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Content available Effect of material parameters on the cumulative fatigue damage of sonic oscillators
He Shengyu, Bu Changgen, Zheng Xiuhua, Xiao Jing, Kong Xiangzhou
Journal of Theoretical and Applied Mechanics
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2025
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Vol. 63 nr 1
165--175
EN
The standing-wave vibration drill-string in a sonic drill is prone to fatigue damage. Commonly used alloy materials for drill-strings include S135, 4145H and G105, but the material sensitivity coefficient is large when the fatigue strength is high. To choose an appropriate drill-pipe material and improve the drill-string service life, this paper analyzes the cumulative fatigue damage of three types of material drill-strings with variable length. The results indicate that for short drill-strings with high-frequency vibrations, the material constant has a greater effect on fatigue damage. However, for long drill-strings with low-frequency vibrations, the fatigue limit has a greater impact on fatigue damage.
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