| 凿岩机活塞疲劳寿命的理论分析 |
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| 引用本文： | 宋守志.凿岩机活塞疲劳寿命的理论分析[J].东北大学学报(自然科学版),1993(1). |
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| 作者姓名： | 宋守志 |
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| 作者单位： | 东北工学院采矿系 |
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| 摘 要： | 根据赫兹接触应力理论,对活塞疲劳失效进行了破坏机理的讨论,指出距冲击接触表面深度约为二分之一接触圆半径处,由于出现最大剪切应力,此处便形成了裂纹源;分析了影响疲劳裂纹扩展速度的重要因素;提出了活塞接触疲劳寿命的理论估算方法。
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| 关 键 词： | 凿岩机 活塞疲劳 疲劳寿命 疲劳强度 |
Theoretical Estimate for Fatigue Life of Pistons in Rock Drill |
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| Song Shouzhi.Theoretical Estimate for Fatigue Life of Pistons in Rock Drill[J].Journal of Northeastern University(Natural Science),1993(1). |
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| Authors: | Song Shouzhi |
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| Institution: | Song Shouzhi |
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| Abstract: | Based on the contact stress theory by Hertz,the malfunctioning or failure mechanism of a piston in rock drill due to fatigue is discussed. It is found that a crevice source will take place in a depth of about one-half radius of contact circle under the initial compact surface, where the maximum shearing stress occured. Main factors influencing the propagating rate of fatigue crevice are discussed with an estimate method of piston fatigue life under impact loading theoretically derived. |
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| Keywords: | rock drill piston fatigue fatigue life fatigue strength |
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