Abstract: This paper presents a computational method for selecting a better joint structure at the joints of FRP(fiber reinforced plastics or fiberglass) sucker rod string in design.B_y calculting two typical contact states of the joint structure the distributions of displacements and stresses at the contact surface of the joint structure under the action of the maximum operating load and the condition of running and pulling the sucker rod have been obtained.The calculated results show that different technical measures taken in two typical structures give rise to the same effects,i.e.the uniformity of the displacement and stress distribution and the improvement of the reliability of the structures.This is of great significance in the selection of FRP sucker rod joint structure.The use of finite element method in computation has the following advantages:adaptability,less computer time,easier convergence in calculation etc.,and the method is theoretically rigorous.The method presented in this paper might be applied to other contact problems in large engineering structures.

摘要： 本文在FRP(纤维增强塑料——俗称“玻璃钢”)抽油杆头部联接结构的选型设计中,采用有限元计算方法,比较了两种典型结构的接触状态,得到了在最大工作载荷作用下及抽油杆起下作业时,沿联接结构接触面上的位移分布曲线和应力分布曲线.计算结果表明:这两种典型结构采用不同的技术措施,都可以使应力、位移分布均匀,提高联接结构的工作可靠性,达到同一效果.这对FRP抽油杆的设计选型具有重要意义.本文用有限元法求解上述接触问题,所用的求解方法具有适用性强,运算量节省、并有严格的理论证明,保证算法迭代过程收敛性等优点.该方法同时适用于求解其它各种类型大型工程结构中的接触问题.

关键词: 抽油杆, 有限元方法, 接触问题, 联接结构, 接触边界, 位移分布, 技术措施, 最大工作载荷, 工作可靠性, 设计选型