Please see this article:

Chapter 2D and 3D Multi-directional Cracked Concrete Model under Rev...

3D is as 2D.

Please see this article:

Chapter 2D and 3D Multi-directional Cracked Concrete Model under Rev...

Best of luck

Thank you Dr. Mohannad H. Al-Sherrawi

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Article Finite element modeling of quasi-brittle cracks in 2D and 3D...

Always firstly try 2D and make it work. Then do 3D.

Following work could be helpful:

[1] Finite element modelling of internal and multiple localized cracks

[2] On advanced solution strategies to overcome locking effects in strong discontinuity approaches

Thank you so much Dr.@Miguel Cervera

Thank you so much Dr.@Yiming Zhang

Following

Try working on 2D and then work later on 3D

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Article Appraisement of planar, bending and twisting cracks in 3D wi...

Thank you Miguel Cervera

thank you Abambres M.