应用修正的P-S-N曲线计算齿轮疲劳寿命

疲劳破坏是机械结构的主要破坏形式之一,准确预测机械结构工作疲劳寿命至关重要.一般的线性损伤累积理论忽略了高频率低疲劳应力所引起的构件疲劳损伤,致使预测结果与实际寿命相差很大.为准确确定双圆弧齿轮的疲劳寿命,提出以修正的材料P-S-N曲线为基础,采用传统的名义应力法和Miner法则估算双圆弧齿轮的疲劳寿命,计算结果表明该方法可行,为预估螺杆泵的井下工作寿命提供了参考依据.

The estimation of gear's fatigue life using the modified P-S-N curve

The fatigue breakage is one important of damage style in mechanic fractures.Forecasting structure fatigue life is very important.But the common linear fatigue damage cumulative rule neglects the fatigue damage which is brought by the high frequency and low stress.Based on modified P-S-N curve,traditional nominal stress method and Miner's rule,estimate the fatigue life of double-circular-arc gear,and the conclusion shows that the method is practical and provides the theoretical reference for forecasting the crew pump's fatigue life.