How can I simulate a cube concrete reinforced randomly with date palm fibers using Abaqus?
The material can be considered isotropic. The elastic properties depend on the elastic properties of the constituent phases (concrete and palm fibers), the volume fraction of fibers and the fibers' aspect ratio. The elastic properties homogeneization can be calculated by classical phenomenological theories. From the Halpin -Tsai eq. one can calculate E11 and E22. The modulus of the random composite, Er ,is approximately given by:
Er=3/8 E11+5/8 E22.
E11 and E22 are the lungitudinal and transverse moduli of a virtual unidirectional composite with the same volume fraction of fibres.
The strength is related to the elastic properties by classical empirical formulae that can be found in the textbooks of concrete science.
Hello Abdelmajeed Altlomate,
you can indeed use the Digimat-FE module to generate an RVE which will contain all the information regarding the material properties of both phases, i.e. matrix and inclusions.
You then can run a finite element simulation with the RVE alone in order to obtain the homogenized properties and then use them for an isotropic material in Abaqus. (The RVE geometry can be exported in the Abaqus format with all the material properties written along)
Or, you can create a coupled analysis between Digimat-CAE and Abaqus. What will happen is that Digimat will be seen as your UMAT in Abaqus and thus will compute for you the stresses at integration points based the strains passed by Abaqus. The stress increment at a given integration point will be based on the homogenized behavior which will be computed by Digimat either in the pre-processing phase for all orientations etc.. or in real-time at each time step. It is up to you to make the choice at this point.
I hope that this information will help you in your work.
Hello,
I am working in nanocomposites and trying to use digimat and abaqus but i am unable to interface these two.The abaqus has digimat plugin to import material from digimat but for some reason it does not work. Can you elaborate the procedure to use abaqus and Digimat-MF,FE or CAE.
Thank you
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