A neutron diffraction study of load partitioning in continuous Ti/SiC composites
- Cambridge Univ. (United Kingdom). Dept. of Materials Science and Metallurgy
- AECL Research, Chalk River, Ontario (Canada). Neutron and Condensed Matter Branch
Neutron diffraction measurements are described of the internal strain response of Ti-6Al-4V/35 vol.% SiC continuous fiber composites to loading axial and transverse to the fiber alignment direction. In the as-fabricated condition large thermal residual strains are observed, being equivalent to average axial fiber and matrix stresses of {minus}840 and 450 MPa, respectively. As one might expect, upon loading there are marked differences in load sharing according to whether the fibers are parallel or perpendicular to the loading direction. In the former case, load is transferred towards the fibers; a process which is accelerated when the matrix deforms plastically, while in the latter case, load is transferred to the fibers only at very low loads. At higher loads, the process reverses with the reinforcement shedding load back into the matrix. The measurements suggest that this is caused by matrix/fiber interface failure at transverse loads of around 300 MPa. Simple calculations suggest that this would require a non-zero matrix/fiber normal interface strength of around 100 MPa. The measured thermal and load-induced strains are interpreted in the light of Eshelby-based models throughout.
- OSTI ID:
- 302375
- Journal Information:
- Acta Materialia, Vol. 46, Issue 18; Other Information: PBD: 20 Nov 1998
- Country of Publication:
- United States
- Language:
- English
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