Boundary effect analysis and stress calculation of manhole for steel penstocks in Qiapuqihai hydropower station;
压力钢管进人孔边界效应分析与应力计算
To find out the major cause of fractures in sucker rods, we carried out stress calculations of the fractured rods,made some break analysises,metallographic composition assayes and mechanical property determinations,based on the investigations of 19 oil-wells in which sucker rod fractures occurred.
对大庆采油一厂１９口发生抽油杆井中断裂事故油井的井史做了调查，进行了断裂抽油杆的应力计算、断口分析、金相组织分析以及断裂抽油杆材料的机械性能测定。
Due to the existence of the extrusion of longitudinal fiber and the warping of the beam section, the classical bending stress calculation formula can not be adopted simply for deep beam problems.
由于存在纵向纤维挤压和截面的翘曲,深梁不能简单的应用材料力学细长梁的纯弯应力计算公式。
In order to direct the remained ore recovery of pillars and treatment of the mined out area, the secondary stress change of ore pillar and wall rock at 420 and above levels in Suichang Gold Mine of Zhejiang Province is monitored by photoelastic stressmeter, and the long-term monitor-site for stability of mined-out area is established.
采用光应力计监测遂昌金矿 42 0及以上中段矿柱与围岩的二次应力变化 ,建立采空区稳定性长期观测网点 ,以指导矿柱的回收及空区处理。