基于子程序二次开发的双向曲率板应变分布计算方法

Subroutine-based calculation method for strain distribution of bidirectional curvature plates

[目的]在船舶双向曲率板的自动化成型研究中,板材的面内应变和面外应变分布计算方法是一个重要问题。针对现有应变计算方法存在的局限性,提出一种提高船舶双向曲率板应变分布计算精度的方法。[方法]以圆形平板为研究对象,在有限元软件中进行子程序的二次开发,逐步施加位移场载荷,提高应变分布的计算精度;考虑到实际加工过程是弹塑性变形的过程,因此讨论材料非线性对应变分布的影响;从计算精度和计算效率的角度,讨论各种计算方法的适用性。[结果]子程序计算方法解决了现有方法计算精度不足、建模复杂和计算效率低下的问题;考虑到计算效率,建议使用弹性大变形有限元方法来计算应变;针对不同曲率半径的目标形状,对计算方法的选取给出了合理的建议。[结论]研究成果可为船舶双向曲率板的自动化成型系统提供准确的应变分布,具有实际的工程应用价值。

[Objectives]In research on the automatic forming of ship bidirectional curvature plates,the calculation method of in-plane strain and out-of-plane strain distribution is an important problem.In light of the limitations of existing methods of calculating strain,a new method is proposed that can improve the calculation accuracy of the strain distribution of ship bidirectional curvature plates.The new method has high calculation efficiency and meets the needs of engineering applications.[Methods]Taking a circular flat plate as the research object,the secondary development of a subroutine in finite element software is carried out,and the displacement field load is gradually applied,improving the accuracy of strain distribution calculation.Considering that the actual machining process is an elastoplastic deformation process,the influence of material nonlinearity on strain distribution is discussed.From the perspective of calculation accuracy and efficiency,the applicability of various calculation methods is discussed.[Results]The subroutine-based calculation method solves the problems of insufficient precision,complex modeling and low calculation efficiency of existing methods.From the perspective of calculation efficiency,it is recommended to use the elastic large deformation finite element method to calculate the strain.For target shapes with different curvature radii,several reasonable suggestions are given for the selection of calculation method.[Conclusions]The proposed method can quickly provide accurate strain distribution calculations for the automatic forming systems of ship bidirectional curvature plates,giving it practical engineering application value.