Rate-sensitive damage theory for brittle solids

Wimal Suaris, Surendra P. Shah

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


A continuous damage theory is presented for the quasi-static and dynamic behavior of brittle materials. Considering flat microcracks a vectorial representation is adopted for the damage variable. A free energy function dependent on the coupled invariants of strain and damage is postulated, and the constitutive equations and the damage evolution equations are derived consistently subject to thermodynamic restrictions. The stress-strain curves for uniaxial tension and compression resulting from the theory are compared with available experimental results for concrete. A decrease in the nonlinearity of the stress-strain curves is observed as the strain-rate is increased. A higher stress-strain sensitivity in tension, as compared to compression, is also predicted.

Original languageEnglish (US)
Pages (from-to)985-997
Number of pages13
JournalJournal of Engineering Mechanics
Issue number6
StatePublished - Jun 1984

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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