Full
Outline
The issues of fiber bridging，crack deflection，and interfacial debonding during the fracture process of long fiber reinforced titanium matrix composites are one of the key concerns in the industry. In this work，the crack propagation behavior， fracture characteristics， and fiber bridging effect of SiCf/TC17 composites under three-point bending fatigue are investigated. The results show that the fatigue crack propagation curve morphology of SiCf/TC17 composites varies significantly under different stress ratios. When the stress ratio R is high，crack arrest occurs after the crack propagates for a certain distance. The trend of crack propagation rate varies under different stress ratios：at R=0.1，the overall propagation rate shows a continuous increasing trend；at R=0.3，the change in propagation rate tends to gradually decrease；at R=0.5，the propagation rate exhibits an overall continuous decreasing trend. The fatigue fracture surface morphology of the material is characterized by an uneven feature，consisting of many different shapes of fracture small planes，with obvious uneven height differences between adjacent small planes. A large number of fibers are in a pulled-out state on the fracture surface， and the fibers exhibit different failure modes during crack propagation. During the fatigue fracture process of materials，the crack deflects to a certain extent when bypassing the fibers. The debonding zone at the fiber/matrix interface extends longitudinally along the fibers，and bridging fibers show secondary fracture. The fiber/matrix debonding occurs at the interface between the matrix and the C coating.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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