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DEFAULT : Fracture mechanics as applied to composite materials such as concrete
12.02.2013 22:09 (2704 x gelesen)

Fracture mechanics as applied to composite materials such as concrete



Crack formation in concrete can be described by non-linear fracture mechanics. It has been shown that the fracture energy depends on the ligament length. Fracture energy decreases when the crack approaches the boundary of a specimen. Based on this concept size effect of concrete structural elements can be predicted in a realistic way.

Concrete strength depends on the effective surface energy of the composite material. Depending n the composition of the pore solution the surface energy changes. The influence of this change on fracture energy is investigated. One major goal is to predict the influence of sea water on fracture energy and strength.

 

Relevant publications:

  1. J. Chen, H. Yuan, and F. H. Wittmann, Computational analysis of the size effect in concrete fracture using gradient plasticity, Proc. 5th Int. Conf. Fracture Mechanics of Concrete Structures (FRAMCOS-5), V. C. Li, C. K.Y. Leung, K. J. Willam and S. L. Billington, editors, pp. 181-188 (2004)
  2. K. Duan, X. Z. Hu, and F. H. Wittmann, Boundary effect on specific fracture energy of concrete, Proc. 5th Int. Conf. Fracture Mechanics of Concrete Structures (FRAMCOS-5), V. C. Li, C. K.Y. Leung, K. J. Willam and S. L. Billington, editors, pp. 205-212 (2004)
  3. H. Yuan and F. H. Wittmann, Size-dependent fracture energy correlated with the crack tip stress fields in concrete-like materials, Proc. 2nd Int. Symposium on Continuous and Discontinuous Modelling of Cohesive Frictional Materials (CDM 2004), A. A. Balkema Publishers, 423-434 (2004)


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