摘要
研究核电站直管道在恒定内压和循环位移作用下的棘轮效应,分析了内压、循环位移和多步载荷对内压管道棘轮应变的影响.结果表明:最大棘轮应变发生在直管的环向方向,轴向棘轮应变与环向棘轮应变相比小得多.在相同内压下,棘轮应变随着循环位移的增大而增大;在相同位移下,棘轮应变随内压的增大而增大.采用多步加载时,前一步棘轮变形会降低后一步应有的棘轮应变率,尤其前一步具有较大的位移作用下发生棘轮应变后,这种现象十分明显.根据直管试验装置特点,确定了内压直管在位移控制下的棘轮边界.
The ratcheting effect of pressurized straight pipe was studied for nuclear power plant.The effect of internal pressure, displacement and multistep loading on ratcheting strain was mainlystudied. Th e results indicated that ratcheting strain occurs mainly in hoop direction and itrs notevident in axial direction. Ratcheting strain increases with the increasing of displacement at thesame pressure. At the same displacement,ratcheting strain increases with the increasing of internalpressure. For multi-step loading, ratcheting strain rate in the next step would be decreased byratcheting deformation in the preceding step. Th e effect of ratcheting history at higher levelloading on ratcheting strain is larger than that at lower level loading. According to the quasi-threepoint-bending apparatus, ratcheting boundary was determined.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第7期990-993,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(51435012)
东北大学秦皇岛分校博士基金资助项目(XNB2015001)
河北省高等学校科学技术研究项目(QN2015336)
中央高校基本科研业务费专项资金资助项目(L1523001)
关键词
压力直管
位移控制
试验研究
棘轮应变
棘轮边界
pressurized straight pipe
displacement control
experimental study
ratchetingstrain
ratcheting boundary
