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- 2018
考虑制造因素的变刚度层合板的抗屈曲铺层优化设计
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Abstract:
与常规层合板相比，变刚度层合板的制造、有限元建模分析和铺层设计有其特殊之处。首先对设计时需考虑的制造因素进行了归纳，提出了变刚度层合板的铺层设计要求。然后给出了变刚度层合板的理想模型和考虑丝束宽度模型的建模方法。基于理想模型对ABAQUS的前处理模块进行二次开发，利用编制的参数化建模程序分析了不同铺放角的变刚度层合板的屈曲性能，并讨论了最小曲率半径对铺层的限制和变刚度设计提高屈曲载荷的机制。基于变刚度层合板的抗屈曲机制建立了一种铺层优化设计方法，使用遗传算法经两步优化得到最优铺层。对最优铺层建立考虑丝束宽度的模型以研究丝束宽度和铺层偏移对变刚度层合板抗屈曲铺层优化结果的影响。研究表明，在变刚度层合板的抗屈曲铺层优化中使用简化的理想模型通常来说是可行的。在考虑制造因素的情况下，优化后的变刚度层合板较常规层合板屈曲载荷有显著提高。 There are some special issues in manufacturing, modeling and layup optimization for maximum buckling load of variable-stiffness composite laminates compared with traditional ones. Firstly, the manufacturing factors which need to be considered when designing variable-stiffness laminates were summarized and the design requirements for buckling were proposed. Secondly, two modelling methods were developed, namely the ideal model and the model considering the tow width. An automatic parametric modeling program was written based on the secondary development of ABAQUS. Buckling analysis was carried on a series of variable-stiffness plates with different ply angles, and the restriction of the minimum curvature radius was discussed and the reasons for the increase in the buckling performance of variable-stiffness laminates were explained. Based on the mechanism of increasing buckling load, a layup optimization method to maximize the buckling load of variable-stiffness laminates was created and the optimum layup was obtained using a two-step genetic algorithm. Finally, the tow width and ply staggering effects on the layup optimization for maximum buckling load were investigated using the model considering the tow width. The result demonstrates that it is generally feasible to apply the simplified ideal model when carrying out the layup optimization for maximum buckling load of variable-stiffness laminates. Considering the manufacturing factors, the optimum variable-stiffness plate increases the buckling load dramatically compared with the traditional one. 江苏高校优势学科建设工程项目；国家自然科学基金（11572152）
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