Debonding analyses in anisotropic materials with strain- gradient effects

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Abstract

A unit cell approach is adopted to numerically analyze the effect of plastic anisotropy on damage evolution in a micro-reinforced composite. The matrix material exhibit size effects and a visco-plastic anisotropic strain gradient plasticity model accounting for such size effects is adopted. A conventional cohesive law is extended such that both the average as well as the jump in plastic strain across the fiber-matrix interface are accounted for. Results are shown for both conventional isotropic
and anisotropic materials as well as for higher order isotropic and anisotropic materials with and without debonding. Generally, the strain gradient enhanced material exhibits higher load carry capacity compared to the corresponding conventional material. A sudden stress drop occurs in the macroscopic stress-strain response curve due to fiber-matrix debonding and the results show that a change in yield stress, which is caused by plastic anisotropy, affects the overall composite failure strain.
Original languageEnglish
Title of host publicationProceedings of the 25th Nordic Seminar on Computational Mechanics
Number of pages4
PublisherLund University
Publication date2012
Publication statusPublished - 2012
EventNSCM25: 25th Nordic Seminar on Computational Mechanics - University of Lund, Lund, Sweden
Duration: 25 Oct 201226 Oct 2012

Conference

ConferenceNSCM25
LocationUniversity of Lund
Country/TerritorySweden
CityLund
Period25/10/201226/10/2012

Keywords

  • Debon
  • Plastic anisotropy
  • Strain-gradient plasticity

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