An experimental–computational approach to the investigation of damage evolution in discontinuously reinforced aluminum matrix composite
✍ Scribed by M. Li; S. Ghosh; O. Richmond
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 435 KB
- Volume
- 47
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
AbstractÐA combined experimental±computational approach to study the evolution of microscopic damage to cause failure in commercial SiC particle reinforced DRAs is dealt with. Determination of aspects of microstructural geometry that are most critical for damage nucleation and evolution forms a motivation for this work. An interrupted testing technique is invoked where the load is halted in the material instability zone, following necking but prior to fracture. Sample microstructures in the severely necked region are microscopically examined in three dimensions using a serial sectioning method. The micrographs are then stacked sequentially on a computer to reconstruct three-dimensional microstructures. Computer simulated equivalent microstructures with elliptical or ellipsoidal particles and cracks are constructed for enhanced eciency, which are followed by tessellation into meshes of two-and three-dimensional Voronoi cells. Various characterization functions of geometric parameters are generated and sensitivity analysis is conducted to explore the in¯uence of morphological parameters on damage. Micromechanical modeling of two-dimensional micrographs are conducted with the Voronoi cell ®nite element method (VCFEM). Inferrences on the initiation and propagation of damage are made from the two-dimensional simulations. Finally, the eect of size and characteristic lengths of representative material element (RME) on the extent of damage in the model systems is investigated.