Engineering Mechanics

Proceedings Vol. 13 (2007)

ENGINEERING MECHANICS 2007

Copyright © 2007 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

 

Veselý V., Keršner Z., Řoutil L.
pages 315 - +13p., full text

This paper is focused on fracture energy which belongs to the basic fracture-mechanical characteristics of quasi-brittle materials. This parameter is explored here from the point of view of two most frequently used non-linear approaches to modelling of quasi-brittle fracture – cohesive crack models and equivalent elastic crack models. Different expressions of energy dissipated during the fracture process, i.e. work of fracture and specific fracture energy, are investigated. The paper deals also with the influence of specimen size and testing geometry on the value of mentioned fracture characteristics. The research is conducted by means of numerical simulations of three-point bending of notched beams with several specimen sizes. The simulations or fracture tests are performed by using ATENA FEM software.

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