Direct In Situ Observation of Deformation Modes in Wedge Indentation of Metals

• Udupa Anirudh

  Center for Materials Processing and Tribology

• Sundaram Narayan

  Department of Civil Engineering, Indian Institute of Science

• Sugihara Tatsuya

  Department of Mechanical Engineering, Osaka University

• Chandrasekar Srinivasan

  Center for Materials Processing and Tribology

書誌事項

タイトル別名

• Direct <i>In Situ</i> Observation of Deformation Modes in Wedge Indentation of Metals

抄録

We study deformation patterns in wedge indentation of annealed metals (e.g., copper) using high-resolution, in situ imaging and image correlation. Based on attributes of the deformation such as velocity fields, grid distortion and strain distributions, we discriminate between two modes of deformation — a cutting mode with narrow-angle (sharp) wedges, e.g., apex angle of 30°, and a radial-compression mode with wide-angle (blunt) wedges, e.g. apex angle of 120°. The cutting mode is characterized by significant material flow parallel to the wedge face; and a thin region of very high strain (∼3), that is located immediately adjacent to the indenter face (wall-layer), and arises from friction-induced deformation. The radial-compression mode is distinguished by material flow normal to and away from the indenter face, with negligible velocity component parallel to the indenter face. The corresponding strain field is one of bulk deformation, with the highly-strained region (strain ∼1) being of semicircular shape that extends from near the edge of indenter contact at the specimen surface, to well below the indenter tip. The observations show that indenter wall friction is likely to have a major influence on the deformation field only with narrow-angle indenters. Based on the observations of material flow, a suggestion is made (and validated) as to how the challenges faced in computational modeling of narrow-angle wedge indentation can be overcome. Implications for use of narrow-angle wedge indentation to study tribology of metalworking contacts, and ductile failure and damage in metals, are briefly discussed.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 60 (8), 1442-1449, 2019-08-01

  公益社団法人 日本金属学会

キーワード

• metals
• indentation
• high-speed imaging
• deformation
• plasticity
• cutting

詳細情報

• CRID: 1390282763131044608
• NII論文ID: 130007683568
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.md201906
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 029819181
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I029819181
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/60/8/60_MD201906/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可