Rationalization of Plastically-Accommodated Steady-State Creep of a Composite

• Sato Eiichi

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• Kawabata Kenshi

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• Kitazono Koichi

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• Kuribayashi Kazuhiko

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

Abstract

Composite creep deformation was analyzed, based on a continuum plasticity representation of the matrix, in an ideal composite at high temperatures in the case of negligible interfacial diffusion and sliding. A general formula of the steady-state creep strain rate was derived for a composite consisting of an ellipsoidal rigid reinforcement and a creeping matrix with a stress exponent of one. A closed-form solution was then derived for a composite with a cylindrical reinforcement under pure shear deformation in a two-dimensional analysis. The resultant creep deformation satisfies the requirements of impotency, volume conservation and interfacial continuity. Traces of two types of edge dislocations were analytically drawn; they show that dislocations climb over the reinforcement, retaining no dislocations either in the matrix or at the interface. Also, two types of dislocations simultaneously climb up and down at any portion in the matrix through dislocation core shuffling without long-distance diffusion. Finally, it was concluded that plastically-accommodated creep is characterized by two types of dislocations that simultaneously climb over a reinforcement, generating a heterogeneous creep strain increment without long-distance diffusion.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 45 (7), 2295-2303, 2004

  The Japan Institute of Metals and Materials

Keywords

• composite
• inclusion-bearing material
• steady-state creep
• plastic accommodation
• dislocation creep
• inhomogeneous flow
• micromechanics

Details

• CRID: 1390001204250391296
• NII Article ID: 10013337363
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.45.2295
• COI: 1:CAS:528:DC%2BD2cXmvFejt78%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 7016006
• Web Site: http://id.nii.ac.jp/1696/00024435/
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7016006
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/45/7/45_7_2295/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed