材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
発泡ポリエチレンフィルムの圧縮変形挙動に及ぼすひずみ速度と内部流体の影響
山田 浩之立山 耕平小笠原 永久
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ジャーナル フリー

2018 年 67 巻 11 号 p. 970-976

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In order to investigate the effect of strain rate and inner fluid on deformation behavior of the formed polyethylene (PE) film, the fluid-structure interaction analysis of the cell structure was carried out using SPH (Smoothed particle hydrodynamics)-FEM (Finite element method) analysis model. The analysis model was composed of cell walls, inner fluid and rigid walls. The cell walls were meshed using shell elements, and the inner fluid was replaced with the SPH particles. Numerical simulations of the compressing behavior of the formed PE film were performed at strain rates of 5.0×100, 5.0×101 and 5.0×102 s-1. Air-filled and no-air models were prepared to investigate the effect of the inner air on the compressive properties. Even if the strain rate dependence was not defined for the constituent materials, it was confirmed that the effect of flow resistance of the residual inner fluid on the strain rate dependence of structural strength is remarkable when the internal fluid flows out. Therefore, in the quasi-static strain rate range, the strength increases due to the flow resistance of the residual inner fluid at the deformation and fracture of cell wall, which induces high strain rate sensitivity of the formed PE film. On the other hand, the increase in the strength due to the flow resistance of the residual inner fluid has reached the upper limit since the internal fluid does not flow out in the impact strain rate region. Thus, the strength of the formed PE film shows low strain rate sensitivity. From the above results, it was suggested that the deformation of the foamed PE film is influenced by the variation of flow resistance of the residual inner fluid with the strain rate.

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