加筋复合材料夹层板强度子模型分析方法研究

Sub-model analysis method on strength of reinforced composite sandwich plate

[目的]旨在解决全局模型壳、体单元混合边界位移在子模型驱动边界上的转换加载问题。[方法]首先,以加筋复合材料夹层板为研究对象,运用Python语言对ABAQUS进行二次开发,编写边界位移的插值程序,以实现壳、体混合边界节点自由度向子模型驱动边界上的转换;然后,通过对比子模型与全局模型之间的应力、位移云图,以及各路径上的应力、位移变化曲线,验证所提出方法的正确性。[结果]结果显示,全局模型在子模型区域的位移、应力云图与子模型基本一致,子模型与全局粗网格模型的位移完全重合,应力变化趋势一致;子模型与全局细网格模型的应力误差最大不超过12.5%。[结论]所做工作可为子模型方法的应用提供参考。

[Objectives]This study aims to transform the displacement components from the cutting boundary of a global model modeled with shell and solid to the driven boundary of a submodel modeled with solid.[Methods]First, taking a reinforced composite sandwich plate as the subject, the secondary development of ABAQUS is carried out using Python. In writing the linear interpolation program, the node degree of freedom is transformed from the shell-solid-mixed boundary to the driven boundary of the submodel. The correctness of the proposed method is then verified by comparing the stress contours, displacement contour plots and stress and displacement curves along each path between the global model and submodel.[Results]In the submodel region, the displacement and stress contours of the two global models with coarse mesh and fine mesh are consistent with those of the submodel. The displacement of the submodel completely coincides with that of the cutting boundary of the global coarse model, and the trends of the stress curves along each path are the same. The stress error is less than 12.5% between the submodel and global fine model. [Conclusion]The method presented in this paper provides references for the application of submodels.