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内圧によるベローズの座屈後張出し変形挙動の解析手法の検討

Study on analysis methods of post-buckling bulging deformation behavior of bellows subjected to internal pressure

月森 和之; 安藤 勝訓; 矢田 浩基; 荒川 学*; 北川 敬太*

Tsukimori, Kazuyuki; Ando, Masanori; Yada, Hiroki; Arakawa, Manabu*; Kitagawa, Keita*

比較的山数の少ない液圧成形ベローズに内圧を負荷していくと、まずインプレーンスクワームと呼ばれる座屈を生じ、その後隣接する山同士が接触し、次第に谷部が外に張出し、ついには全体が張出す。過酷事象の際は座屈後どこまでバウンダリ機能が維持されるかが問われる。座屈まではFEM大変形解析で解析可能であるが、山間の接触が進むと収束解を得ることが非常に困難となる。本研究では、端部を移動させることで接触を回避する方法及び陽解法を準静的に用いる解析により、終局変形を求めることを試み、実際の変形形状と比較検討した。

Bellows with relatively small number of convolutions yields so called in-plane squirm due to over internal pressure. However, still its boundary function is maintained and bulging deformation lasts with increase of pressure until burst occurs. The seamless FEM analysis from in-plane squirm to final bulging becomes very difficult, since many contacts between convolutions occur during this process. In this study to avoid this difficulty, two analysis methods, i.e., implicit analysis with artificially moving bellows end and quasi-static explicit analysis, were tried and their results were discussed compared with experimental results.

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