含孔CFRP方管的仿真模型及孔参数优化

建立了含孔碳纤维增强复合材料(Carbon Fiber Reinforced Plastic,简称"CFRP")管件的仿真模型,并对孔参数进行了多目标优化。首先研究建立了含孔CFRP管件的自由网格、映射网格和混合网格三种网格模型,对其计算效率和计算精度进行了比较,发现混合网格模型较适合于含孔结构仿真。其次建立了目标函数与孔参数之间的响应面模型,分析了孔径、孔横向位置参数、孔高度位置参数对响应的影响,发现孔径影响最大。最后采用多目标优化方法对含孔CFRP管件的孔参数进行了优化,当孔直径、孔中心高度比和孔横向偏移比三个设计变量分别取为8.98 mm、0.8、0.43时性能最优,比吸能和峰值力比初始模型分别提高了69.5%和3.6%。文中研究的仿真模型及孔参数优化方法对开展含孔复合材料结构设计具有指导意义。

SIMULATION TECHNOLOGY AND HOLE PARAMETERS OPTIMIZATIONOF PERFORATED SQUARE CFRP TUBES

This paper aims to optimize the mechanical properties of perforated square CFRP tubes by finite element analysis.The failure mode,which cannot be observed in the experiment exactly,is analyzed by microscopic process.Mixed mesh for perforated tube,which considered as the best partitioning method,got a better computational efficiency and computational accuracy compared to free mesh and radial mesh.A response surface model of two objective functions and hole parameter was built and it is found that the radius of hole has the largest effect on the two responses.Finally,an optimum solution was obtained by multi-objective optimization,where the three design variables,the radius of the hole,height of the hole and the translation of the hole in cross range,are 8.98 mm,0.80 and 0.43,respectively.And the improvement of 69.5％ in SEA and a few sacrifices of 3.6％ in peak load are achieved.The simulation model and optimization method in this paper are of guiding significance for designing CFRP perforated structured.