Densification of metal coated fibers by elastic-plastic contact deformation
| Autor: | Haydn N. G. Wadley, Joseph M. Kunze, Terry S. Davison |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Materials science
Consolidation (soil) Mechanical Engineering Plasticity Hot pressing Industrial and Manufacturing Engineering Contact mechanics Mechanics of Materials visual_art Volume fraction Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material Contact area Near net shape |
| Zdroj: | Composites Part B: Engineering. 28:233-242 |
| ISSN: | 1359-8368 |
| DOI: | 10.1016/s1359-8368(96)00044-3 |
| Popis: | Near net shape titanium and nickel matrix composites can be produced by the hot isostatic/vacuum hot pressing of alloy coated ceramic fibers. During the initial stage of consolidation, densification occurs by the inelastic deformation of metal-metal contacts. When the temperature is low and the consolidation pressure is high, the dominant mechanism of contact deformation is matrix plasticity. This densification process is investigated by analysing the elastic-plastic contact deformation of aligned fibers. Applying a methodology developed for modelling the consolidation of alloy powders and spray deposited composite monotapes, a contact yield criterion has been proposed and used to predict the dependence of the relative density upon process conditions and matrix mechanical properties. The resulting densification model contains unknown plastic flow (F) and contact area evolution (c) coefficients. A deformation theory elastic-plastic finite element analysis of a representative coated fiber unit cell loaded in compression is used to find these coefficients. The analysis shows the ceramic fiber significantly constrains plasticity in the alloy coating resulting in fiber volume fraction dependent coefficients and a fiber volume fraction dependent density-pressure relationship for coated fiber consolidation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect