Instabilities and pattern transformation in periodic, porous elastoplastic solid coatings

Srikanth Singamaneni, Katia Bertoldi, Sehoon Chang, Ji Hyun Jang, Edwin L. Thomas, Mary C. Boyce, Vladimir V. Tsukruk

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Pattern transformation in periodic microporous elastoplastic solid coatings is caused by a buckling of the struts and a rotation of the nodes under compressive stresses. The results of a nonlinear numerical investigation confirm the critical role of the bifurcation of the periodic solid under compressive stresses. In striking contrast to the earlier observations of elastic instabilities in porous elastomeric solids, the elastic-plastic nature of the cross-linked periodic microstructure studied here provides the ability to lock in the transformed pattern with complete relaxation of the internal stresses. The study unveils a novel deformation mode in porous periodic solids in the form of organized buckling instability of weak strut elements.

Original languageEnglish
Pages (from-to)42-47
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number1
StatePublished - Jan 28 2009


  • buckling behavior
  • interference lithography structures
  • mechanical instabilities
  • pattern transformation


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