Multiphase material optimization for fiber reinforced composites with strain softening

Junji Kato, Andreas Lipka, Ekkehard Ramm

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


The present paper addresses an optimization strategy of textile fiber reinforced concrete (FRC) with emphasis on its special failure behavior. Since both concrete and fiber are brittle materials a prominent objective for FRC structures is concerned with the improvement of ductility. Despite above unfavorable characteristics the interface between fiber and matrix plays a substantial role in the structural response. This favorable 'composite effect' is related to material parameters involved in the interface and the material layout on the small scale level. Therefore the purpose of the present paper is to improve the structural ductility of FRC at the macroscopic level applying an optimization method with respect to significant material parameters at the small scale level. The method discussed is based on multiphase material optimization. This methodology is extended to a damage formulation. The performance of the proposed method is demonstrated in a series of numerical examples; it is verified that the ductility can considerably be improved.

Original languageEnglish
Pages (from-to)63-81
Number of pages19
JournalStructural and Multidisciplinary Optimization
Issue number1
Publication statusPublished - 2009 Jul 1


  • Fiber reinforced composites
  • Material nonlinearity
  • Multiphase material optimization

ASJC Scopus subject areas

  • Software
  • Control and Systems Engineering
  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Control and Optimization


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