Unexpected Phenomena in Multilayered Copper Subjected to Plane Strain Compression

• Gotoh Manabu

  Department of Mechanical Engineering, Gifu University

• Yamashita Minoru

  Department of Mechanical Engineering, Gifu University

• Torii Naoshi

  Hitachi Seisakusho Co., Ltd.

抄録

Pure copper rectangular blocks are simply set in a multilayered manner without bonding and compressed up to 50% reduction in height per operation in the plane strain condition. When as-received copper (Cu-H) or precompressed dead-soft copper (Cu-O) is compressed, the interfaces of such multilayered blocks turn into extremely wavy surfaces, while those of virgin Cu-O blocks remain almost flat. This phenomenon may be a kind of diffuse-type instability depending on the work-hardening property (i. e., n-value) of the material. This phenomenon appears more markedly when an aluminum sheet is inserted between the interfaces. When the interface of the two layered blocks becomes saw-toothed, its waviness after compression is reduced to a comparable extent. Furthermore, when two blocks are designed in an hourglass or barrel-type, the interface remains a little wavy with no instability for both specimens with flat and saw-toothed interfaces. The saw-teeth of the interface surprisingly grow in height and width with compression particularly in the central portion of the interface of the barrel-type two-block specimen, inducing complete bonding of the blocks. Finally, when Cu-O severely precompressed up to 87. 5% (-2.1 in log strain) is tested as 8-layered blocks, the specimen fractures along a plane oblique to the compression axis before further deformation. This phenomenon may be a kind of localized (shear band) -type instability.

収録刊行物

• JSME international journal. Ser. A, Mechanics and material engineering

  JSME international journal. Ser. A, Mechanics and material engineering 36 (2), 182-189, 1993-04-15

  一般社団法人日本機械学会

キーワード

• Plasticity
• Plastic Instability
• Formability
• Compression
• Multilayered Copper
• Bonding

詳細情報

• CRID: 1573950401924624512
• NII論文ID: 110002964289
• NII書誌ID: AA10888746
• ISSN: 09148809
• 本文言語コード: en
• データソース種別:
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