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The crack propagation behavior can be tuned from unstable to stable manner without sacrificing the crack initiation during the opening mode test.
This thin crack is characterized by the lowest H * value and, thus, appears to be the best gate for vortex entry.
Thus, the engineering size crack initiation is expected to be easily detected through the analysis of the strain waveform.
These basic solutions combined with superposition method enable stress intensity factors to be rapidly determined for complex loadings, as demonstrated by example engineering crack problems.
It is revealed that the proposed simulation method can reproduce reasonably the crack initiation and propagation, and predict well the change of the mechanical behaviour due to the openings.
The developed procedures simplify the analysis of the description of mechanical fields at a greater distance from the crack tip considerably.

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