Time-dependent creep of a dual-phase viscoplastic material with lamellar structure

J. Li, G. J. Weng

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Exact solutions for the time-dependent creep behavior of a two-phase material with a lamellar microstructure are derived as a function of volume concentration and the properties of its constituents. Each phase is taken to be elastic-viscoplastic, exhibiting work-hardening characteristics. The derivation takes advantage of the condition of interfacial discontinuities over the interfaces, with a result given in a rate form for the general combined loading. Specific overall creep strains are presented along five distinctive loading directions for two kinds of viscoplastic composites: one involving an elastic and a viscoplastic phases and the other with dual viscoplastic phases. In addition to providing insightful information for the overall time-dependent creep, the exact nature of the results can also serve as a bench mark to test the accuracy of the approximate theories. In this light a secant-viscosity approach recently developed for a particle-reinforced solid (Li, J. and Weng, G. J. (1997). A secant-viscosity approach to the time-dependent creep of an elastic-viscoplastic composite. J. Mech. Phys. Solids, 45, 1069) is extended to a lamellar structure and the results are tested against these exact solutions. Comparison between the two indicates that the secant-viscosity concept is a sufficiently accurate one and it can be applied to composites with other types of microgeometries.

Original languageEnglish (US)
Pages (from-to)755-770
Number of pages16
JournalInternational journal of plasticity
Issue number8
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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