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The end result is useful in engineering applications predicting the strength of the element corresponding to the unstable brittle crack propagation in such innovative materials.
The resultant FE solution with a symmetrical stiffness matrix, having the singularity effect of imbedded cracks in IEs, is required only for solving multiple crack problems.
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.
We can conclude that it is possible to lead a mechanical analysis until the limits of the sample and even during the appearance and the propagation of a crack.
The case studies show how the crack initiation angle can be reasonably estimated with this methodology and how this approach provides realistic values of fracture toughness KIC and fracture energy Gf.
A problem with this approach can be in determining how much the crack initiation and propagation is due to the strong transient forces relative to the bending or other dynamic loading.
Therefore, it cannot sufficiently reflect the mechanical behaviour surrounding the crack.
The developed procedures simplify the analysis of the description of mechanical fields at a greater distance from the crack tip considerably.
The authors identify high applied stress levels in combination with potential multiple crack initiation as the probable root of the problem and propose a scheme how the model can be extended for taking into account crack initiation.