Hi Vahid,

Check this article:

https://www.researchgate.net/profile/Rashid_Abu_Al-Rub/publication/222687257_A_plasticity_and_anisotropic_damage_model_for_plain_concrete/links/09e4150e8502601984000000.pdf

Article A plasticity and anisotropic damage model for plain concrete

hi mohammad reza

I appreciate for your great paper which you shared

but in this article I couldn't find my answer which is way to modeling pinching effect in abaqus

beside lots of study shows that damaged plasticity material couldn't be able to model pinching effect properly, cause there is no proper material to model this behavior in abaqus I change software a long time age

so I tested TNO DIANA software which has excellent brittle crack model but I encountered to lack of available work study on concrete in this great software

so again I decide to change software to LS-DYNA because of this video 

and I'm working on it right now

https://www.youtube.com/watch?v=-TD5DWH8DxM

abaqus can't model pinching effect cause the only material which could model dynamic effect is CDP for concrete and its codding is not good for pinching effect read this artical: Peter Grassl , Milan Jirasek, "Damage-plastic model for concrete failure," International Journal of Solids and Structures, vol. 43, p. 7166–7196, 2006.

but ansys has good one

sincerely vahid nazari