Fig.2 The load-displacement curve
for the I-shaped specimen. Contour
plots of the fracture phase field at various stages
5.3 Single-edge notched
specimen
This is the most common benchmark test used in the verification of the
phase-field fracture models. The single-edge notched test is
investigated in detail, both experimentally and
numerically.48-51 The same investigation performed to
compare predictions of the proposed phase-field model with the
aforementioned results. Firstly, the specimen is subjected to the
tensile load, where the effect of n parameter is considered.
Afterward, the specimen is subjected to the shear load, where the
proposed model is tested with the two different values of the \(n\).
Loading is applied by \(\Delta u=\ 10e-3\ \)mm for 1000 steps.
5.3.1 Single-edge notched tension
test
The boundary conditions used in this example are shown in Table 3-II.
The specimen domain is discretized by \(10455\) finite elements.
Fig.3 depicts the crack phase-field at several stages. In the
illustrated Single-edge notched tension test the crack propagates
horizontally. A phenomenon that is observed in the simulation is that
the phase-field evolution takes place mainly in front of the crack tip
which results in stable crack propagation. The crack pattern is in
agreement with both the works of Miehe et al . and Ambati et
al .52,48,15 The force-displacement curves in Fig.4
exhibiting ductile behavior.