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。
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.
基金
国家自然科学基金
关键词
凿岩机
活塞
疲劳
疲劳寿命
rock drill,piston fatigue,fatigue life,fatigue strength.
