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 language||English (US)|
|Number of pages||13|
|Journal||Journal of Engineering Mechanics|
|State||Published - Jun 1984|
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering