Time dependent crack growth in ceramic matrix composites with creeping fibers |
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| Affiliation: | 1. Mechanical and Environmental Engineering Department, College of Engineering, University of California, Santa Barbara, CA 93106 USA;2. Rockwell Science Center, 1049 Camino Dos Rios, Thousand Oaks, CA 91360, U.S.A.;1. Department of Avionics, Chinese Flight Test Establishment, Xi''an 710089, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;1. Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi 710049, China;1. Graduate School, Muroran Institute of Technology, 27-1, Muroran, Hokkaido, Japan;2. OASIS, Muroran Institute of Technology, 27-1, Muroran, Hokkaido, Japan;1. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, PR China;2. Shaanxi Key Laboratory of Impact Dynamics and its Engineering Application (IDEA), Northwestern Polytechnical University, Xi’an 710072, PR China;3. Joint International Research Laboratory of Impact Dynamics and its Engineering Application, Northwestern Polytechnical University, Xi’an 710072, PR China;4. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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| Abstract: | Crack growth in ceramic matrix composites with creeping fibers has been investigated using a time dependent bridging law to describe the effect of fibers bridging a matrix crack. The fibers were assumed to creep linearly and the matrix was assumed to be elastic. Time dependent crack growth was predicted assuming that matrix crack growth occurs when the stress intensity factor at the matrix crack tip reaches a constant critical value. Crack growth rates are presented as a function of crack length and time. Domains of stable and unstable crack growth are outlined. The solutions illustrate that stable crack growth consists of a relatively brief period of decerelation followed by acceleration to large crack lengths, with crack velocity approaching constancy only at loads very near the matrix cracking stress and for very long cracks. Finally, the time needed to grow a long matrix crack is compared with a rough estimate for the time needed to rupture fibers. A transition is expected from life dominated by matrix crack growth at low stress to life dominated by fiber creep rupture after crack growth at higher stresses. |
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