Design of Ultrasonic Fatigue Sample with Planar Section and Experimental Verification through Fatigue Life Testing
Ultrasonic resonance technology is the most effective method for studying the ultra-high-cy-cle fatigue properties of metallic materials.Ultrasonic fatigue specimens typically need a distinctive geo-metric 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.U-sing GH4169 nickel-based alloy as an example,the proposed plane-featured dog-bone fatigue specimen de-sign 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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