Hi Dan,
Thank you for your response.
I have done modeling with a perfect bond and I got the results from this behaviour.
Now I wanted to model the debonding behavior using cohesive elements. Iam bit confused about selecting the contact area to be assigned as cohesive elements. For instance, I have 2 different materials in the model, concrete and FRP. Which material's element that I need to assigned as cohesive, is it concrete or FRP or both of them which are in contact to each other?
Perhaps, do I need to create another new layer in between concrete and FRP and assigned this new layer as cohesive elements?
Do you think it is appropriate to set this cohesive element during the initial step of loading or is it better to apply this traction separation behaviour at a suitable step, i.e. when the concrete begins to crack?
Lastly, I have chosen to use Maxs Damage option as the damage property, where can I get the data for Nominal stress(Normal-only), first direction and second direction?
________________________________
From: danmilligan2000 <***@hotmail.com>
To: ***@yahoogroups.com
Sent: Thursday, 27 October 2011, 15:45
Subject: [Abaqus] Re: Modelling Interface between concrete and FRP
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Which direction you want to pursue depends on how you want the interface to behave and what information you would like to extract about the interface. A simple tie constraint between the two surfaces may be sufficient. This simulates a perfect bond and does not allow the two surfaces to translate relative to each other. If the interface behavior is critical to your analysis, especially if you want to simulate the debond of the interface, then cohesive elements would be my choice. Knn/Kss/Ktt are the stiffnesses in the normal and two tangential directions. The stiffness can be estimated based upon the modulus of the bonding material but typically some type of experimental correlation is required to determine the exact numbers to use. Often these values are taken from coupon testing of the bonding material such as a peel test for the normal stiffness and a lap joint test for the shear dominated stiffness.
Regards,
-Dan, Firehole Composites
Post by kaizen.motoDear all,
I have difficulty to model the interface between the bottom concrete slab surface and the top FRP surface. I am trying to find out the suitable element type, the property of this element and the steps involved to simulate the behaviour of the interface.
I have tried to look at this options on contact property: Traction-separation behaviour, but I have no idea how to determine the values of Knn, Kss and Ktt? Spring elements or cohesive elements?
Please help me to solve this problems.
Thanks in advance for any kind help.
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