一种Z形加筋焊接壁板压缩失稳极限载荷的求取方法及有限元分析

METHOD AND FINITE ELEMENT ANALYSIS FOR THE COMPRESSION INSTABILITY ULTIMATE LOAD OF A Z-SHAPED STIFFENED-WELED PLATE

以大型Z形加筋焊接壁板为研究对象,结合理论分析和Abaqus有限元模拟研究了其压缩失稳极限载荷,为大型焊接壁板的应用提供理论支持及有限元模拟方法,节约试验成本、提高工作效率。理论部分研究了有效宽度和惯性半径之间的关系,以及当蒙皮与长桁材料不同时的平均载荷的求取方法。有限元模拟分析通过提取载荷比例因子(LPF)的极值确定壁板的极限载荷。为提高模拟的准确性,根据焊缝的强度及云图判断开焊顺序,研究开焊过程中的极限载荷的变化,确定极限载荷范围。理论值和模拟值与实验值对比验证。最后模拟分析了材料弹性模量对极限载荷的影响,由分析结果可知适当提高长桁材料的弹性模量更有利于增大整体极限载荷。

Object of study was the large Z shaped stiffened-welded plate, combined with theoretical analysis and finite element simulation of Abaqus researched the compression instability ultimate load, to provide theory and simulation for the application of large welded plate, save the test cost and improve efficiency. The theory studied the relationship between effective width and radius of inertia, calculation of the average load as skin with truss had different material. In the simulation of analysis, ultimate load was determined by extracting the extreme value of the load proportion factor （LPF）. For improving the accuracy of the simulation, according to the strength of the welding seam with the cloud image judged the welding sequence, studied on the variation of ultimate load in welding, to determine the limit load range. Theoretical and the simulation value compared with the experiment. Influence of the elastic modulus of material on the overall ultimate load was analyzed, by the result of the analysis, the modulus of the long truss material is more conductive to improve the ultimate load.