Materialia
- Cambridge Univ. (United Kingdom). Dept. of Materials Science and Metallurgy
Monofilament-reinforced titanium has been subjected to compressive loading, with a range of angles between the fiber axis and the loading direction. Under axial loading, the failure stress is about 4 GPa, which is well below levels predicted for kink band formation. It is proposed that compressive failure occurs under these circumstances by the crushing of individual fibers. A model is proposed for prediction of the composite strength as controlled by this mechanism. Observed strengths are consistent with monofilament crushing stresses of about 8--10 GPa. Composites were also studied after a post-consolidation heat treatment and with weak fiber-matrix interfacial bonding. In both cases, slightly higher compressive strengths were recorded than for the standard material. These increases are attributed to an enhanced matrix yield stress and to a higher monofilament compressive strength, respectively. Under off-axis loading, strengths fell from about 4 GPa at low misalignment angles to just above 1 GPa at an angle of 16{degree}. A transition occurs between fiber crushing at low angles and kink band formation at higher angles. The transition range is around 3--4{degree}, which is consistent with model predictions. Microstructural studies confirmed that the expected failure modes were operative in these two regimes.
- OSTI ID:
- 329063
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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