Zeeshan Ahmad, The model you have developed shows a sudden decrease in fracture energy without any softening, which could be due to two possible reasons. Firstly, there might be issues with the material definitions. Secondly, the current Cohesive Zone Model (CZM) may be the primary cause of the abrupt energy release. Unfortunately, the current CZM (That you are defining, lack complete bond failure mechanism to deterioration level) cannot handle failure, leading to this abrupt energy release. To stabilize the model, you may introduce artificial damping (Only if you are sure, the CZM you are using is correct in all aspect). However, this approach distorts the energy response. In other words, while artificial damping may help stabilize the model, it alters the energy response in a way that may not accurately represent the material behavior.

Thank you very much for the valuable guidelines. So it means that's one of the limitation of numerical modelling

Zeeshan Ahmad, you might be missing some parameters to define inside the numerical model. The issue you are facing is not hard to achieve with some adjustments.

Can you guide how to enter the values in this table, same for friction angle also. Any literature to get guidance from

I found in coulomb friction parameters although not compulsory by the software to enter but for our results we might add the info

DIANA FEA (Finite Element Analysis) is a software tool used for structural analysis and design. To model an infill wall in DIANA FEA, you typically follow these general steps:

Remember that the specific steps and options may vary based on the version of DIANA FEA you are using, so it's crucial to refer to the software's documentation for detailed guidance. Additionally, consulting with structural engineering principles and considering the relevant design codes and standards is important when modeling and analyzing structural elements such as infill walls.

thank you very much for the guideance

Zeeshan Ahmad, well, converting the traction-separation curve to determine the stiffness parameters for bond strength is a valid approach here in this case. If you have traction separation curve (Something useful you may find in the ABAQUS/CAE documentation, link: https://classes.engineering.wustl.edu/2009/spring/mase5513/abaqus/docs/v6.6/books/usb/default.htm?startat=pt06ch26s05alm43.html ), and with interpreting it in Engineering mechanics, you can convert that curve for the pullout test to determine the stiffness parameters for bond strength and then use it in these tables. Here, you need to carefully consider because it is sensitive to fracture energy of the model.