熱成形におけるテキスタイルコンポジットチューブのFEM変形解析

概要

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Finite element simulation of advanced textile composite tubes with a real fabric braid structure was carried out in order to assess the deformation mechanism and behavior in thermoforming processes. A commercially available explicit dynamic three-dimensional finite element code, LS-DYNA, was used for the analysis. Free bulge forming with only axial compression, cylindrical and spherical shape bulge forming processes combined with internal pressure are simulated. Comparison of the simulation results with experimental results has been made, and the results imply that the FEM model is effective to investigate deformation behavior of the textile composite tubes in thermoforming process. Effect of loading path between axial compression and internal pressure on bulged profile is also studied and it is pointed out that combination loading with internal pressure is significantly important to obtain the desired shape and quality of products. Furthermore, slipping behavior between the yarns, on which a simple geometrical model (Trellis effect) is impossible to predict in substance, can be confirmed and assessed from the FEM simulation. From the results, it is seen that the slipping is important forming mechanism and should be considered.
社団法人日本機械学会の論文
2000-08-25