Flow/damage surfaces for fiber-reinforced metals having different periodic microstructures

Cliff J. Lissenden, Steven M. Arnold, Saiganesh K. Iyer

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Flow/damage surfaces can be defined in terms of stress, inelastic strain rate, and internal variables using a thermodynamics framework. A macroscale definition relevant to thermodynamics and usable in an experimental program is employed to map out surfaces of constant inelastic power in various stress planes. The inelastic flow of a model silicon carbide/titanium composite system having rectangular, hexagonal, and square diagonal fiber packing arrays subjected to biaxial stresses is quantified by flow/damage surfaces that are determined numerically from micromechanics, using both finite element analysis and the generalized method of cells. Residual stresses from processing are explicitly included and damage in the form of fiber-matrix debonding under transverse tensile and/or shear loading is represented by a simple interface model. The influence of microstructural architecture is largest whenever fiber-matrix debonding is not an issue; for example in the presence of transverse compressive stresses. Additionally, as the fiber volume fraction increases, so does the effect of micro- structural architecture. These results indicate that microstructural architecture needs to be accounted for in an accurate continuum model, thus complicating development of such a model. With regard to the micromechanics analysis, the overall inelastic flow predicted by the generalized method of cells is in excellent agreement with that predicted using a large number of displacement-based finite elements.

Original languageEnglish (US)
Pages (from-to)1049-1074
Number of pages26
JournalInternational journal of plasticity
Volume16
Issue number9
DOIs
StatePublished - Aug 7 2000

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Fiber reinforced metals
Microstructure
Micromechanics
Fibers
Debonding
Thermodynamics
Titanium
Compressive stress
Silicon carbide
Large scale systems
Strain rate
Residual stresses
Volume fraction
Finite element method
Processing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Flow/damage surfaces can be defined in terms of stress, inelastic strain rate, and internal variables using a thermodynamics framework. A macroscale definition relevant to thermodynamics and usable in an experimental program is employed to map out surfaces of constant inelastic power in various stress planes. The inelastic flow of a model silicon carbide/titanium composite system having rectangular, hexagonal, and square diagonal fiber packing arrays subjected to biaxial stresses is quantified by flow/damage surfaces that are determined numerically from micromechanics, using both finite element analysis and the generalized method of cells. Residual stresses from processing are explicitly included and damage in the form of fiber-matrix debonding under transverse tensile and/or shear loading is represented by a simple interface model. The influence of microstructural architecture is largest whenever fiber-matrix debonding is not an issue; for example in the presence of transverse compressive stresses. Additionally, as the fiber volume fraction increases, so does the effect of micro- structural architecture. These results indicate that microstructural architecture needs to be accounted for in an accurate continuum model, thus complicating development of such a model. With regard to the micromechanics analysis, the overall inelastic flow predicted by the generalized method of cells is in excellent agreement with that predicted using a large number of displacement-based finite elements.",
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Flow/damage surfaces for fiber-reinforced metals having different periodic microstructures. / Lissenden, Cliff J.; Arnold, Steven M.; Iyer, Saiganesh K.

In: International journal of plasticity, Vol. 16, No. 9, 07.08.2000, p. 1049-1074.

Research output: Contribution to journalArticle

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