[Abaqus] Fracture energy for hashin damage

[Moeen Saeed [e-mail] [Abaqus]]

Hi,


I need to clarify what values should one need to use in the damage evolution part of the hashin damage criteria? i.e the Longitudinal tensile and compressive fracture energy and transverse tensile and compressive fracture energy?
I have a experimental stress strain curve for all four cases (i.e longitudinal comp and tension and transverse comp and tension)
Can I simple take the area under the curve and insert under damage evolution using this relation?


E = œ*stress*strain?


Or do I also need to take into account the characteristic length? Can someone clarify this with the right equation?


Moeen




[Non-text portions of this message have been removed]

[Shreyas Joglekar [e-mail] [Abaqus]]

Hello


The area under that curve would not be helpful since you are not
considering crack propagation.


You need to conduct different experiments to find out fracture energy
parameters.
(Compact Compression and Compact Tension Specimen)


Depending upon the material you are using, you can use the standard values
reported in literature.
For my simulation in Abaqus with Hashin damage, I used values reported
in *"Fracture
toughness of the tensile and compressive fibre failure modes in laminated
composites" *by Pinho, Robinson, Iannucci (Composite Science and Technology
2006) for carbon-epoxy composites.


Good luck