Analysis of cohesive crack coupled with thermoelasticity

Fibre reinforced concrete (FRC) has become an alternative for structural applications due its outstanding mechanical properties. The appearance of new types of fibres and the fibre cocktails that can be configured mixing them has created FRC that clearly exceed the minimum mechanical properties required in the standards. Consequently, in order to take full advantage of the contribution of the fibres in construction projects, it is of great interest to have constitutive models that simulate the behaviour of the materials. This study aimed to simulate the fracture behaviour of five types of FRC, three with steel hooked fibres, one with a combination of two types of steel fibres and one with a combination of polyolefin fibres and two types of steel fibres, by means of an inverse analysis based on the cohesive crack approach. The results of the numerical simulations defined the softening functions of each FRC formulation and have pointed out the synergies that are created through use of fibre cocktails. The information obtained might suppose a remarkable advance for designers using high-performance FRC in structural elements.

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Simulation of crack growth using cohesive crack method

Applied Mathematical Modelling ◽

10.1016/j.apm.2009.11.015 ◽

2010 ◽

Vol 34 (9) ◽

pp. 2508-2519 ◽

Cited By ~ 4

Author(s):

H. Zhang

Keyword(s):

Crack Growth ◽

Cohesive Crack

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Wedge-Splitting Test – Determination of Minimal Starting Notch Length for Various Cement Based Composites Part I: Cohesive Crack Modelling

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.452-453.77 ◽

2010 ◽

Vol 452-453 ◽

pp. 77-80 ◽

Cited By ~ 8

Author(s):

Václav Veselý ◽

Ladislav Řoutil ◽

Stanislav Seitl

Keyword(s):

Fracture Mechanics ◽

Cohesive Crack ◽

Crack Model ◽

Singular Stress ◽

Initiation Point ◽

Linear Elastic ◽

Wedge Splitting Test ◽

Splitting Test ◽

Notch Length ◽

Wedge Splitting

The geometric proportions of cube-shaped specimens subjected to wedge-splitting tests are numerically studied in the paper. The minimal notch length for specimens made of cement based composites varying in characteristic length of the material (a measure of material brittle-ness/heterogeneity) is verified using finite element method code with an implemented cohesive crack model (ATENA). The problem of assigning the crack initiation point (the notch tip vs. the groove corner in the load-imposing area of the specimen) is solved numerically also using both the theory of linear elastic fracture mechanics and the theory of the fracture mechanics of generalized singular stress concentrators in the second part of the two-part paper. Results ob-tained by the different approaches are compared. The minimal notch length is recommended.

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