INDICATORS FOR THE DAMAGE EVOLUTION AT INTERMEDIATE TEMPERATURE UNDER AIR OF A SIC/[SI-B-C] COMPOSITE SUBJECTED TO CYCLIC AND STATIC LOADING

38th International Conference on Advanced Ceramics and Composites (ICACC), Daytona Beach, FL, JAN 26-31, 2014; International audience; The low density and the high tensile strength of Ceramic Matrix Composites (CMC) make them a good technical solution to design aeronautical structural components. To fully understand damage mechanisms and be able to design components, its behavior has to be analyzed during fatigue tests. The aim of the present study is to compare behavior of this composite under static and cyclic loading. Tests are realized under the same conditions of temperature and maximal load levels in order to determine the effects of cycles on the sequence of damage mechanisms. Hence the evolution of mechanical parameters is analyzed. Nevertheless the complexity of mechanisms and duration of tests make the use of complementary damage indicators necessary. Different approaches based on acoustic emission can be taken into consideration in order to quantify damage along the tests. In this case the analysis of acoustical energy is studied by comparing to the evolution of strain energy. This method enables to point out different damage levels during tests.