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Ultrasonic resonance technology is the most effective method for studying the ultra-high-cycle fatigue properties of metallic materials. Ultrasonic fatigue specimens typically need a distinctive geometric design to fulfill the resonance requirements. Conventional specimens, such as round rods and dog bones, do not have planar characteristics, making quantitative microscopic characterization difficult. This paper presents an ultra-high-cycle tensile fatigue specimen with a featured plane based on a traditional dog-bone tension-compression specimen design. Different from the traditional specimen design, the dog-bone specimen herein has a flat observation area, readily enabling quantitative microscopic characterization. Using GH4169 nickel-based alloy as an example, the proposed plane-featured dog-bone fatigue specimen design is validated. As expected, the ultrasonic fatigue test results show that the proposed dog-bone plane specimen can resonate at 20 kHz. The measured fatigue life data are basically consistent with available S-N results in the literature. The proposed method provides new ideas for the design of ultrasonic cycle fatigue specimens and helps in the study of micro-deformation mechanisms of ultra-high-cycle fatigue.
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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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