Dear community,
for my master’s thesis I’ve been using the "Damage Evolution Law" feature available in ANSYS to calculate the failure behavior of FRP composite structures using FEM simulation. Within the Damage Evolution Law, two different options are available:
- Material Property Degradation
- Continuum Damage Mechanics
Right now I’m trying to figure out on which theoretical approach the two models are based. Could you provide a reference to the research papers in which the respective approaches were developed? Unfortunately, I could not find such a bibliography in either the Theory Reference or the Material Reference.
Many thanks in advance.
1) Material Property degradation is based on stiffness degradation. in this case, you will have to provide the ratio of stiffness at which material fails to original stiffness of the material. The same method is also used for defining damage evolution in ABAQUS. You will get plenty of examples in that regard. In material damage degradation, we are specifying nothing but degradation in stiffness of the material responsible for failure.
2) Continuum damage is the energy-based approach. in case of brittle materials, the energy required for the formation of new surface needs to be specified. other than brittle material, you have to be careful as it will also involve terms of dissipating energy. Examples regarding this approach can be easily found in ABAQUS tutorial.
Thanks and regards,
Sachin
Thank you for your response. Im looking for a refference papers for both methods and i cant find in the Ansys Manual. Do you know the papers that each of these methods based?
Hello,
Well, in the 3D- FRP composite structures we use 3D- Hashin failure criterion and etc. for damage initiation and energy-based approaches fo damage evaluation. And to investigate delamination, we use an element or surface-based cohesive zone method that depends on the traction- separation law, between each layer.
in the field of damage evaluation in laminated composite, you need to search for articles on the subject of ((progressive failure of the laminated composite)).
For example ((Simulating progressive failure of composite laminates including in-ply and delamination damage effects)).
https://www.sciencedirect.com/science/article/abs/pii/S1359835X14000530
Also, The following books will be useful in this field:
- ((MODELING THE EFFECT OF DAMAGE IN COMPOSITE STRUCTURES))
Book Modeling the Effect of Damage in Composite Structures: Simpl...
- ((Mechanical Response of Composites))
Book Mechanical Response of Composites
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