Abstract: A large number of investigation on fracture toughness andon mechanical properties forsucker rod of 35 Mn2 steel,and the reliability analyses have been made this paper.It is verified that the distribution of all parameters:σ_s,σ_b,Ψ,δ and K_1c is normal. We have also determined the point estimation and the region estimation of parametsrs for every distribution.This study provided the evidence for reliability assessment of parts and defects of sucker rod.

Key words: sucker rod, fracture toughness, mechanical properties, normal distribution, rehability

摘要： 对抽油杆材料35Mn2钢的机械性能和断裂韧度进行了大量的实验研究,并进行了可靠性分析.认为σ_s,σ_b,Ψ,δ均服从正态分布.对各参数进行了点估计和区间估计.为对抽油杆各部位、各种缺陷进行可靠性评定提供了依据.

关键词: 抽油杆, 断裂韧度, 机械性能, 正态分布, 可靠性