Modeling of damage in unidirectional ceramic matrix composites and multi-scale experimental validation on third generation SiC/SiC minicomposites |
| |
Institution: | 1. CEA, DEN, DMN, SRMA, 91191 Gif-sur-Yvette Cedex, France;2. Université Paris-Est, Laboratoire Navier (UMR 8205), CNRS, ENPC, IFSTTAR, F-77455 Marne-la-Vallée, France;3. Mines ParisTech, Centre des matériaux (CNRS UMR 7633), BP 87, 91003 Evry Cedex, France;4. Solid Mechanics Laboratory (CNRS UMR 7649), Ecole polytechnique, 91128 Palaiseau Cedex, France;1. University of Dayton Research Institute, Dayton, OH, USA;2. Air Force Research Laboratory, Wright-Patterson AFB, OH, USA;1. CEA, DEN, DMN, SRMA, F-91191 Gif-sur-Yvette Cedex, France;2. Université Paris-Est, Laboratoire Navier, CNRS UMR 8205, ENPC, IFSTTAR, F-77455 Marne-la-Vallée, France;3. Mines ParisTech, Centre des matériaux, CNRS UMR 7633, BP 87, 91003 Evry Cedex, France;1. School of Energy and Power Engineering, Beihang University, Beijing 100083, China;2. School of Power and Energy, Northwestern Polytechnical University, Xi’an, 710072, China;3. Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan, 618307, China |
| |
Abstract: | The purpose of this paper is to experimentally validate a 1D probabilistic model of damage evolution in unidirectional SiC/SiC composites. The key point of this approach lies in the identification and validation at both local and macroscopic scales. Thus, in addition to macroscopic tensile tests, the evolution of microscopic damage mechanisms – in the form of matrix cracks and fiber breaks – is experimentally analyzed and quantified through in-situ scanning electron microscope and computed tomography tensile tests. A complete model, including both matrix cracking and fiber breaking, is proposed on the basis of existing modeling tools separately addressing these mechanisms. It is based on matrix and fiber failure probability laws and a stress redistribution assumption in the vicinity of matrix cracks or fiber breaks. The identification of interfacial parameters is conducted to fit the experimental characterization, and shows that conventional assumptions of 1D probabilistic models can adequately describe matrix cracking at both macro- and microscopic scales. However, it is necessary to enrich them to get a proper prediction of ultimate failure and fiber break density for Hi-Nicalon type S fiber-reinforced SiC/SiC minicomposites. |
| |
Keywords: | Fracture mechanisms Ceramic material Fiber-reinforced composite material In-situ mechanical testing Numerical algorithms |
本文献已被 ScienceDirect 等数据库收录! |
|