Abstract
A nonlinear mixed mode model originally developed by Wernersson [Wernersson H. Fracture
characterization of wood adhesive joints. Report TVSM-1006, Lund University,
Division of Structural Mechanics; 1994], based on nonlinear fracture mechanics, is discussed
and applied to model interfacial cracking in a steel–concrete interface. The model
is based on the principles of Hillerborgs fictitious crack model, however, the Mode I softening
description is modified taking into account the influence of shear. The model couples
normal and shear stresses for a given combination of Mode I and II fracture. An experimental
set-up for the assessment of mixed mode interfacial fracture properties is presented,
applying a bi-material specimen, half steel and half concrete, with an inclined interface
and under uniaxial load. Loading the inclined steel–concrete interface under different
angles produces load–crack opening curves, which may be interpreted using the nonlinear
mixed mode model. The interpretation of test results is carried out in a two step inverse
analysis applying numerical optimization tools. It is demonstrated how to perform the
inverse analysis, which couples the assumed individual experimental load–crack opening
curves. The individual load–crack opening curves are obtained under different combinations
of normal and shear stresses. Reliable results are obtained in pure Mode I, whereas
experimental data for small mixed mode angles are used to extrapolate the pure Mode II
curve.
Original language | English |
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Journal | Engineering Fracture Mechanics |
Volume | 75 |
Issue number | 18 |
Pages (from-to) | 5163-5176 |
ISSN | 0013-7944 |
DOIs | |
Publication status | Published - 2008 |
Keywords
- Steel–concrete interface
- Nonlinear fracture mechanics
- Mixed mode fracture