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Modelling of bi-layer system of slabs using ABAQUS.
Hi everyone,
I am working on a project which deals with the bi-
layer system of slabs(i.e., two layers of different concretes bonded
together with a cement grout). The only loading case is the
temperature, i.e, due to the high room temperature different
concretes will conduct different temperatures and due to which the
stresses are developed and hence due to warping the edge curling and
delaminations occur.
My questions are;
1. what are the bond properties required to input in the abaqus?.
2. I am measuring the strains and temperatures in both the concretes
for every one hour. Can i input these strains and temperatures as a
loading conditions directly by using ABAQUS 6.5, if possible how can
i do that? or do i need to write any subroutine for inputting this
data such as UEXPAN?
3. i am conducting experiments to know the tensile strength (MODE
I), compressive strength, modulus of elasticity, slant shear (which
gives MODE II value). Will these results be helpful to define the
bond properties?
Can anyone please reply to me, so that i can proceed with my work.
Thank you very much,
Sathish.Konduru.
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Your questions: 1 . What
Your questions:
1 . What about Tie?
2. You can add boundary condition like displacement and temperature.
3. Yes.
modelling o a bi-layer system
Kewei,
Thank you very much, can you explain me in a detail please..
Sathish.
Dear Sathish: Before I am
Dear Sathish:
Before I am going ahead, I need some more information about your model, say geometry features, boundary condition, position of load, and so on, lack of this informaiton, it is hard to give you more constructive suggestions. Thanks
Modelling of Bi-layer system.
thank you...here is the information of my slabs..
dimensions: 6ft X 8ft X6.5 substrate and 6ft X 8ft X 2in Overlay on top of the substrate.
Materials: Substrate-Normal concrete and Overlay-Latex-modified Concrete(LMC).
The Bi-layer system is resting on the ground.
The slab is enclosed in a chamber, which is used for providing
heat (around 95 deg F) and the humidity(around 45%). The only
loading case is due to temperature and the humidity. i have the
temperature and humidity data recorded for every 1 hr.
I
installed the thermocouples and strain gages in both the concretes to
record the temperatures and strains due to the applied heat and
humidity for every 1hr.
I hope this information will give you some idea.
Thank you very much...eagerly waitning for your reply.
sathish.konduru
Dear Sathish: Comparing
Dear Sathish:
Comparing with the substate of your model, the Overlay is just 2 inch. So you can model this feature with the Skin function of ABAQUS. The substate is the bulk material and the overlay is the skin. A alternative method is to use Tie constraint between substate and Overlay, by which you can bond the two lays together. For the two materials, you need input the mechanical and thermal properties to ABAQUS which means your experiments for the temperature-dependent strain, compressive strength, modulus of elasticity, etc. are really helpful to conduct this simulation with ABAQUS.
Good luck with your research! Hope it is helpful!
Dear Kewei,
Thank you very much for your valuable suggestions.
I am not familiar with using the tie constraint and inputting the thermal-dependant strain in the ABAQUS. I don't even know about the skin function. can you help me ragarding this issue.
Thank you very much. i appreciate your help.
Hi, Sathish:
Hi, Sathish:
You need, it seems, basic understanding of ABAQUS simulation. If you are new with ABAQUS. You had better get start with Getting Started with ABAQUS. To use the Tie constraint and Skin in your simulation with ABAQUS/CAE, please refer to Section 15.14.1 Defining tie constraints and Section 20.3.1 Defining skin reinforcements of AQUS/CAE User's Manual. See Part V: Materials of ABAQUS Analysis User's Manual for details about the definition of material.
Good luck!
hi kewei,
Thank you for your suggestions.
Actually this is my first project on ABAQUS, i went through the ABAQUS
CAE material and some examples manual. But i was not sure of this
special kind of problem , i.e., how to input the thermal strains
with time, thats why i asked you the very basic question i am sorry for
that.
thank you
sathish.k
I am sorry, Sathish. I have
I am sorry, Sathish. I have no experience on how to input this kind of data to ABAQUS.
Good luck with your project!