Numerical Simulations of Unexpected Phenomena in Plane Strain Compression of Multilayered Blocks
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概要
- 論文の詳細を見る
In the preceding work we encountered several peculiar phenomena in plane strain upsetting of oxide-free pure copper blocks which are set in multilayered manners without bonding. That is, the interfaces of blocks under certain experimental conditions become strongly wavy, and shear-band fracture takes place under the condition that the blocks are precompressed up to an extremely high strain. Furthermore, when two tapered blocks are set in the forms of an hourglass and a barrel, the interface in each case remains slightly wavy. In this paper, numerical simulations by means of the elastic-plastic finite element method in plane strain conditions are carried out to ascertain whether these phenomena take place by nature or due to some experimental error. The results show that in the case of 2-, 3-, and 7-layered rectangular blocks where Cu-H is assumed as the material, the wavy interface reappears, and that in the case of 2-layered rectangular blocks where Cu-O is assumed, the interface remains almost flat. When the n-value, which describes the work-hardening property of the material, is assumed to decrease in proportion to the increase of equivalent strain, the interface becomes more wavy for the higher rate of the n-value's decrease. These numerical results imply strongly that such waviness of the interfaces is due to a diffuse -type plastic instability. Next, in the simulations of the shear-band formation, we see that such a band appears more readily for a lower n-value, at which extrusion of the material in the shape of a thin sheet is also observed at the bottom portion. This result shows that such shear-band formation is due to a localized-type plastic instability. Finally, regarding the hourglass- and barrel-type specimens designed with two tapered blocks, the interface shows smaller waviness as the tapering is sharper. Based on the calculations performed here, we conclude that the previous experimental results can be well simulated numerically, and that, therefore, these unexpected phenomena may take place by nature, not due to any error in the experimental operation.
- 一般社団法人日本機械学会の論文
- 1993-07-15
著者
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Yamashita Minoru
Department Of Mechanical Engineering Gifu University
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Yamashita Minoru
Department Of Mechanical & Systems Engineering Gifu University
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Gotoh M
Gifu‐univ. Gifu Jpn
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Gotoh Manabu
Department Of Mechanical & Systems Engineering Gifu University
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Torii Naoshi
Hitachi Seisakusho Co., Ltd.
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Torii Naoshi
Hitachi Seisakusho Co. Ltd.
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