| Citation: | SHI Duoqi, HAO Wenqi, LIU Changqi, et al. Study on tensile properties of SiCf/TC17 composites and strength analysis of blade-ring structure[J]. Journal of Aerospace Power, 2025, 40（7）：20230626 doi: 10.13224/j.cnki.jasp.20230626
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Longitudinal tensile tests were carried out on SiCf/TC17 composites at room/high temperature to investigate the tensile behaviors. The damage evolution and failure mechanisms were revealed based on microscopic fracture morphology analysis. Afterwards, a constitutive model was developed to describe the tensile behaviors of SiCf/TC17 composites. The results showed that the ultimate tensile strength of SiCf/TC17 composites decreased with the increasing temperature, while the nonlinear segment of the stress-strain curve increased. The major failure mechanisms at room temperature (25 ℃) lied in multiple fractures of the interfacial reaction layer and random breakage of weak fibers, whereas large-scale interface debonding and fiber pullout, matrix cracking and fiber breakage were more common at high temperatures. The results of different strength-predicted models demonstrated that the failure mode of SiCf/TC17 composites at 25 ℃ was controlled by local loading sharing, while the high-temperature ultimate tensile strength was more consistent with the global loading sharing model. The stress-strain curve of SiCf/TC17 composites was simulated by the proposed constitutive model with coupling fiber cumulative damage. The simulation results exhibited a trend similar to that of the experimental data at 25 ℃ and 450 ℃. Finally, based on the tensile properties obtained from the tests, finite element stress-strain analysis and static strength calibration of the TMCs blade-ring structure were carried out. The result indicated that the blade-ring structure exhibited a significantly elevated strength reserve factor at the typical service temperature.
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