在内压和弯曲载荷下钢管临界屈曲应变的确定  

Determination of critical buckling strain for steel pipe under internal strength and bending loads

作　　者：孙彦彦[1] 李昕[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《油气储运》2013年第9期1022-1026,共5页Oil & Gas Storage and Transportation

基　　金：新世纪优秀人才支持计划资助项目"腐蚀缺陷位于焊缝位置的深水海底管道破坏机理研究";NCET-11-0051;国家重点基础研究发展计划(973计划)"深海柔性结构的非线性流固耦合振动与破坏机理";2011CB013702

摘　　要：通过有限元分析方法,开展了钢管在内压和弯曲载荷联合作用下的数值仿真计算。基于临界屈曲应变的影响因素分析,确定了计算工况,建立了有限元模型,研究了径厚比、内压、钢级对临界屈曲应变的影响。根据数值计算结果,回归得到了钢管在内压和弯曲载荷作用下的临界屈曲应变的计算公式,利用Matlab回归得到了非线性系数。实物试验结果验证表明,所建立的计算公式与CSA和DNV计算公式相比,有更高的预测精度。(表3,图4,参14)This paper carries out numerical simulation calculations of steel pipe under joint action of internal strength and bending loads using finite element method （FEM）.By means of analysis on the influential factors of critical buckling strain,it determines calculating working conditions,constructs a finite element model,studies the impact of diameter/thickness ratio,internal strength and steel grade on critical buckling strain,and according to numerical calculation results,obtains nonlinear coefficient through Matlab regression to establish a critical buckling strain calculating formula of line pipes under the action of internal strength and buckling loads by regression.The physical test results verify that the established calculating formula has the higher prediction accuracy,if compared with CSA/DNV calculating formulas.

关 键 词：完好管道 数值仿真 临界屈曲应变 高强度钢 复杂载荷 

分 类 号：TE88[石油与天然气工程—油气储运工程]