摘要
连续油管的失效主要是弯曲疲劳失效 ,因此连续油管的疲劳寿命成为衡量其可靠性的关键指标。而连续油管的疲劳是应力状态较复杂的多轴超低循环疲劳 ,目前该疲劳寿命预测理论还很不成熟。笔者在综述了连续油管疲劳研究方法的基础上 ,利用等效应力建立了连续油管的疲劳寿命估计模型 ,得到了一个可应用于油田现场实际的半经验寿命公式 。
The bending fatigue is the main failure of the coiled tubing, so the fatigue life becomes the key index for appraising the coiled tubing's reliability. The coiled tubing fatigue belongs to overlow cycle fatigue at multi axial stress state. The prediction theory of this field is far from complete. The coiled tubing fatigue study method is outlined in this paper. Based on the equivalent stress formula of the coiled tubing, the life prediction model is put forward and a semi empiric formula for prediction is obtained. In the end the model is verified by experimental data.
出处
《青岛建筑工程学院学报》
2001年第1期1-5,共5页
Journal of Qingdao Institute of Architecture and Engineering
关键词
连续油
疲劳寿命
预测
低周疲劳
coiled tubing
fatigue life prediction
low cycle fatigue
