摘要
采用数值模拟的方法建立了含初始缺陷的受限衬管失稳力学模型,重点研究了受限衬管的临界失稳载荷和后屈曲构型之间的相互作用行为,并讨论了临界失稳载荷的缺陷敏感性,最后通过试验验证了仿真结果的计算精度。结果表明,相对于衬管半径1%幅度的内衬不圆度缺陷会使内衬的临界失稳载荷下降约65%;在相同的初始椭圆度缺陷δ_(0)前提下,随着内衬径厚比的增大,其临界失稳载荷不断减小;复合管内衬临界失稳载荷的有限元计算结果与试验结果的相对误差为1.82%。建立的平面应变有限元力学模型不仅可以准确求解出受限内衬的临界失稳载荷,还能够大量节约试验成本。
The instability mechanical model of confined liner pipe with initial defects was established by means of numerical simulation,the interaction behavior between critical instability load and post-buckling configuration of confined liner pipe was studied emphatically,and the defect sensitivity of critical instability load was discussed.Finally,the calculation accuracy of the simulation results was verified by tests.The results show that the non-roundness defect of liner with the amplitude of 1%relative to the liner pipe radius can reduce the critical instability load of liner by about 65%;with the premise of the same initial ellipticity defectδ_(0),with the increase of the diameter-thickness ratio of liner,its critical instability load decreases constantly;the relative error of critical instability load of composite pipe liner between the finite element calculation results and the test results is 1.82%.The established plane strain finite element mechanical model not only can solve the critical instability load of the confined liner,but also save a large number of test cost.
作者
谷天平
练章华
王斌
史君林
陈俊文
GU Tian-ping;LIAN Zhang-hua;WANG Bin;SHI Jun-lin;CHEN Jun-wen(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Xi′an Sunward Aeromat Co.,Ltd.,Xi′an 710025,China;China Petroleum Engineering&Construction Corporation Southwest Company,Chengdu 610041,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第2期177-184,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金面上资助项目(51974271)
中石油CPECC项目(CPECC2019KJ13)。
关键词
双金属衬里复合管
内衬失稳
临界失稳载荷
有限元
bimetallic lined composite pipe
liner instability
critical instability load
finite element
