Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1630463 | Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material | 2008 | 5 Pages |
Abstract
High toughness and reliable three-dimensional needled C/SiC composites were fabricated by chemical vapor infiltration (CVI). An approach to analyze the tensile behaviors at room temperature and the damage accumulation of the composites by means of acoustic emission was researched. Also the fracture morphology was examined by S-4700 SEM after tensile tests to prove the damage mechanism. The results indicate that the cumulative energy of acoustic emission (AE) signals can be used to monitor and evaluate the damage evolution in ceramic-matrix composites. The initiation of room-temperature tensile damage in C/SiC composites occurred with the growth of micro-cracks in the matrix at the stress level about 40% of the ultimate fracture stress. The level 70% of the fracture stress could be defined as the critical damage strength.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Peng Fang, Laifei Cheng, Litong Zhang, Jingjiang Nie,