Fracture Simulations of Concrete Using Lattice Models: Computational Aspects.
Fracture Simulations of Concrete Using Lattice Models:
Schlangen, E.; Garboczi, E. J.
Engineering Fracture Mechanics, Vol. 57, No. 2/3,
concretes; lattice models
This paper addresses some lattice model techniques used
in numerical simulations of fracture in concrete and
other random materials. The influence of lattice
element type and lattice orientation on the fracture
pattern was investigated by simulating a shear loading
experiment on a concrete plate. Beam elements with
three degrees of freedom per node, and with a random
orientation of the beams within the lattice, gave the
best comparison with experiment. The effect of element
resolution on fracture results was also investigated. A
new fracture law has been developed that uses principle
tensile stresses in each ode of the lattice to determine
which beam should break at every step of a simulation.
For the implementation of heterogeneity in the model, a
method has been developed that uses digital images of
the real microstructure of a material. Simulated crack
patterns were obtained for a real material, using this
technique, which appear quite realistic.