| Autor: |
Marek-Jerzy Pindera, Terry S. Davison, Haydn N. G. Wadley |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
Composites Engineering. 4:995-1009 |
| ISSN: |
0961-9526 |
| DOI: |
10.1016/s0961-9526(09)80002-6 |
| Popis: |
The elastic stress field produced in an arbitrarily layered cylinder subjected to diametrically opposed loads is examined and subsequently employed to investigate the transverse strengths of tungsten-cored boron and carbon-cored silicon carbide fibers measured from diametral compression tests. The displacement formulation of linear elasticity and the local/global stiffness matrix method are used to obtain solutions for stress and displacement components in a composite cylinder consisting of annular linear elastic isotropic shells under the assumption of plane strain. It is found that the presence of the carbon and tungsten cores in the ceramic fibers gives rise to a tensile stress concentration at the core/outer shell interface under diametral compressive loading. This is shown to contribute to a significant loss of apparent transverse strength. The solution also provides insight into first-stage consolidation of alloy-coated ceramic fibers. Elevated hoop stresses are shown to occur at fiber-fiber contacts that result in a reduction in the yield coefficient from that of homogeneous alloy fibers. Thus, the initiation of the yield mechanism of consolidation can be accomplished at lower applied loads when a ceramic fiber is present. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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