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meshing at crack tip region( trapezoidal crack)

meshing at crack tip region( trapezoidal crack)

meshing at crack tip region( trapezoidal crack)

(OP)
hi
Iam trying to create an axial trapezoidal crack in a tube, i have created a quarter model and applied symmetry boundary conditions. i have partitioned the tube in order to get fine mesh at the crack tip.
wen i try to sweep mesh at the crack tip, it shows 'the region in magenta cannot be meshed with assigned elements shapes. iam using C3D20R elements, wedge at the crack tip and hex in other regions.
Is there any other method to mesh at the crack tip region ?
Any other method to create trapezoidal crack?
how to resolve this? please help

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